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-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



  • Elastic
  • Host
  • Windows
  • Threat Detection
  • Defense Evasion

Version: 101 (version history)

Added (Elastic Stack release): 7.10.0

Last modified (Elastic Stack release): 8.5.0

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 :
"WerFault.exe" and not : ("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


Rule version historyedit

Version 101 (8.5.0 release)
  • Updated query, changed from:

    process where event.type in ("start", "process_started") and : "WerFault.exe" and not :
    ("cofire.exe", "psr.exe",
    "VsJITDebugger.exe", "TTTracer.exe",
    "rundll32.exe", "LogiOptionsMgr.exe") and not
    process.args : ("/LOADSAVEDWINDOWS", "/restore",
    "RestartByRestartManager*", "--restarted",
    "createdump", "dontsend",
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 and not 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