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Suspicious Process Creation CallTrace

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Suspicious Process Creation CallTrace

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Identifies when a process is created and immediately accessed from an unknown memory code region and by the same parent process. This may indicate a code injection or hollowing attempt.

Rule type: eql

Rule indices:

winlogbeat-*
logs-windows.*

Severity: medium

Risk score: 43

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
Defense Evasion

Version: 1

Added (Elastic Stack release): 8.0.0

Rule authors: Elastic

Rule license: Elastic License v2

Rule query

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sequence by host.id with maxspan=1m [process where event.code == "1"
and /* sysmon process creation */ process.parent.name :
("winword.exe", "excel.exe", "outlook.exe", "powerpnt.exe",
"eqnedt32.exe", "fltldr.exe", "mspub.exe",
"msaccess.exe", "powershell.exe", "pwsh.exe",
"cscript.exe", "wscript.exe", "rundll32.exe", "regsvr32.exe",
"mshta.exe", "wmic.exe", "cmstp.exe",
"msxsl.exe")] by process.parent.entity_id, process.entity_id
[process where event.code == "10" and /* Sysmon process access
event from unknown module */ winlog.event_data.CallTrace :
"*UNKNOWN*"] by process.entity_id, winlog.event_data.TargetProcessGUID

Threat mapping

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Framework: MITRE ATT&CK^TM

Tactic:
- Name: Defense Evasion
- ID: TA0005
- Reference URL: https://attack.mitre.org/tactics/TA0005/
Technique:
- Name: Process Injection
- ID: T1055
- Reference URL: https://attack.mitre.org/techniques/T1055/

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