Potential LSASS Clone Creation via PssCaptureSnapShot

Elastic Stack Serverless Security

Identifies the creation of an LSASS process clone via PssCaptureSnapShot where the parent process is the initial LSASS process instance. This may indicate an attempt to evade detection and dump LSASS memory for credential access.

Rule type: eql

Rule indices:

• winlogbeat-*
• logs-windows.*

Severity: high

Risk score: 73

Runs every: 5m

Searches indices from: now-9m (https://www.elastic.co/guide/en/elasticsearch/reference/current/common-options.html#date-math[Date Math format], see also Additional look-back time)

Maximum alerts per execution: 100

References:

• https://www.matteomalvica.com/blog/2019/12/02/win-defender-atp-cred-bypass/
• https://medium.com/@Achilles8284/the-birth-of-a-process-part-2-97c6fb9c42a2

Tags:

• Elastic
• Host
• Windows
• Threat Detection
• Credential Access

Version: 4

Rule authors:

• Elastic

Rule license: Elastic License v2

process where event.code:"4688" and
  process.executable : "?:\\Windows\\System32\\lsass.exe" and
  process.parent.executable : "?:\\Windows\\System32\\lsass.exe"

Framework: MITRE ATT&CKTM

• Tactic:

  • Name: Credential Access
  • ID: TA0006
  • Reference URL: https://attack.mitre.org/tactics/TA0006/

• Technique:

  • Name: OS Credential Dumping
  • ID: T1003
  • Reference URL: https://attack.mitre.org/techniques/T1003/

• Sub-technique:

  • Name: LSASS Memory
  • ID: T1003.001
  • Reference URL: https://attack.mitre.org/techniques/T1003/001/