{"id":"6120ac2a-a34b-42c0-a9bd-1fb9f459f348","title":"AddinUtil.EXE Execution From Uncommon Directory","description":"Detects execution of the Add-In deployment cache updating utility (AddInutil.exe) from a non-standard directory.","author":"Michael McKinley (@McKinleyMike), Tony Latteri (@TheLatteri)","status":"test","level":"medium","date":"2023-09-18","modified":"2025-02-24","tags":["attack.stealth","attack.t1218"],"technique_ids":["T1218"],"logsource":{"category":"process_creation","product":"windows"},"falsepositives":["Unknown"],"references":["https://www.blue-prints.blog/content/blog/posts/lolbin/addinutil-lolbas.html"],"source_path":"rules/windows/process_creation/proc_creation_win_addinutil_uncommon_dir_exec.yml","source_sha256":"d5a6c424d8317fde9ed864990144ee3903d7e8d0e4365c633b7fd3842b0df48b","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/process_creation/proc_creation_win_addinutil_uncommon_dir_exec.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: AddinUtil.EXE Execution From Uncommon Directory\nid: 6120ac2a-a34b-42c0-a9bd-1fb9f459f348\nstatus: test\ndescription: Detects execution of the Add-In deployment cache updating utility (AddInutil.exe) from a non-standard directory.\nreferences:\n    - https://www.blue-prints.blog/content/blog/posts/lolbin/addinutil-lolbas.html\nauthor: Michael McKinley (@McKinleyMike), Tony Latteri (@TheLatteri)\ndate: 2023-09-18\nmodified: 2025-02-24\ntags:\n    - attack.stealth\n    - attack.t1218\nlogsource:\n    category: process_creation\n    product: windows\ndetection:\n    selection:\n        - Image|endswith: '\\addinutil.exe'\n        - OriginalFileName: 'AddInUtil.exe'\n    filter_main_legit_location:\n        Image|contains:\n            - ':\\Windows\\Microsoft.NET\\Framework\\'\n            - ':\\Windows\\Microsoft.NET\\Framework64\\'\n            - ':\\Windows\\Microsoft.NET\\FrameworkArm\\'\n            - ':\\Windows\\Microsoft.NET\\FrameworkArm64\\'\n            - ':\\Windows\\WinSxS\\'\n    condition: selection and not 1 of filter_main_*\nfalsepositives:\n    - Unknown\nlevel: medium\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1218","id":"T1218","name":"System Binary Proxy Execution","page":"techniques/enterprise/T1218/"}],"data_path":"data/detection-rules/6120ac2a-a34b-42c0-a9bd-1fb9f459f348.json","kind":"sigma"}