IMPORTANT: No additional bug fixes or documentation updates
will be released for this version. For the latest information, see the
current release documentation.
Suspicious WerFault Child Process
editSuspicious WerFault Child Process
editA suspicious WerFault child process was detected, which may indicate an attempt to run unnoticed. Verify process details such as command line, network connections, file writes and parent process details as well.
Rule type: eql
Rule indices:
- winlogbeat-*
- logs-endpoint.events.*
- logs-windows.*
Severity: medium
Risk score: 47
Runs every: 5 minutes
Searches indices from: now-9m (Date Math format, see also Additional look-back time
)
Maximum alerts per execution: 100
References:
Tags:
- Elastic
- Host
- Windows
- Threat Detection
- Defense Evasion
Version: 4 (version history)
Added (Elastic Stack release): 7.10.0
Last modified (Elastic Stack release): 7.13.0
Rule authors: Elastic
Rule license: Elastic License v2
Potential false positives
editCustom Windows error reporting debugger or applications restarted by WerFault after a crash.
Rule query
editprocess where event.type in ("start", "process_started") and process.parent.name : "WerFault.exe" and not process.name : ("cofire.exe", "psr.exe", "VsJITDebugger.exe", "TTTracer.exe", "rundll32.exe", "LogiOptionsMgr.exe") and not process.args : ("/LOADSAVEDWINDOWS", "/restore", "RestartByRestartManager*", "--restarted", "createdump", "dontsend", "/watson")
Threat mapping
editFramework: MITRE ATT&CKTM
-
Tactic:
- Name: Defense Evasion
- ID: TA0005
- Reference URL: https://attack.mitre.org/tactics/TA0005/
-
Technique:
- Name: Masquerading
- ID: T1036
- Reference URL: https://attack.mitre.org/techniques/T1036/
Rule version history
edit- Version 4 (7.13.0 release)
-
-
Updated query, changed from:
event.category:process and event.type:(start or process_started) and process.parent.name:WerFault.exe and not process.name:(cofire.exe or psr.exe or VsJITDebugger.exe or TTTracer.exe or rundll32.exe)
-
- Version 3 (7.12.0 release)
-
- Formatting only
- Version 2 (7.11.2 release)
-
- Formatting only