Potential Credential Dumping Activity Via LSASS

Title: Potential Credential Dumping Activity Via LSASS
Status: test
Description:Detects process access requests to the LSASS process with specific call trace calls and access masks. This behaviour is expressed by many credential dumping tools such as Mimikatz, NanoDump, Invoke-Mimikatz, Procdump and even the Taskmgr dumping feature.
References:
  -https://web.archive.org/web/20230329170326/https://blog.menasec.net/2019/02/threat-hunting-21-procdump-or-taskmgr.html
  -https://web.archive.org/web/20230208123920/https://cyberwardog.blogspot.com/2017/03/chronicles-of-threat-hunter-hunting-for_22.html
  -https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1003.001/T1003.001.md
  -https://research.splunk.com/endpoint/windows_possible_credential_dumping/
Author: Samir Bousseaden, Michael Haag
Date: 2019-04-03
modified:2026-06-29
Tags:

• -'attack.credential-access'
• -'attack.t1003.001'
• -'attack.s0002'

Logsource:

• category: process_access
• product: windows

Detection:
  selection:
    TargetImage|endswith: '\lsass.exe'
    GrantedAccess|contains:
      -'0x1038'
      -'0x1438'
      -'0x143a'
      -'0x1fffff'

    CallTrace|contains:
      -'dbgcore.dll'
      -'dbghelp.dll'
      -'kernel32.dll'
      -'kernelbase.dll'
      -'ntdll.dll'

  filter_main_system_user:
    SourceUser|contains:
      -'AUTHORI'
      -'AUTORI'

  filter_optional_thor:
    CallTrace|contains|all:
      -':\Windows\Temp\asgard2-agent\'
      -'\thor\thor64.exe+'
      -'|UNKNOWN('

    GrantedAccess: '0x103800'
  filter_optional_sysmon:
    SourceImage|endswith:
      -':\Windows\Sysmon64.exe'
      -':\Windows\Sysmon64a.exe'

  condition:selection and not 1 of filter_main_* and not 1 of filter_optional_*
Falsepositives:
  -Unknown
Level: medium