{"id":"9f38c1db-e2ae-40bf-81d0-5b68f73fb512","title":"Suspicious BitLocker Access Agent Update Utility Execution","description":"Detects the execution of the BitLocker Access Agent Update Utility (baaupdate.exe) which is not a common parent process for other processes.\nSuspicious child processes spawned by baaupdate.exe could indicate an attempt at lateral movement via BitLocker DCOM & COM Hijacking.\n","author":"andrewdanis, Swachchhanda Shrawan Poudel (Nextron Systems)","status":"experimental","level":"high","date":"2025-10-18","modified":"","tags":["attack.stealth","attack.t1218","attack.lateral-movement","attack.t1021.003"],"technique_ids":["T1021.003","T1218"],"logsource":{"category":"process_creation","product":"windows"},"falsepositives":["Unknown"],"references":["https://github.com/rtecCyberSec/BitlockMove"],"source_path":"rules/windows/process_creation/proc_creation_win_baaupdate_susp_child_process.yml","source_sha256":"0b2b65e9f5691d701d7ccd9a0499d02a9a1791ed112e61038caab55b7f4e9da7","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/process_creation/proc_creation_win_baaupdate_susp_child_process.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: Suspicious BitLocker Access Agent Update Utility Execution\nid: 9f38c1db-e2ae-40bf-81d0-5b68f73fb512\nrelated:\n    - id: 6e8fe0a8-ba0b-4a93-8f9e-82657e7a5984 # BaaUpdate.exe Suspicious DLL Load\n      type: similar\nstatus: experimental\ndescription: |\n    Detects the execution of the BitLocker Access Agent Update Utility (baaupdate.exe) which is not a common parent process for other processes.\n    Suspicious child processes spawned by baaupdate.exe could indicate an attempt at lateral movement via BitLocker DCOM & COM Hijacking.\nreferences:\n    - https://github.com/rtecCyberSec/BitlockMove\nauthor: andrewdanis, Swachchhanda Shrawan Poudel (Nextron Systems)\ndate: 2025-10-18\ntags:\n    - attack.stealth\n    - attack.t1218\n    - attack.lateral-movement\n    - attack.t1021.003\nlogsource:\n    category: process_creation\n    product: windows\ndetection:\n    selection:\n        ParentImage|endswith: '\\baaupdate.exe'\n        Image|endswith:\n            - '\\bitsadmin.exe'\n            - '\\cmd.exe'\n            - '\\cscript.exe'\n            - '\\mshta.exe'\n            - '\\powershell_ise.exe'\n            - '\\powershell.exe'\n            - '\\regsvr32.exe'\n            - '\\rundll32.exe'\n            - '\\schtasks.exe'\n            - '\\wmic.exe'\n            - '\\wscript.exe'\n    condition: selection\nfalsepositives:\n    - Unknown\nlevel: high\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1021.003","id":"T1021.003","name":"Distributed Component Object Model","page":"techniques/enterprise/T1021.003/"},{"key":"enterprise/T1218","id":"T1218","name":"System Binary Proxy Execution","page":"techniques/enterprise/T1218/"}],"data_path":"data/detection-rules/9f38c1db-e2ae-40bf-81d0-5b68f73fb512.json","kind":"sigma"}