{"id":"b236190c-1c61-41e9-84b3-3fe03f6d76b0","title":"Potential Regsvr32 Commandline Flag Anomaly","description":"Detects a potential command line flag anomaly related to \"regsvr32\" in which the \"/i\" flag is used without the \"/n\" which should be uncommon.","author":"Florian Roth (Nextron Systems)","status":"test","level":"medium","date":"2019-07-13","modified":"2024-03-13","tags":["attack.stealth","attack.t1218.010"],"technique_ids":["T1218.010"],"logsource":{"category":"process_creation","product":"windows"},"falsepositives":["Administrator typo might cause some false positives"],"references":["https://twitter.com/sbousseaden/status/1282441816986484737?s=12"],"source_path":"rules/windows/process_creation/proc_creation_win_regsvr32_flags_anomaly.yml","source_sha256":"e4b145388b2a3a82f22f41ddd6bb507c93ee75e8c4f1d977797af1ff7b970f8c","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/process_creation/proc_creation_win_regsvr32_flags_anomaly.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: Potential Regsvr32 Commandline Flag Anomaly\nid: b236190c-1c61-41e9-84b3-3fe03f6d76b0\nstatus: test\ndescription: Detects a potential command line flag anomaly related to \"regsvr32\" in which the \"/i\" flag is used without the \"/n\" which should be uncommon.\nreferences:\n    - https://twitter.com/sbousseaden/status/1282441816986484737?s=12\nauthor: Florian Roth (Nextron Systems)\ndate: 2019-07-13\nmodified: 2024-03-13\ntags:\n    - attack.stealth\n    - attack.t1218.010\nlogsource:\n    category: process_creation\n    product: windows\ndetection:\n    selection:\n        Image|endswith: '\\regsvr32.exe'\n        CommandLine|contains|windash: ' -i:'\n    filter_main_flag:\n        CommandLine|contains|windash: ' -n '\n    condition: selection and not 1 of filter_main_*\nfalsepositives:\n    - Administrator typo might cause some false positives\nlevel: medium\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/b236190c-1c61-41e9-84b3-3fe03f6d76b0.json","kind":"sigma"}