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Unusual Parent Process for cmd.exe

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Unusual Parent Process for cmd.exe

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Identifies a suspicious parent child process relationship with cmd.exe descending from an unusual process.

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

Tags:

Elastic
Host
Windows
Threat Detection
Execution

Version: 7 (version history)

Added (Elastic Stack release): 7.10.0

Last modified (Elastic Stack release): 8.4.0

Rule authors: Elastic

Rule license: Elastic License v2

Investigation guide

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Rule query

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process where event.type in ("start", "process_started") and
process.name : "cmd.exe" and process.parent.name : ("lsass.exe",
"csrss.exe", "epad.exe",
"regsvr32.exe", "dllhost.exe",
"LogonUI.exe", "wermgr.exe",
"spoolsv.exe", "jucheck.exe",
"jusched.exe", "ctfmon.exe",
"taskhostw.exe", "GoogleUpdate.exe",
"sppsvc.exe", "sihost.exe",
"slui.exe", "SIHClient.exe",
"SearchIndexer.exe",
"SearchProtocolHost.exe",
"FlashPlayerUpdateService.exe",
"WerFault.exe", "WUDFHost.exe",
"unsecapp.exe", "wlanext.exe" )

Threat mapping

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Framework: MITRE ATT&CK^TM

Tactic:
- Name: Execution
- ID: TA0002
- Reference URL: https://attack.mitre.org/tactics/TA0002/
Technique:
- Name: Command and Scripting Interpreter
- ID: T1059
- Reference URL: https://attack.mitre.org/techniques/T1059/

Rule version history

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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.name:cmd.exe and process.parent.name:(lsass.exe or csrss.exe
or notepad.exe or regsvr32.exe or dllhost.exe or LogonUI.exe or
wermgr.exe or spoolsv.exe or jucheck.exe or jusched.exe or ctfmon.exe
or taskhostw.exe or GoogleUpdate.exe or sppsvc.exe or sihost.exe or
slui.exe or SIHClient.exe or SearchIndexer.exe or
SearchProtocolHost.exe or FlashPlayerUpdateService.exe or WerFault.exe
or WUDFHost.exe or unsecapp.exe or wlanext.exe)

Version 3 (7.12.0 release)

Formatting only

Version 2 (7.11.2 release)

Formatting only

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