Suspicious WerFault Child Processedit
A 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.*
- endgame-*
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
- Elastic Endgame
Version: 102 (version history)
Added (Elastic Stack release): 7.10.0
Last modified (Elastic Stack release): 8.6.0
Rule authors: Elastic
Rule license: Elastic License v2
Potential false positivesedit
Custom Windows error reporting debugger or applications restarted by WerFault after a crash.
Investigation guideedit
Rule queryedit
process where event.type == "start" 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 mappingedit
Framework: 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 historyedit
- Version 102 (8.6.0 release)
-
- Formatting only
- Version 101 (8.5.0 release)
-
-
Updated query, changed from:
process 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")
-
- Version 7 (8.4.0 release)
-
- Formatting only
- Version 5 (8.2.0 release)
-
- Formatting only
- 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