{"id":"327ff235-94eb-4f06-b9de-aaee571324be","title":"Regsvr32 Execution From Highly Suspicious Location","description":"Detects execution of regsvr32 where the DLL is located in a highly suspicious locations","author":"Nasreddine Bencherchali (Nextron Systems)","status":"test","level":"high","date":"2023-05-26","modified":"","tags":["attack.stealth","attack.t1218.010"],"technique_ids":["T1218.010"],"logsource":{"category":"process_creation","product":"windows"},"falsepositives":["Unlikely"],"references":["Internal Research"],"source_path":"rules/windows/process_creation/proc_creation_win_regsvr32_susp_exec_path_2.yml","source_sha256":"4d60571b86ff37853c026965c7e07f05d3bf426dd84a2a5ccca1a2907ebd07e5","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/process_creation/proc_creation_win_regsvr32_susp_exec_path_2.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: Regsvr32 Execution From Highly Suspicious Location\nid: 327ff235-94eb-4f06-b9de-aaee571324be\nstatus: test\ndescription: Detects execution of regsvr32 where the DLL is located in a highly suspicious locations\nreferences:\n    - Internal Research\nauthor: Nasreddine Bencherchali (Nextron Systems)\ndate: 2023-05-26\ntags:\n    - attack.stealth\n    - attack.t1218.010\nlogsource:\n    category: process_creation\n    product: windows\ndetection:\n    selection_img:\n        - Image|endswith: '\\regsvr32.exe'\n        - OriginalFileName: 'REGSVR32.EXE'\n    selection_path_1:\n        CommandLine|contains:\n            - ':\\PerfLogs\\'\n            - ':\\Temp\\'\n            - '\\Windows\\Registration\\CRMLog'\n            - '\\Windows\\System32\\com\\dmp\\'\n            - '\\Windows\\System32\\FxsTmp\\'\n            - '\\Windows\\System32\\Microsoft\\Crypto\\RSA\\MachineKeys\\'\n            - '\\Windows\\System32\\spool\\drivers\\color\\'\n            - '\\Windows\\System32\\spool\\PRINTERS\\'\n            - '\\Windows\\System32\\spool\\SERVERS\\'\n            - '\\Windows\\System32\\Tasks_Migrated\\'\n            - '\\Windows\\System32\\Tasks\\Microsoft\\Windows\\SyncCenter\\'\n            - '\\Windows\\SysWOW64\\com\\dmp\\'\n            - '\\Windows\\SysWOW64\\FxsTmp\\'\n            - '\\Windows\\SysWOW64\\Tasks\\Microsoft\\Windows\\PLA\\System\\'\n            - '\\Windows\\SysWOW64\\Tasks\\Microsoft\\Windows\\SyncCenter\\'\n            - '\\Windows\\Tasks\\'\n            - '\\Windows\\Tracing\\'\n    selection_path_2:\n        CommandLine|contains:\n            # This is to avoid collisions with CLI starting with \"C:\\\"\n            - ' \"C:\\'\n            - ' C:\\'\n            - \" 'C:\\\\\"\n            - 'D:\\'\n    selection_exclude_known_dirs:\n        CommandLine|contains:\n            # Note: add additional locations that are related to third party applications\n            - 'C:\\Program Files (x86)\\'\n            - 'C:\\Program Files\\'\n            - 'C:\\ProgramData\\'\n            - 'C:\\Users\\'\n            # Note: The space added here are to avoid collisions with the \"regsvr32\" binary full path\n            - ' C:\\Windows\\'\n            - ' \"C:\\Windows\\'\n            - \" 'C:\\\\Windows\\\\\"\n    filter_main_empty:\n        CommandLine: ''\n    filter_main_null:\n        CommandLine: null\n    condition: selection_img and (selection_path_1 or (selection_path_2 and not selection_exclude_known_dirs)) and not 1 of filter_main_*\nfalsepositives:\n    - Unlikely\nlevel: high\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1218.010","id":"T1218.010","name":"Regsvr32","page":"techniques/enterprise/T1218.010/"}],"data_path":"data/detection-rules/327ff235-94eb-4f06-b9de-aaee571324be.json","kind":"sigma"}