{"id":"5ef9853e-4d0e-4a70-846f-a9ca37d876da","title":"Potential Credential Dumping Activity Via LSASS","description":"Detects process access requests to the LSASS process with specific call trace calls and access masks.\nThis behaviour is expressed by many credential dumping tools such as Mimikatz, NanoDump, Invoke-Mimikatz, Procdump and even the Taskmgr dumping feature.\n","author":"Samir Bousseaden, Michael Haag","status":"test","level":"medium","date":"2019-04-03","modified":"2024-03-02","tags":["attack.credential-access","attack.t1003.001","attack.s0002"],"technique_ids":["T1003.001"],"logsource":{"category":"process_access","product":"windows"},"falsepositives":["Unknown"],"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/"],"source_path":"rules/windows/process_access/proc_access_win_lsass_memdump.yml","source_sha256":"089c24bd4ee1e29da5d6787ef3fca530820003eb0f99bb6f5718060aba6445ba","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/process_access/proc_access_win_lsass_memdump.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: Potential Credential Dumping Activity Via LSASS\nid: 5ef9853e-4d0e-4a70-846f-a9ca37d876da\nstatus: test\ndescription: |\n    Detects process access requests to the LSASS process with specific call trace calls and access masks.\n    This behaviour is expressed by many credential dumping tools such as Mimikatz, NanoDump, Invoke-Mimikatz, Procdump and even the Taskmgr dumping feature.\nreferences:\n    - https://web.archive.org/web/20230329170326/https://blog.menasec.net/2019/02/threat-hunting-21-procdump-or-taskmgr.html\n    - https://web.archive.org/web/20230208123920/https://cyberwardog.blogspot.com/2017/03/chronicles-of-threat-hunter-hunting-for_22.html\n    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1003.001/T1003.001.md\n    - https://research.splunk.com/endpoint/windows_possible_credential_dumping/\nauthor: Samir Bousseaden, Michael Haag\ndate: 2019-04-03\nmodified: 2024-03-02\ntags:\n    - attack.credential-access\n    - attack.t1003.001\n    - attack.s0002\nlogsource:\n    category: process_access\n    product: windows\ndetection:\n    selection:\n        TargetImage|endswith: '\\lsass.exe'\n        GrantedAccess|contains:\n            - '0x1038'\n            - '0x1438'\n            - '0x143a'\n            - '0x1fffff' # Too many false positives\n            # - '0x01000'  # Too many false positives\n            # - '0x1010'   # Too many false positives\n            # - '0x1400'  # Too many false positives\n            # - '0x1410' # Too many false positives\n            # - '0x40'   # Too many false positives\n        CallTrace|contains:\n            - 'dbgcore.dll'\n            - 'dbghelp.dll'\n            - 'kernel32.dll'\n            - 'kernelbase.dll'\n            - 'ntdll.dll'\n    filter_main_system_user:\n        SourceUser|contains: # Covers many language settings\n            - 'AUTHORI'\n            - 'AUTORI'\n    filter_optional_thor:\n        CallTrace|contains|all:\n            - ':\\Windows\\Temp\\asgard2-agent\\'\n            - '\\thor\\thor64.exe+'\n            - '|UNKNOWN('\n        GrantedAccess: '0x103800'\n    filter_optional_sysmon:\n        SourceImage|endswith: ':\\Windows\\Sysmon64.exe'\n    condition: selection and not 1 of filter_main_* and not 1 of filter_optional_*\nfalsepositives:\n    - Unknown\nlevel: medium\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1003.001","id":"T1003.001","name":"LSASS Memory","page":"techniques/enterprise/T1003.001/"}],"data_path":"data/detection-rules/5ef9853e-4d0e-4a70-846f-a9ca37d876da.json","kind":"sigma"}