{"id":"b0524451-19af-4efa-a46f-562a977f792e","title":"ShimCache Flush","description":"Detects actions that clear the local ShimCache and remove forensic evidence","author":"Florian Roth (Nextron Systems)","status":"stable","level":"high","date":"2021-02-01","modified":"","tags":["attack.persistence","attack.defense-impairment","attack.t1112"],"technique_ids":["T1112"],"logsource":{"category":"process_creation","product":"windows"},"falsepositives":["Unknown"],"references":["https://medium.com/@blueteamops/shimcache-flush-89daff28d15e"],"source_path":"rules/windows/process_creation/proc_creation_win_rundll32_susp_shimcache_flush.yml","source_sha256":"2248b4d2397f49e2efce6167be23761b218370db7755f1b4919cae30328d29e9","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/process_creation/proc_creation_win_rundll32_susp_shimcache_flush.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: ShimCache Flush\nid: b0524451-19af-4efa-a46f-562a977f792e\nstatus: stable\ndescription: Detects actions that clear the local ShimCache and remove forensic evidence\nreferences:\n    - https://medium.com/@blueteamops/shimcache-flush-89daff28d15e\nauthor: Florian Roth (Nextron Systems)\ndate: 2021-02-01\ntags:\n    - attack.persistence\n    - attack.defense-impairment\n    - attack.t1112\nlogsource:\n    category: process_creation\n    product: windows\ndetection:\n    selection1a:\n        CommandLine|contains|all:\n            - 'rundll32'\n            - 'apphelp.dll'\n    selection1b:\n        CommandLine|contains:\n            - 'ShimFlushCache'\n            - '#250'\n    selection2a:\n        CommandLine|contains|all:\n            - 'rundll32'\n            - 'kernel32.dll'\n    selection2b:\n        CommandLine|contains:\n            - 'BaseFlushAppcompatCache'\n            - '#46'\n    condition: ( selection1a and selection1b ) or ( selection2a and selection2b )\nfalsepositives:\n    - Unknown\nlevel: high\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1112","id":"T1112","name":"Modify Registry","page":"techniques/enterprise/T1112/"}],"data_path":"data/detection-rules/b0524451-19af-4efa-a46f-562a977f792e.json","kind":"sigma"}