IMPORTANT: No additional bug fixes or documentation updates will be released for this version. For the latest information, see the current release documentation.

« Renamed AutoIt Scripts Interpreter Microsoft Windows Defender Tampering »

› ›

Suspicious WerFault Child Process

edit

Suspicious WerFault Child Process

edit

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.*

Severity: medium

Risk score: 47

Runs every: 5m

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: 101

Rule authors:

Elastic

Rule license: Elastic License v2

Investigation guide

edit

Rule query

edit

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")

Framework: MITRE ATT&CK^TM

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/

« Renamed AutoIt Scripts Interpreter Microsoft Windows Defender Tampering »