{"id":"e9f8f8cc-07cc-4e81-b724-f387db9175e4","title":"Potentially Suspicious Execution Of Regasm/Regsvcs With Uncommon Extension","description":"Detects potentially suspicious execution of the Regasm/Regsvcs utilities with an uncommon extension.","author":"Nasreddine Bencherchali (Nextron Systems)","status":"test","level":"medium","date":"2023-02-13","modified":"","tags":["attack.stealth","attack.t1218.009"],"technique_ids":["T1218.009"],"logsource":{"category":"process_creation","product":"windows"},"falsepositives":["Unknown"],"references":["https://www.fortiguard.com/threat-signal-report/4718?s=09","https://lolbas-project.github.io/lolbas/Binaries/Regasm/","https://lolbas-project.github.io/lolbas/Binaries/Regsvcs/"],"source_path":"rules/windows/process_creation/proc_creation_win_regasm_regsvcs_uncommon_extension_execution.yml","source_sha256":"383e2b5e706c1431f2f1b55b6071cb98abca7b042c910ba34ba6b03a833f99d6","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/process_creation/proc_creation_win_regasm_regsvcs_uncommon_extension_execution.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: Potentially Suspicious Execution Of Regasm/Regsvcs With Uncommon Extension\nid: e9f8f8cc-07cc-4e81-b724-f387db9175e4\nrelated:\n    - id: cc368ed0-2411-45dc-a222-510ace303cb2\n      type: derived\nstatus: test\ndescription: Detects potentially suspicious execution of the Regasm/Regsvcs utilities with an uncommon extension.\nreferences:\n    - https://www.fortiguard.com/threat-signal-report/4718?s=09\n    - https://lolbas-project.github.io/lolbas/Binaries/Regasm/\n    - https://lolbas-project.github.io/lolbas/Binaries/Regsvcs/\nauthor: Nasreddine Bencherchali (Nextron Systems)\ndate: 2023-02-13\ntags:\n    - attack.stealth\n    - attack.t1218.009\nlogsource:\n    category: process_creation\n    product: windows\ndetection:\n    selection_img:\n        - Image|endswith:\n              - '\\Regsvcs.exe'\n              - '\\Regasm.exe'\n        - OriginalFileName:\n              - 'RegSvcs.exe'\n              - 'RegAsm.exe'\n    selection_extension:\n        CommandLine|contains:\n            # Note: Add more potentially uncommon extensions\n            - '.dat'\n            - '.gif'\n            - '.jpeg'\n            - '.jpg'\n            - '.png'\n            - '.txt'\n    condition: all of selection_*\nfalsepositives:\n    - Unknown\nlevel: medium\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1218.009","id":"T1218.009","name":"Regsvcs/Regasm","page":"techniques/enterprise/T1218.009/"}],"data_path":"data/detection-rules/e9f8f8cc-07cc-4e81-b724-f387db9175e4.json","kind":"sigma"}