{"id":"b5746143-59d6-4603-8d06-acbd60e166ee","title":"Uncommon Child Process Of AddinUtil.EXE","description":"Detects uncommon child processes of the Add-In deployment cache updating utility (AddInutil.exe) which could be a sign of potential abuse of the binary to proxy execution via a custom Addins.Store payload.\n","author":"Michael McKinley (@McKinleyMike), Tony Latteri (@TheLatteri)","status":"test","level":"medium","date":"2023-09-18","modified":"","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_child_process.yml","source_sha256":"1eda5ac620ba88b72ef853afa35852479ba4547b55779f3e9a39c8a57b6ec2a3","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/process_creation/proc_creation_win_addinutil_uncommon_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: Uncommon Child Process Of AddinUtil.EXE\nid: b5746143-59d6-4603-8d06-acbd60e166ee\nstatus: test\ndescription: |\n    Detects uncommon child processes of the Add-In deployment cache updating utility (AddInutil.exe) which could be a sign of potential abuse of the binary to proxy execution via a custom Addins.Store payload.\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\ntags:\n    - attack.stealth\n    - attack.t1218\nlogsource:\n    category: process_creation\n    product: windows\ndetection:\n    selection:\n        ParentImage|endswith: '\\addinutil.exe'\n    filter_main_werfault:\n        Image|endswith:\n            - ':\\Windows\\System32\\conhost.exe'\n            - ':\\Windows\\System32\\werfault.exe'\n            - ':\\Windows\\SysWOW64\\werfault.exe'\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/b5746143-59d6-4603-8d06-acbd60e166ee.json","kind":"sigma"}