Review event logs and error codes to troubleshoot issues with Microsoft Defender Antivirus

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If you encounter a problem with Microsoft Defender Antivirus, you can search the tables in this topic to find a matching issue and potential solution.

The tables list:

 Tip

You can also visit the Microsoft Defender for Endpoint demo website at demo.wd.microsoft.com to confirm the following features are working:

  • Cloud-delivered protection
  • Fast learning (including Block at first sight)
  • Potentially unwanted application blocking

Microsoft Defender Antivirus event IDs

Microsoft Defender Antivirus records event IDs in the Windows event log.

You can directly view the event log, or if you have a third-party security information and event management (SIEM) tool, you can also consume Microsoft Defender Antivirus client event IDs to review specific events and errors from your endpoints.

The table in this section lists the main Microsoft Defender Antivirus event IDs and, where possible, provides suggested solutions to fix or resolve the error.

To view a Microsoft Defender Antivirus event

  1. Open Event Viewer.
  2. In the console tree, expand Applications and Services Logs, then Microsoft, then Windows, then Windows Defender.
  3. Double-click on Operational.
  4. In the details pane, view the list of individual events to find your event.
  5. Click the event to see specific details about an event in the lower pane, under the General and Details tabs.
Event ID: 1000
Symbolic name: MALWAREPROTECTION_SCAN_STARTED
Message: An antimalware scan started.
Description:
Scan ID: <ID number of the relevant scan.>
Scan Type: <Scan type>, for example:

  • Antivirus
  • Antispyware
  • Antimalware
Scan Parameters: <Scan parameters>, for example:

  • Full scan
  • Quick scan
  • Customer scan
Scan Resources: <Resources (such as files/directories/BHO) that were scanned.>
User: <Domain>\<User>
Event ID: 1001
Symbolic name: MALWAREPROTECTION_SCAN_COMPLETED
Message: An antimalware scan finished.
Description:
Scan ID: <ID number of the relevant scan.>
Scan Type: <Scan type>, for example:

  • Antivirus
  • Antispyware
  • Antimalware
Scan Parameters: <Scan parameters>, for example:

  • Full scan
  • Quick scan
  • Customer scan
User: <Domain>\<User>
Scan Time: <The duration of a scan.>
Event ID: 1002
Symbolic name: MALWAREPROTECTION_SCAN_CANCELLED
Message: An antimalware scan was stopped before it finished.
Description:
Scan ID: <ID number of the relevant scan.>
Scan Type: <Scan type>, for example:

  • Antivirus
  • Antispyware
  • Antimalware
Scan Parameters: <Scan parameters>, for example:

  • Full scan
  • Quick scan
  • Customer scan
User: <Domain>&lt;User>
Scan Time: <The duration of a scan.>
Event ID: 1003
Symbolic name: MALWAREPROTECTION_SCAN_PAUSED
Message: An antimalware scan was paused.
Description:
Scan ID: <ID number of the relevant scan.>
Scan Type: <Scan type>, for example:

  • Antivirus
  • Antispyware
  • Antimalware
Scan Parameters: <Scan parameters>, for example:

  • Full scan
  • Quick scan
  • Customer scan
User: <Domain>\<User>
Event ID: 1004
Symbolic name: MALWAREPROTECTION_SCAN_RESUMED
Message: An antimalware scan was resumed.
Description:
Scan ID: <ID number of the relevant scan.>
Scan Type: <Scan type>, for example:

  • Antivirus
  • Antispyware
  • Antimalware
Scan Parameters: <Scan parameters>, for example:

  • Full scan
  • Quick scan
  • Customer scan
User: <Domain>\<User>
Event ID: 1005
Symbolic name: MALWAREPROTECTION_SCAN_FAILED
Message: An antimalware scan failed.
Description:
Scan ID: <ID number of the relevant scan.>
Scan Type: <Scan type>, for example:

  • Antivirus
  • Antispyware
  • Antimalware
Scan Parameters: <Scan parameters>, for example:

  • Full scan
  • Quick scan
  • Customer scan
User: <Domain>\<User>
Error Code: <Error code> Result code associated with threat status. Standard HRESULT values.
Error Description: <Error description> Description of the error.
User action: The antivirus client encountered an error, and the current scan has stopped. The scan might fail due to a client-side issue. This event record includes the scan ID, type of scan (Microsoft Defender Antivirus, antispyware, antimalware), scan parameters, the user that started the scan, the error code, and a description of the error. To troubleshoot this event:

  1. Run the scan again.
  2. If it fails in the same way, go to the Microsoft Support site, enter the error number in the Search box to look for the error code.
  3. Contact Microsoft Technical Support.
Event ID: 1006
Symbolic name: MALWAREPROTECTION_MALWARE_DETECTED
Message: The antimalware engine found malware or other potentially unwanted software.
Description: For more information, see the following:

Name: <Threat name>
ID: <Threat ID>
Severity: <Severity>, for example:

  • Low
  • Moderate
  • High
  • Severe
Category: <Category description>, for example, any threat or malware type.
Path: <File path>
Detection Origin: <Detection origin>, for example:

  • Unknown
  • Local computer
  • Network share
  • Internet
  • Incoming traffic
  • Outgoing traffic
Detection Type: <Detection type>, for example:

  • Heuristics
  • Generic
  • Concrete
  • Dynamic signature
Detection Source: <Detection source> for example:

  • User: user initiated
  • System: system initiated
  • Real-time: real-time component initiated
  • IOAV: IE Downloads and Outlook Express Attachments initiated
  • NIS: Network inspection system
  • IEPROTECT: IE – IExtensionValidation; this protects against malicious webpage controls
  • Early Launch Antimalware (ELAM). This includes malware detected by the boot sequence
  • Remote attestation

Antimalware Scan Interface (AMSI). Primarily used to protect scripts (PowerShell, VBS), though it can be invoked by third parties as well. UAC

Status: <Status>
User: <Domain>\<User>
Process Name: <Process in the PID>
Signature Version: <Definition version>
Engine Version: <Antimalware Engine version>
Event ID: 1007
Symbolic name: MALWAREPROTECTION_MALWARE_ACTION_TAKEN
Message: The antimalware platform performed an action to protect your system from malware or other potentially unwanted software.
Description: Microsoft Defender Antivirus has taken action to protect this machine from malware or other potentially unwanted software. For more information, see the following:

User: <Domain>\<User>
Name: <Threat name>
ID: <Threat ID>
Severity: <Severity>, for example:

  • Low
  • Moderate
  • High
  • Severe
Category: <Category description>, for example, any threat or malware type.
Action: <Action>, for example:

  • Clean: The resource was cleaned
  • Quarantine: The resource was quarantined
  • Remove: The resource was deleted
  • Allow: The resource was allowed to execute/exist
  • User defined: User-defined action that is normally one from this list of actions that the user has specified
  • No action: No action
  • Block: The resource was blocked from executing
Status: <Status>
Signature Version: <Definition version>
Engine Version: <Antimalware Engine version>
Event ID: 1008
Symbolic name: MALWAREPROTECTION_MALWARE_ACTION_FAILED
Message: The antimalware platform attempted to perform an action to protect your system from malware or other potentially unwanted software, but the action failed.
Description: Microsoft Defender Antivirus has encountered an error when taking action on malware or other potentially unwanted software. For more information, see the following:

User: <Domain>\<User>
Name: <Threat name>
ID: <Threat ID>
Severity: <Severity>, for example:

  • Low
  • Moderate
  • High
  • Severe
Category: <Category description>, for example, any threat or malware type.
Path: <File path>
Action: <Action>, for example:

  • Clean: The resource was cleaned
  • Quarantine: The resource was quarantined
  • Remove: The resource was deleted
  • Allow: The resource was allowed to execute/exist
  • User defined: User-defined action that is normally one from this list of actions that the user has specified
  • No action: No action
  • Block: The resource was blocked from executing
Error Code: <Error code> Result code associated with threat status. Standard HRESULT values.
Error Description: <Error description> Description of the error.
Status: <Status>
Signature Version: <Definition version>
Engine Version: <Antimalware Engine version>
Event ID: 1009
Symbolic name: MALWAREPROTECTION_QUARANTINE_RESTORE
Message: The antimalware platform restored an item from quarantine.
Description: Microsoft Defender Antivirus has restored an item from quarantine. For more information, see the following:

Name: <Threat name>
ID: <Threat ID>
Severity: <Severity>, for example:

  • Low
  • Moderate
  • High
  • Severe
Category: <Category description>, for example, any threat or malware type.
Path: <File path>
User: <Domain>\<User>
Signature Version: <Definition version>
Engine Version: <Antimalware Engine version>
Event ID: 1010
Symbolic name: MALWAREPROTECTION_QUARANTINE_RESTORE_FAILED
Message: The antimalware platform could not restore an item from quarantine.
Description: Microsoft Defender Antivirus has encountered an error trying to restore an item from quarantine. For more information, see the following:

Name: <Threat name>
ID: <Threat ID>
Severity: <Severity>, for example:

  • Low
  • Moderate
  • High
  • Severe
Category: <Category description>, for example, any threat or malware type.
Path: <File path>
User: <Domain>\<User>
Error Code: <Error code> Result code associated with threat status. Standard HRESULT values.
Error Description: <Error description> Description of the error.
Signature Version: <Definition version>
Engine Version: <Antimalware Engine version>
Event ID: 1011
Symbolic name: MALWAREPROTECTION_QUARANTINE_DELETE
Message: The antimalware platform deleted an item from quarantine.
Description: Microsoft Defender Antivirus has deleted an item from quarantine.
For more information, see the following:

Name: <Threat name>
ID: <Threat ID>
Severity: <Severity>, for example:

  • Low
  • Moderate
  • High
  • Severe
Category: <Category description>, for example, any threat or malware type.
Path: <File path>
User: <Domain>\<User>
Signature Version: <Definition version>
Engine Version: <Antimalware Engine version>
Event ID: 1012
Symbolic name: MALWAREPROTECTION_QUARANTINE_DELETE_FAILED
Message: The antimalware platform could not delete an item from quarantine.
Description: Microsoft Defender Antivirus has encountered an error trying to delete an item from quarantine. For more information, see the following:

Name: <Threat name>
ID: <Threat ID>
Severity: <Severity>, for example:

  • Low
  • Moderate
  • High
  • Severe
Category: <Category description>, for example, any threat or malware type.
Path: <File path>
User: <Domain>\<User>
Error Code: <Error code> Result code associated with threat status. Standard HRESULT values.
Error Description: <Error description> Description of the error.
Signature Version: <Definition version>
Engine Version: <Antimalware Engine version>
Event ID: 1013
Symbolic name: MALWAREPROTECTION_MALWARE_HISTORY_DELETE
Message: The antimalware platform deleted history of malware and other potentially unwanted software.
Description: Microsoft Defender Antivirus has removed history of malware and other potentially unwanted software.

Time: The time when the event occurred, for example when the history is purged. This parameter is not used in threat events so that there is no confusion regarding whether it is remediation time or infection time. For those, we specifically call them as Action Time or Detection Time.
User: <Domain>\<User>
Event ID: 1014
Symbolic name: MALWAREPROTECTION_MALWARE_HISTORY_DELETE_FAILED
Message: The antimalware platform could not delete history of malware and other potentially unwanted software.
Description: Microsoft Defender Antivirus has encountered an error trying to remove history of malware and other potentially unwanted software.

Time: The time when the event occurred, for example when the history is purged. This parameter is not used in threat events so that there is no confusion regarding whether it is remediation time or infection time. For those, we specifically call them as Action Time or Detection Time.
User: <Domain>\<User>
Error Code: <Error code> Result code associated with threat status. Standard HRESULT values.
Error Description: <Error description> Description of the error.
Event ID: 1015
Symbolic name: MALWAREPROTECTION_BEHAVIOR_DETECTED
Message: The antimalware platform detected suspicious behavior.
Description: Microsoft Defender Antivirus has detected a suspicious behavior.
For more information, see the following:

Name: <Threat name>
ID: <Threat ID>
Severity: <Severity>, for example:

  • Low
  • Moderate
  • High
  • Severe
Category: <Category description>, for example, any threat or malware type.
Path: <File path>
Detection Origin: <Detection origin>, for example:

  • Unknown
  • Local computer
  • Network share
  • Internet
  • Incoming traffic
  • Outgoing traffic
Detection Type: <Detection type>, for example:

  • Heuristics
  • Generic
  • Concrete
  • Dynamic signature
Detection Source: <Detection source> for example:

  • User: user initiated
  • System: system initiated
  • Real-time: real-time component initiated
  • IOAV: IE Downloads and Outlook Express Attachments initiated
  • NIS: Network inspection system
  • IEPROTECT: IE – IExtensionValidation; this protects against malicious webpage controls
  • Early Launch Antimalware (ELAM). This includes malware detected by the boot sequence
  • Remote attestation

Antimalware Scan Interface (AMSI). Primarily used to protect scripts (PowerShell, VBS), though it can be invoked by third parties as well. UAC

Status: <Status>
User: <Domain>\<User>
Process Name: <Process in the PID>
Signature ID: Enumeration matching severity.
Signature Version: <Definition version>
Engine Version: <Antimalware Engine version>
Fidelity Label:
Target File Name: <File name> Name of the file.
Event ID: 1116
Symbolic name: MALWAREPROTECTION_STATE_MALWARE_DETECTED
Message: The antimalware platform detected malware or other potentially unwanted software.
Description: Microsoft Defender Antivirus has detected malware or other potentially unwanted software.
For more information, see the following:

Name: <Threat name>
ID: <Threat ID>
Severity: <Severity>, for example:

  • Low
  • Moderate
  • High
  • Severe
Category: <Category description>, for example, any threat or malware type.
Path: <File path>
Detection Origin: <Detection origin>, for example:

  • Unknown
  • Local computer
  • Network share
  • Internet
  • Incoming traffic
  • Outgoing traffic
Detection Type: <Detection type>, for example:

  • Heuristics
  • Generic
  • Concrete
  • Dynamic signature
Detection Source: <Detection source> for example:

  • User: user initiated
  • System: system initiated
  • Real-time: real-time component initiated
  • IOAV: IE Downloads and Outlook Express Attachments initiated
  • NIS: Network inspection system
  • IEPROTECT: IE – IExtensionValidation; this protects against malicious webpage controls
  • Early Launch Antimalware (ELAM). This includes malware detected by the boot sequence
  • Remote attestation

Antimalware Scan Interface (AMSI). Primarily used to protect scripts (PowerShell, VBS), though it can be invoked by third parties as well. UAC

User: <Domain>\<User>
Process Name: <Process in the PID>
Signature Version: <Definition version>
Engine Version: <Antimalware Engine version>
User action: No action is required. Microsoft Defender Antivirus can suspend and take routine action on this threat. If you want to remove the threat manually, in the Microsoft Defender Antivirus interface, click Clean Computer.
Event ID: 1117
Symbolic name: MALWAREPROTECTION_STATE_MALWARE_ACTION_TAKEN
Message: The antimalware platform performed an action to protect your system from malware or other potentially unwanted software.
Description: Microsoft Defender Antivirus has taken action to protect this machine from malware or other potentially unwanted software.
For more information, see the following:

Name: <Threat name>
ID: <Threat ID>
Severity: <Severity>, for example:

  • Low
  • Moderate
  • High
  • Severe
Category: <Category description>, for example, any threat or malware type.
Path: <File path>
Detection Origin: <Detection origin>, for example:

  • Unknown
  • Local computer
  • Network share
  • Internet
  • Incoming traffic
  • Outgoing traffic
Detection Type: <Detection type>, for example:

  • Heuristics
  • Generic
  • Concrete
  • Dynamic signature
Detection Source: <Detection source> for example:

  • User: user initiated
  • System: system initiated
  • Real-time: real-time component initiated
  • IOAV: IE Downloads and Outlook Express Attachments initiated
  • NIS: Network inspection system
  • IEPROTECT: IE – IExtensionValidation; this protects against malicious webpage controls
  • Early Launch Antimalware (ELAM). This includes malware detected by the boot sequence
  • Remote attestation

Antimalware Scan Interface (AMSI). Primarily used to protect scripts (PowerShell, VBS), though it can be invoked by third parties as well. UAC

User: <Domain>\<User>
Process Name: <Process in the PID>
Action: <Action>, for example:

  • Clean: The resource was cleaned
  • Quarantine: The resource was quarantined
  • Remove: The resource was deleted
  • Allow: The resource was allowed to execute/exist
  • User defined: User-defined action that is normally one from this list of actions that the user has specified
  • No action: No action
  • Block: The resource was blocked from executing
Action Status: <Description of additional actions>
Error Code: <Error code> Result code associated with threat status. Standard HRESULT values.
Error Description: <Error description> Description of the error.
Signature Version: <Definition version>
Engine Version: <Antimalware Engine version>

NOTE: Whenever Microsoft Defender Antivirus, Microsoft Security Essentials, Malicious Software Removal Tool, or System Center Endpoint Protection detects a malware, it will restore the following system settings and services that the malware might have changed:

  • Default Internet Explorer or Microsoft Edge setting
  • User Access Control settings
  • Chrome settings
  • Boot Control Data
  • Regedit and Task Manager registry settings
  • Windows Update, Background Intelligent Transfer Service, and Remote Procedure Call service
  • Windows Operating System files
The above context applies to the following client and server versions:
Operating system Operating system version
Client Operating System Windows Vista (Service Pack 1, or Service Pack 2), Windows 7 and later
Server Operating System Windows Server 2008, Windows Server 2008 R2, Windows Server 2012, and Windows Server 2016
User action: No action is necessary. Microsoft Defender Antivirus removed or quarantined a threat.
Event ID: 1118
Symbolic name: MALWAREPROTECTION_STATE_MALWARE_ACTION_FAILED
Message: The antimalware platform attempted to perform an action to protect your system from malware or other potentially unwanted software, but the action failed.
Description: Microsoft Defender Antivirus has encountered a non-critical error when taking action on malware or other potentially unwanted software.
For more information, see the following:

Name: <Threat name>
ID: <Threat ID>
Severity: <Severity>, for example:

  • Low
  • Moderate
  • High
  • Severe
Category: <Category description>, for example, any threat or malware type.
Path: <File path>
Detection Origin: <Detection origin>, for example:

  • Unknown
  • Local computer
  • Network share
  • Internet
  • Incoming traffic
  • Outgoing traffic
Detection Type: <Detection type>, for example:

  • Heuristics
  • Generic
  • Concrete
  • Dynamic signature
Detection Source: <Detection source> for example:

  • User: user initiated
  • System: system initiated
  • Real-time: real-time component initiated
  • IOAV: IE Downloads and Outlook Express Attachments initiated
  • NIS: Network inspection system
  • IEPROTECT: IE – IExtensionValidation; this protects against malicious webpage controls
  • Early Launch Antimalware (ELAM). This includes malware detected by the boot sequence
  • Remote attestation

Antimalware Scan Interface (AMSI). Primarily used to protect scripts (PowerShell, VBS), though it can be invoked by third parties as well. UAC

User: <Domain>\<User>
Process Name: <Process in the PID>
Action: <Action>, for example:

  • Clean: The resource was cleaned
  • Quarantine: The resource was quarantined
  • Remove: The resource was deleted
  • Allow: The resource was allowed to execute/exist
  • User defined: User-defined action that is normally one from this list of actions that the user has specified
  • No action: No action
  • Block: The resource was blocked from executing
Action Status: <Description of additional actions>
Error Code: <Error code> Result code associated with threat status. Standard HRESULT values.
Error Description: <Error description> Description of the error.
Signature Version: <Definition version>
Engine Version: <Antimalware Engine version>
User action: No action is necessary. Microsoft Defender Antivirus failed to complete a task related to the malware remediation. This is not a critical failure.
Event ID: 1119
Symbolic name: MALWAREPROTECTION_STATE_MALWARE_ACTION_CRITICALLY_FAILED
Message: The antimalware platform encountered a critical error when trying to take action on malware or other potentially unwanted software. There are more details in the event message.
Description: Microsoft Defender Antivirus has encountered a critical error when taking action on malware or other potentially unwanted software.
For more information, see the following:

Name: <Threat name>
ID: <Threat ID>
Severity: <Severity>, for example:

  • Low
  • Moderate
  • High
  • Severe
Category: <Category description>, for example, any threat or malware type.
Path: <File path>
Detection Origin: <Detection origin>, for example:

  • Unknown
  • Local computer
  • Network share
  • Internet
  • Incoming traffic
  • Outgoing traffic
Detection Type: <Detection type>, for example:

  • Heuristics
  • Generic
  • Concrete
  • Dynamic signature
Detection Source: <Detection source> for example:

  • User: user initiated
  • System: system initiated
  • Real-time: real-time component initiated
  • IOAV: IE Downloads and Outlook Express Attachments initiated
  • NIS: Network inspection system
  • IEPROTECT: IE – IExtensionValidation; this protects against malicious webpage controls
  • Early Launch Antimalware (ELAM). This includes malware detected by the boot sequence
  • Remote attestation

Antimalware Scan Interface (AMSI). Primarily used to protect scripts (PowerShell, VBS), though it can be invoked by third parties as well. UAC

User: <Domain>\<User>
Process Name: <Process in the PID>
Action: <Action>, for example:

  • Clean: The resource was cleaned
  • Quarantine: The resource was quarantined
  • Remove: The resource was deleted
  • Allow: The resource was allowed to execute/exist
  • User defined: User-defined action that is normally one from this list of actions that the user has specified
  • No action: No action
  • Block: The resource was blocked from executing
Action Status: <Description of additional actions>
Error Code: <Error code> Result code associated with threat status. Standard HRESULT values.
Error Description: <Error description> Description of the error.
Signature Version: <Definition version>
Engine Version: <Antimalware Engine version>
User action: The Microsoft Defender Antivirus client encountered this error due to critical issues. The endpoint might not be protected. Review the error description then follow the relevant User action steps below.

Action User action
Remove Update the definitions then verify that the removal was successful.
Clean Update the definitions then verify that the remediation was successful.
Quarantine Update the definitions and verify that the user has permission to access the necessary resources.
Allow Verify that the user has permission to access the necessary resources.

If this event persists:

  1. Run the scan again.
  2. If it fails in the same way, go to the Microsoft Support site, enter the error number in the Search box to look for the error code.
  3. Contact Microsoft Technical Support.
Event ID: 1120
Symbolic name: MALWAREPROTECTION_THREAT_HASH
Message: Microsoft Defender Antivirus has deduced the hashes for a threat resource.
Description: Microsoft Defender Antivirus client is up and running in a healthy state.

Current Platform Version: <Current platform version>
Threat Resource Path: <Path>
Hashes: <Hashes>
Note: This event will only be logged if the following policy is set: ThreatFileHashLogging unsigned.
Event ID: 1150
Symbolic name: MALWAREPROTECTION_SERVICE_HEALTHY
Message: If your antimalware platform reports status to a monitoring platform, this event indicates that the antimalware platform is running and in a healthy state.
Description: Microsoft Defender Antivirus client is up and running in a healthy state.

Platform Version: <Current platform version>
Signature Version: <Definition version>
Engine Version: <Antimalware Engine version>
User action: No action is necessary. The Microsoft Defender Antivirus client is in a healthy state. This event is reported on an hourly basis.
Event ID: 1151
Symbolic name: MALWAREPROTECTION_SERVICE_HEALTH_REPORT
Message: Endpoint Protection client health report (time in UTC)
Description: Antivirus client health report.

Platform Version: <Current platform version>
Engine Version: <Antimalware Engine version>
Network Realtime Inspection engine version: <Network Realtime Inspection engine version>
Antivirus signature version: <Antivirus signature version>
Antispyware signature version: <Antispyware signature version>
Network Realtime Inspection signature version: <Network Realtime Inspection signature version>
RTP state: <Realtime protection state> (Enabled or Disabled)
OA state: <On Access state> (Enabled or Disabled)
IOAV state: <IE Downloads and Outlook Express Attachments state> (Enabled or Disabled)
BM state: <Behavior Monitoring state> (Enabled or Disabled)
Antivirus signature age: <Antivirus signature age> (in days)
Antispyware signature age: <Antispyware signature age> (in days)
Last quick scan age: <Last quick scan age> (in days)
Last full scan age: <Last full scan age> (in days)
Antivirus signature creation time: ?<Antivirus signature creation time>
Antispyware signature creation time: ?<Antispyware signature creation time>
Last quick scan start time: ?<Last quick scan start time>
Last quick scan end time: ?<Last quick scan end time>
Last quick scan source: <Last quick scan source> (0 = scan didn’t run, 1 = user initiated, 2 = system initiated)
Last full scan start time: ?<Last full scan start time>
Last full scan end time: ?<Last full scan end time>
Last full scan source: <Last full scan source> (0 = scan didn’t run, 1 = user initiated, 2 = system initiated)
Product status: For internal troubleshooting
Event ID: 2000
Symbolic name: MALWAREPROTECTION_SIGNATURE_UPDATED
Message: The antimalware definitions updated successfully.
Description: Antivirus signature version has been updated.

Current Signature Version: <Current signature version>
Previous Signature Version: <Previous signature version>
Signature Type: <Signature type>, for example:

  • Antivirus
  • Antispyware
  • Antimalware
  • Network Inspection System
Update Type: <Update type>, either Full or Delta.
User: <Domain>\<User>
Current Engine Version: <Current engine version>
Previous Engine Version: <Previous engine version>
User action: No action is necessary. The Microsoft Defender Antivirus client is in a healthy state. This event is reported when signatures are successfully updated.
Event ID: 2001
Symbolic name: MALWAREPROTECTION_SIGNATURE_UPDATE_FAILED
Message: The security intelligence update failed.
Description: Microsoft Defender Antivirus has encountered an error trying to update signatures.

New security intelligence version: <New version number>
Previous security intelligence version: <Previous version>
Update Source: <Update source>, for example:

  • Security intelligence update folder
  • Internal security intelligence update server
  • Microsoft Update Server
  • File share
  • Microsoft Malware Protection Center (MMPC)
Update Stage: <Update stage>, for example:

  • Search
  • Download
  • Install
Source Path: File share name for Universal Naming Convention (UNC), server name for Windows Server Update Services (WSUS)/Microsoft Update/ADL.
Signature Type: <Signature type>, for example:

  • Antivirus
  • Antispyware
  • Antimalware
  • Network Inspection System
Update Type: <Update type>, either Full or Delta.
User: <Domain>\<User>
Current Engine Version: <Current engine version>
Previous Engine Version: <Previous engine version>
Error Code: <Error code> Result code associated with threat status. Standard HRESULT values.
Error Description: <Error description> Description of the error.
User action: This error occurs when there is a problem updating definitions. To troubleshoot this event:

  1. Update definitions and force a rescan directly on the endpoint.
  2. Review the entries in the %Windir%\WindowsUpdate.log file for more information about this error.
  3. Contact Microsoft Technical Support.
Event ID: 2002
Symbolic name: MALWAREPROTECTION_ENGINE_UPDATED
Message: The antimalware engine updated successfully.
Description: Microsoft Defender Antivirus engine version has been updated.

Current Engine Version: <Current engine version>
Previous Engine Version: <Previous engine version>
Engine Type: <Engine type>, either antimalware engine or Network Inspection System engine.
User: <Domain>\<User>
User action: No action is necessary. The Microsoft Defender Antivirus client is in a healthy state. This event is reported when the antimalware engine is successfully updated.
Event ID: 2003
Symbolic name: MALWAREPROTECTION_ENGINE_UPDATE_FAILED
Message: The antimalware engine update failed.
Description: Microsoft Defender Antivirus has encountered an error trying to update the engine.

New Engine Version:
Previous Engine Version: <Previous engine version>
Engine Type: <Engine type>, either antimalware engine or Network Inspection System engine.
User: <Domain>\<User>
Error Code: <Error code> Result code associated with threat status. Standard HRESULT values.
Error Description: <Error description> Description of the error.
User action: The Microsoft Defender Antivirus client update failed. This event occurs when the client fails to update itself. This event is usually due to an interruption in network connectivity during an update. To troubleshoot this event:

  1. Update definitions and force a rescan directly on the endpoint.
  2. Contact Microsoft Technical Support.
Event ID: 2004
Symbolic name: MALWAREPROTECTION_SIGNATURE_REVERSION
Message: There was a problem loading antimalware definitions. The antimalware engine will attempt to load the last-known good set of definitions.
Description: Microsoft Defender Antivirus has encountered an error trying to load signatures and will attempt reverting back to a known-good set of signatures.

Signatures Attempted:
Error Code: <Error code> Result code associated with threat status. Standard HRESULT values.
Error Description: <Error description> Description of the error.
Signature Version: <Definition version>
Engine Version: <Antimalware engine version>
User action: The Microsoft Defender Antivirus client attempted to download and install the latest definitions file and failed. This error can occur when the client encounters an error while trying to load the definitions, or if the file is corrupt. Microsoft Defender Antivirus will attempt to revert back to a known-good set of definitions. To troubleshoot this event:

  1. Restart the computer and try again.
  2. Download the latest definitions from the Microsoft Security Intelligence site. Note: The size of the definitions file downloaded from the site can exceed 60 MB and should not be used as a long-term solution for updating definitions.
  3. Contact Microsoft Technical Support.
Event ID: 2005
Symbolic name: MALWAREPROTECTION_ENGINE_UPDATE_PLATFORMOUTOFDATE
Message: The antimalware engine failed to load because the antimalware platform is out of date. The antimalware platform will load the last-known good antimalware engine and attempt to update.
Description: Microsoft Defender Antivirus could not load antimalware engine because current platform version is not supported. Microsoft Defender Antivirus will revert back to the last known-good engine and a platform update will be attempted.

Current Platform Version: <Current platform version>
Event ID: 2006
Symbolic name: MALWAREPROTECTION_PLATFORM_UPDATE_FAILED
Message: The platform update failed.
Description: Microsoft Defender Antivirus has encountered an error trying to update the platform.

Current Platform Version: <Current platform version>
Error Code: <Error code> Result code associated with threat status. Standard HRESULT values.
Error Description: <Error description> Description of the error.
Event ID: 2007
Symbolic name: MALWAREPROTECTION_PLATFORM_ALMOSTOUTOFDATE
Message: The platform will soon be out of date. Download the latest platform to maintain up-to-date protection.
Description: Microsoft Defender Antivirus will soon require a newer platform version to support future versions of the antimalware engine. Download the latest Microsoft Defender Antivirus platform to maintain the best level of protection available.

Current Platform Version: <Current platform version>
Event ID: 2010
Symbolic name: MALWAREPROTECTION_SIGNATURE_FASTPATH_UPDATED
Message: The antimalware engine used the Dynamic Signature Service to get additional definitions.
Description: Microsoft Defender Antivirus used Dynamic Signature Service to retrieve additional signatures to help protect your machine.

Current Signature Version: <Current signature version>
Signature Type: <Signature type>, for example:

  • Antivirus
  • Antispyware
  • Antimalware
  • Network Inspection System
Current Engine Version: <Current engine version>
Dynamic Signature Type: <Dynamic signature type>, for example:

  • Version
  • Timestamp
  • No limit
  • Duration
Persistence Path: <Path>
Dynamic Signature Version: <Version number>
Dynamic Signature Compilation Timestamp: <Timestamp>
Persistence Limit Type: <Persistence limit type>, for example:

  • VDM version
  • Timestamp
  • No limit
Persistence Limit: Persistence limit of the fastpath signature.
Event ID: 2011
Symbolic name: MALWAREPROTECTION_SIGNATURE_FASTPATH_DELETED
Message: The Dynamic Signature Service deleted the out-of-date dynamic definitions.
Description: Microsoft Defender Antivirus used Dynamic Signature Service to discard obsolete signatures.

Current Signature Version: <Current signature version>
Signature Type: <Signature type>, for example:

  • Antivirus
  • Antispyware
  • Antimalware
  • Network Inspection System
Current Engine Version: <Current engine version>
Dynamic Signature Type: <Dynamic signature type>, for example:

  • Version
  • Timestamp
  • No limit
  • Duration
Persistence Path: <Path>
Dynamic Signature Version: <Version number>
Dynamic Signature Compilation Timestamp: <Timestamp>
Removal Reason:
Persistence Limit Type: <Persistence limit type>, for example:

  • VDM version
  • Timestamp
  • No limit
Persistence Limit: Persistence limit of the fastpath signature.
User action: No action is necessary. The Microsoft Defender Antivirus client is in a healthy state. This event is reported when the Dynamic Signature Service successfully deletes out-of-date dynamic definitions.
Event ID: 2012
Symbolic name: MALWAREPROTECTION_SIGNATURE_FASTPATH_UPDATE_FAILED
Message: The antimalware engine encountered an error when trying to use the Dynamic Signature Service.
Description: Microsoft Defender Antivirus has encountered an error trying to use Dynamic Signature Service.

Current Signature Version: <Current signature version>
Signature Type: <Signature type>, for example:

  • Antivirus
  • Antispyware
  • Antimalware
  • Network Inspection System
Current Engine Version: <Current engine version>
Error Code: <Error code> Result code associated with threat status. Standard HRESULT values.
Error Description: <Error description> Description of the error.
Dynamic Signature Type: <Dynamic signature type>, for example:

  • Version
  • Timestamp
  • No limit
  • Duration
Persistence Path: <Path>
Dynamic Signature Version: <Version number>
Dynamic Signature Compilation Timestamp: <Timestamp>
Persistence Limit Type: <Persistence limit type>, for example:

  • VDM version
  • Timestamp
  • No limit
Persistence Limit: Persistence limit of the fastpath signature.
User action: Check your Internet connectivity settings.
Event ID: 2013
Symbolic name: MALWAREPROTECTION_SIGNATURE_FASTPATH_DELETED_ALL
Message: The Dynamic Signature Service deleted all dynamic definitions.
Description: Microsoft Defender Antivirus discarded all Dynamic Signature Service signatures.

Current Signature Version: <Current signature version>
Event ID: 2020
Symbolic name: MALWAREPROTECTION_CLOUD_CLEAN_RESTORE_FILE_DOWNLOADED
Message: The antimalware engine downloaded a clean file.
Description: Microsoft Defender Antivirus downloaded a clean file.

Filename: <File name> Name of the file.
Current Signature Version: <Current signature version>
Current Engine Version: <Current engine version>
Event ID: 2021
Symbolic name: MALWAREPROTECTION_CLOUD_CLEAN_RESTORE_FILE_DOWNLOAD_FAILED
Message: The antimalware engine failed to download a clean file.
Description: Microsoft Defender Antivirus has encountered an error trying to download a clean file.

Filename: <File name> Name of the file.
Current Signature Version: <Current signature version>
Current Engine Version: <Current engine version>
Error Code: <Error code> Result code associated with threat status. Standard HRESULT values.
Error Description: <Error description> Description of the error.
User action: Check your Internet connectivity settings. The Microsoft Defender Antivirus client encountered an error when using the Dynamic Signature Service to download the latest definitions to a specific threat. This error is likely caused by a network connectivity issue.
Event ID: 2030
Symbolic name: MALWAREPROTECTION_OFFLINE_SCAN_INSTALLED
Message: The antimalware engine was downloaded and is configured to run offline on the next system restart.
Description: Microsoft Defender Antivirus downloaded and configured offline antivirus to run on the next reboot.
Event ID: 2031
Symbolic name: MALWAREPROTECTION_OFFLINE_SCAN_INSTALL_FAILED
Message: The antimalware engine was unable to download and configure an offline scan.
Description: Microsoft Defender Antivirus has encountered an error trying to download and configure offline antivirus.

Error Code: <Error code> Result code associated with threat status. Standard HRESULT values.
Error Description: <Error description> Description of the error.
Event ID: 2040
Symbolic name: MALWAREPROTECTION_OS_EXPIRING
Message: Antimalware support for this operating system version will soon end.
Description: The support for your operating system will expire shortly. Running Microsoft Defender Antivirus on an out of support operating system is not an adequate solution to protect against threats.
Event ID: 2041
Symbolic name: MALWAREPROTECTION_OS_EOL
Message: Antimalware support for this operating system has ended. You must upgrade the operating system for continued support.
Description: The support for your operating system has expired. Running Microsoft Defender Antivirus on an out of support operating system is not an adequate solution to protect against threats.
Event ID: 2042
Symbolic name: MALWAREPROTECTION_PROTECTION_EOL
Message: The antimalware engine no longer supports this operating system, and is no longer protecting your system from malware.
Description: The support for your operating system has expired. Microsoft Defender Antivirus is no longer supported on your operating system, has stopped functioning, and is not protecting against malware threats.
Event ID: 3002
Symbolic name: MALWAREPROTECTION_RTP_FEATURE_FAILURE
Message: Real-time protection encountered an error and failed.
Description: Microsoft Defender Antivirus Real-Time Protection feature has encountered an error and failed.

Feature: <Feature>, for example:

  • On Access
  • Internet Explorer downloads and Microsoft Outlook Express attachments
  • Behavior monitoring
  • Network Inspection System
Error Code: <Error code> Result code associated with threat status. Standard HRESULT values.
Error Description: <Error description> Description of the error.
Reason: The reason Microsoft Defender Antivirus real-time protection has restarted a feature.
User action: You should restart the system then run a full scan because it’s possible the system was not protected for some time. The Microsoft Defender Antivirus client’s real-time protection feature encountered an error because one of the services failed to start. If it is followed by a 3007 event ID, the failure was temporary and the antimalware client recovered from the failure.
Event ID: 3007
Symbolic name: MALWAREPROTECTION_RTP_FEATURE_RECOVERED
Message: Real-time protection recovered from a failure. We recommend running a full system scan when you see this error.
Description: Microsoft Defender Antivirus Real-time Protection has restarted a feature. It is recommended that you run a full system scan to detect any items that may have been missed while this agent was down.

Feature: <Feature>, for example:

  • On Access
  • IE downloads and Outlook Express attachments
  • Behavior monitoring
  • Network Inspection System
Reason: The reason Microsoft Defender Antivirus real-time protection has restarted a feature.
User action: The real-time protection feature has restarted. If this event happens again, contact Microsoft Technical Support.
Event ID: 5000
Symbolic name: MALWAREPROTECTION_RTP_ENABLED
Message: Real-time protection is enabled.
Description: Microsoft Defender Antivirus real-time protection scanning for malware and other potentially unwanted software was enabled.
Event ID: 5001
Symbolic name: MALWAREPROTECTION_RTP_DISABLED
Message: Real-time protection is disabled.
Description: Microsoft Defender Antivirus real-time protection scanning for malware and other potentially unwanted software was disabled.
Event ID: 5004
Symbolic name: MALWAREPROTECTION_RTP_FEATURE_CONFIGURED
Message: The real-time protection configuration changed.
Description: Microsoft Defender Antivirus real-time protection feature configuration has changed.

Feature: <Feature>, for example:

  • On Access
  • IE downloads and Outlook Express attachments
  • Behavior monitoring
  • Network Inspection System
Configuration:
Event ID: 5007
Symbolic name: MALWAREPROTECTION_CONFIG_CHANGED
Message: The antimalware platform configuration changed.
Description: Microsoft Defender Antivirus configuration has changed. If this is an unexpected event, you should review the settings as this may be the result of malware.

Old value: <Old value number> Old antivirus configuration value.
New value: <New value number> New antivirus configuration value.
Event ID: 5008
Symbolic name: MALWAREPROTECTION_ENGINE_FAILURE
Message: The antimalware engine encountered an error and failed.
Description: Microsoft Defender Antivirus engine has been terminated due to an unexpected error.

Failure Type: <Failure type>, for example: Crash or Hang
Exception Code: <Error code>
Resource: <Resource>
User action: To troubleshoot this event:

  1. Try to restart the service.
    • For antimalware, antivirus and spyware, at an elevated command prompt, type net stop msmpsvc, and then type net start msmpsvc to restart the antimalware engine.
    • For the Network Inspection System, at an elevated command prompt, type net start nissrv, and then type net start nissrv to restart the Network Inspection System engine by using the NiSSRV.exe file.
  2. If it fails in the same way, look up the error code by accessing the Microsoft Support Site and entering the error number in the Search box, and contact Microsoft Technical Support.
User action: The Microsoft Defender Antivirus client engine stopped due to an unexpected error. To troubleshoot this event:

  1. Run the scan again.
  2. If it fails in the same way, go to the Microsoft Support site, enter the error number in the Search box to look for the error code.
  3. Contact Microsoft Technical Support.
Event ID: 5009
Symbolic name: MALWAREPROTECTION_ANTISPYWARE_ENABLED
Message: Scanning for malware and other potentially unwanted software is enabled.
Description: Microsoft Defender Antivirus scanning for malware and other potentially unwanted software has been enabled.
Event ID: 5010
Symbolic name: MALWAREPROTECTION_ANTISPYWARE_DISABLED
Message: Scanning for malware and other potentially unwanted software is disabled.
Description: Microsoft Defender Antivirus scanning for malware and other potentially unwanted software is disabled.
Event ID: 5011
Symbolic name: MALWAREPROTECTION_ANTIVIRUS_ENABLED
Message: Scanning for viruses is enabled.
Description: Microsoft Defender Antivirus scanning for viruses has been enabled.
Event ID: 5012
Symbolic name: MALWAREPROTECTION_ANTIVIRUS_DISABLED
Message: Scanning for viruses is disabled.
Description: Microsoft Defender Antivirus scanning for viruses is disabled.
Event ID: 5100
Symbolic name: MALWAREPROTECTION_EXPIRATION_WARNING_STATE
Message: The antimalware platform will expire soon.
Description: Microsoft Defender Antivirus has entered a grace period and will soon expire. After expiration, this program will disable protection against viruses, spyware, and other potentially unwanted software.

Expiration Reason: The reason Microsoft Defender Antivirus will expire.
Expiration Date: The date Microsoft Defender Antivirus will expire.
Event ID: 5101
Symbolic name: MALWAREPROTECTION_DISABLED_EXPIRED_STATE
Message: The antimalware platform is expired.
Description: Microsoft Defender Antivirus grace period has expired. Protection against viruses, spyware, and other potentially unwanted software is disabled.

Expiration Reason:
Expiration Date:
Error Code: <Error code> Result code associated with threat status. Standard HRESULT values.
Error Description: <Error description> Description of the error.

Microsoft Defender Antivirus client error codes

If Microsoft Defender Antivirus experiences any issues it will usually give you an error code to help you troubleshoot the issue. Most often an error means there was a problem installing an update. This section provides the following information about Microsoft Defender Antivirus client errors.

  • The error code
  • The possible reason for the error
  • Advice on what to do now

Use the information in these tables to help troubleshoot Microsoft Defender Antivirus error codes.

Error code: 0x80508007
Message ERR_MP_NO_MEMORY
Possible reason This error indicates that you might have run out of memory.
Resolution
  1. Check the available memory on your device.
  2. Close any unused applications that are running to free up memory on your device.
  3. Restart the device and run the scan again.
Error code: 0x8050800C
Message ERR_MP_BAD_INPUT_DATA
Possible reason This error indicates that there might be a problem with your security product.
Resolution
  1. Update the definitions. Either:
    1. Click the Update definitions button on the Update tab in Microsoft Defender Antivirus. Update definitions in Microsoft Defender AntivirusOr,
    2. Download the latest definitions from the Microsoft Security Intelligence site. Note: The size of the definitions file downloaded from the site can exceed 60 MB and should not be used as a long-term solution for updating definitions.
  2. Run a full scan.
  3. Restart the device and try again.
Error code: 0x80508020
Message ERR_MP_BAD_CONFIGURATION
Possible reason This error indicates that there might be an engine configuration error; commonly, this is related to input data that does not allow the engine to function properly.
Error code: 0x805080211
Message ERR_MP_QUARANTINE_FAILED
Possible reason This error indicates that Microsoft Defender Antivirus failed to quarantine a threat.
Error code: 0x80508022
Message ERR_MP_REBOOT_REQUIRED
Possible reason This error indicates that a reboot is required to complete threat removal.
0x80508023
Message ERR_MP_THREAT_NOT_FOUND
Possible reason This error indicates that the threat might no longer be present on the media, or malware might be stopping you from scanning your device.
Resolution Run the Microsoft Safety Scanner then update your security software and try again.
Error code: 0x80508024
Message ERR_MP_FULL_SCAN_REQUIRED
Possible reason This error indicates that a full system scan might be required.
Resolution Run a full system scan.
Error code: 0x80508025
Message ERR_MP_MANUAL_STEPS_REQUIRED
Possible reason This error indicates that manual steps are required to complete threat removal.
Resolution Follow the manual remediation steps outlined in the Microsoft Malware Protection Encyclopedia. You can find a threat-specific link in the event history.
Error code: 0x80508026
Message ERR_MP_REMOVE_NOT_SUPPORTED
Possible reason This error indicates that removal inside the container type might not be not supported.
Resolution Microsoft Defender Antivirus is not able to remediate threats detected inside the archive. Consider manually removing the detected resources.
Error code: 0x80508027
Message ERR_MP_REMOVE_LOW_MEDIUM_DISABLED
Possible reason This error indicates that removal of low and medium threats might be disabled.
Resolution Check the detected threats and resolve them as required.
Error code: 0x80508029
Message ERROR_MP_RESCAN_REQUIRED
Possible reason This error indicates a rescan of the threat is required.
Resolution Run a full system scan.
Error code: 0x80508030
Message ERROR_MP_CALLISTO_REQUIRED
Possible reason This error indicates that an offline scan is required.
Resolution Run offline Microsoft Defender Antivirus. You can read about how to do this in the offline Microsoft Defender Antivirus article.
Error code: 0x80508031
Message ERROR_MP_PLATFORM_OUTDATED
Possible reason This error indicates that Microsoft Defender Antivirus does not support the current version of the platform and requires a new version of the platform.
Resolution You can only use Microsoft Defender Antivirus in Windows 10 and Windows 11. For Windows 8, Windows 7 and Windows Vista, you can use System Center Endpoint Protection.

The following error codes are used during internal testing of Microsoft Defender Antivirus.

If you see these errors, you can try to update definitions and force a rescan directly on the endpoint.

Internal error codes
Error code Message displayed Possible reason for error and resolution
0x80501004 ERROR_MP_NO_INTERNET_CONN Check your Internet connection, then run the scan again.
0x80501000 ERROR_MP_UI_CONSOLIDATION_BASE This is an internal error. The cause is not clearly defined.
0x80501001 ERROR_MP_ACTIONS_FAILED
0x80501002 ERROR_MP_NOENGINE
0x80501003 ERROR_MP_ACTIVE_THREATS
0x805011011 MP_ERROR_CODE_LUA_CANCELLED
0x80501101 ERROR_LUA_CANCELLATION
0x80501102 MP_ERROR_CODE_ALREADY_SHUTDOWN
0x80501103 MP_ERROR_CODE_RDEVICE_S_ASYNC_CALL_PENDING
0x80501104 MP_ERROR_CODE_CANCELLED
0x80501105 MP_ERROR_CODE_NO_TARGETOS
0x80501106 MP_ERROR_CODE_BAD_REGEXP
0x80501107 MP_ERROR_TEST_INDUCED_ERROR
0x80501108 MP_ERROR_SIG_BACKUP_DISABLED
0x80508001 ERR_MP_BAD_INIT_MODULES
0x80508002 ERR_MP_BAD_DATABASE
0x80508004 ERR_MP_BAD_UFS
0x8050800C ERR_MP_BAD_INPUT_DATA
0x8050800D ERR_MP_BAD_GLOBAL_STORAGE
0x8050800E ERR_MP_OBSOLETE
0x8050800F ERR_MP_NOT_SUPPORTED
0x8050800F 0x80508010 ERR_MP_NO_MORE_ITEMS
0x80508011 ERR_MP_DUPLICATE_SCANID
0x80508012 ERR_MP_BAD_SCANID
0x80508013 ERR_MP_BAD_USERDB_VERSION
0x80508014 ERR_MP_RESTORE_FAILED
0x80508016 ERR_MP_BAD_ACTION
0x80508019 ERR_MP_NOT_FOUND
0x80509001 ERR_RELO_BAD_EHANDLE
0x80509003 ERR_RELO_KERNEL_NOT_LOADED
0x8050A001 ERR_MP_BADDB_OPEN
0x8050A002 ERR_MP_BADDB_HEADER
0x8050A003 ERR_MP_BADDB_OLDENGINE
0x8050A004 ERR_MP_BADDB_CONTENT
0x8050A005 ERR_MP_BADDB_NOTSIGNED
0x8050801 ERR_MP_REMOVE_FAILED This is an internal error. It might be triggered when malware removal is not successful.
0x80508018 ERR_MP_SCAN_ABORTED This is an internal error. It might have triggered when a scan fails to complete.

Source : Official Microsoft Brand
Editor by : BEST Antivirus KBS Team

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