{"id":"27ba3207-dd30-4812-abbf-5d20c57d474e","title":"Suspicious Chromium Browser Instance Executed With Custom Extension","description":"Detects a suspicious process spawning a Chromium based browser process with the 'load-extension' flag to start an instance with a custom extension","author":"Aedan Russell, frack113, X__Junior (Nextron Systems)","status":"test","level":"high","date":"2022-06-19","modified":"2023-11-28","tags":["attack.persistence","attack.t1176.001"],"technique_ids":["T1176.001"],"logsource":{"category":"process_creation","product":"windows"},"falsepositives":["Unknown"],"references":["https://redcanary.com/blog/chromeloader/","https://emkc.org/s/RJjuLa","https://www.mandiant.com/resources/blog/lnk-between-browsers"],"source_path":"rules/windows/process_creation/proc_creation_win_browsers_chromium_susp_load_extension.yml","source_sha256":"758b9cd124b80edafa45ea4c84d405bb3f42a5d5a50cff2371e7ab708f0f938a","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/process_creation/proc_creation_win_browsers_chromium_susp_load_extension.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: Suspicious Chromium Browser Instance Executed With Custom Extension\nid: 27ba3207-dd30-4812-abbf-5d20c57d474e\nrelated:\n    - id: 88d6e60c-759d-4ac1-a447-c0f1466c2d21\n      type: similar\nstatus: test\ndescription: Detects a suspicious process spawning a Chromium based browser process with the 'load-extension' flag to start an instance with a custom extension\nreferences:\n    - https://redcanary.com/blog/chromeloader/\n    - https://emkc.org/s/RJjuLa\n    - https://www.mandiant.com/resources/blog/lnk-between-browsers\nauthor: Aedan Russell, frack113, X__Junior (Nextron Systems)\ndate: 2022-06-19\nmodified: 2023-11-28\ntags:\n    - attack.persistence\n    - attack.t1176.001\nlogsource:\n    category: process_creation\n    product: windows\ndetection:\n    selection:\n        ParentImage|endswith:\n            - '\\cmd.exe'\n            - '\\cscript.exe'\n            - '\\mshta.exe'\n            - '\\powershell.exe'\n            - '\\pwsh.exe'\n            - '\\regsvr32.exe'\n            - '\\rundll32.exe'\n            - '\\wscript.exe'\n        Image|endswith:\n            - '\\brave.exe'\n            - '\\chrome.exe'\n            - '\\msedge.exe'\n            - '\\opera.exe'\n            - '\\vivaldi.exe'\n        CommandLine|contains: '--load-extension='\n    condition: selection\nfalsepositives:\n    - Unknown\nlevel: high\nregression_tests_path: regression_data/rules/windows/process_creation/proc_creation_win_browsers_chromium_susp_load_extension/info.yml\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1176.001","id":"T1176.001","name":"Browser Extensions","page":"techniques/enterprise/T1176.001/"}],"data_path":"data/detection-rules/27ba3207-dd30-4812-abbf-5d20c57d474e.json","kind":"sigma"}