{"id":"1775e15e-b61b-4d14-a1a3-80981298085a","title":"Rundll32 Execution Without CommandLine Parameters","description":"Detects suspicious start of rundll32.exe without any parameters as found in CobaltStrike beacon activity","author":"Florian Roth (Nextron Systems)","status":"test","level":"high","date":"2021-05-27","modified":"2023-08-31","tags":["attack.stealth","attack.t1202"],"technique_ids":["T1202"],"logsource":{"category":"process_creation","product":"windows"},"falsepositives":["Possible but rare"],"references":["https://www.cobaltstrike.com/help-opsec","https://twitter.com/ber_m1ng/status/1397948048135778309"],"source_path":"rules/windows/process_creation/proc_creation_win_rundll32_no_params.yml","source_sha256":"6fd4e847b4558ff146d0114f613d699a09a8fd252e59b2efdbc4c5c445dee24b","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/process_creation/proc_creation_win_rundll32_no_params.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: Rundll32 Execution Without CommandLine Parameters\nid: 1775e15e-b61b-4d14-a1a3-80981298085a\nstatus: test\ndescription: Detects suspicious start of rundll32.exe without any parameters as found in CobaltStrike beacon activity\nreferences:\n    - https://www.cobaltstrike.com/help-opsec\n    - https://twitter.com/ber_m1ng/status/1397948048135778309\nauthor: Florian Roth (Nextron Systems)\ndate: 2021-05-27\nmodified: 2023-08-31\ntags:\n    - attack.stealth\n    - attack.t1202\nlogsource:\n    category: process_creation\n    product: windows\ndetection:\n    selection:\n        CommandLine|endswith:\n            - '\\rundll32.exe'\n            - '\\rundll32.exe\"'\n            - '\\rundll32'\n    filter:\n        ParentImage|contains:\n            - '\\AppData\\Local\\'\n            - '\\Microsoft\\Edge\\'\n    condition: selection and not filter\nfalsepositives:\n    - Possible but rare\nlevel: high\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1202","id":"T1202","name":"Indirect Command Execution","page":"techniques/enterprise/T1202/"}],"data_path":"data/detection-rules/1775e15e-b61b-4d14-a1a3-80981298085a.json","kind":"sigma"}