Potential Credential Dumping Activity Via LSASS

01

Beschreibung

Was dies ist, in Kürze.

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.

02

Regelquelle (YAML)

title: Potential Credential Dumping Activity Via LSASS
id: 5ef9853e-4d0e-4a70-846f-a9ca37d876da
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' # Too many false positives
            # - '0x01000'  # Too many false positives
            # - '0x1010'   # Too many false positives
            # - '0x1400'  # Too many false positives
            # - '0x1410' # Too many false positives
            # - '0x40'   # Too many false positives
        CallTrace|contains:
            - 'dbgcore.dll'
            - 'dbghelp.dll'
            - 'kernel32.dll'
            - 'kernelbase.dll'
            - 'ntdll.dll'
    filter_main_system_user:
        SourceUser|contains: # Covers many language settings
            - '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

04

erkennt Techniken (1)

ATT&CK-Techniken, die dies ermöglicht oder abbildet.

T1003.001LSASS Memory

05

genannte Software (1)

Zugehörige Malware und Tools.

S0002Mimikatz

06

Referenzen

Externe Belege — Patches, Meldungen, Analysen.