Potential LSASS Memory Dump via PssCaptureSnapShot

Elastic Stack Serverless Security

Identifies suspicious access to an LSASS handle via PssCaptureSnapShot where two successive process accesses are performed by the same process and target two different instances of LSASS. This may indicate an attempt to evade detection and dump LSASS memory for credential access.

Rule type: threshold

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://twitter.com/sbousseaden/status/1280619931516747777?lang=en

Tags:

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

Version: 101

Rule authors:

• Elastic

Rule license: Elastic License v2

event.category:process and event.code:10 and
 winlog.event_data.TargetImage:("C:\\Windows\\system32\\lsass.exe" or
                                 "c:\\Windows\\system32\\lsass.exe" or
                                 "c:\\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/