{"id":"94771a71-ba41-4b6e-a757-b531372eaab6","title":"File Download From Browser Process Via Inline URL","description":"Detects execution of a browser process with a URL argument pointing to a file with a potentially interesting extension. This can be abused to download arbitrary files or to hide from the user for example by launching the browser in a minimized state.","author":"Florian Roth (Nextron Systems), Nasreddine Bencherchali (Nextron Systems)","status":"test","level":"medium","date":"2022-01-11","modified":"2025-10-27","tags":["attack.command-and-control","attack.t1105"],"technique_ids":["T1105"],"logsource":{"category":"process_creation","product":"windows"},"falsepositives":["Unknown"],"references":["https://twitter.com/mrd0x/status/1478116126005641220","https://lolbas-project.github.io/lolbas/Binaries/Msedge/"],"source_path":"rules/windows/process_creation/proc_creation_win_browsers_inline_file_download.yml","source_sha256":"8bb724b6b88618b1d4124e5f0b2a11467ac3d0d98bb059ffa7daf9f75d0567f5","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/process_creation/proc_creation_win_browsers_inline_file_download.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: File Download From Browser Process Via Inline URL\nid: 94771a71-ba41-4b6e-a757-b531372eaab6\nstatus: test\ndescription: Detects execution of a browser process with a URL argument pointing to a file with a potentially interesting extension. This can be abused to download arbitrary files or to hide from the user for example by launching the browser in a minimized state.\nreferences:\n    - https://twitter.com/mrd0x/status/1478116126005641220\n    - https://lolbas-project.github.io/lolbas/Binaries/Msedge/\nauthor: Florian Roth (Nextron Systems), Nasreddine Bencherchali (Nextron Systems)\ndate: 2022-01-11\nmodified: 2025-10-27\ntags:\n    - attack.command-and-control\n    - attack.t1105\nlogsource:\n    category: process_creation\n    product: windows\ndetection:\n    selection_img:\n        Image|endswith:\n            - '\\brave.exe'\n            - '\\chrome.exe'\n            - '\\msedge.exe'\n            - '\\opera.exe'\n            - '\\vivaldi.exe'\n    selection_http:\n        CommandLine|contains: 'http'\n    selection_extensions:\n        - CommandLine|endswith:\n              - '.7z'\n              - '.dat'\n              - '.dll'\n              - '.exe'\n              - '.hta'\n              - '.ps1'\n              - '.psm1'\n              - '.txt'\n              - '.vbe'\n              - '.vbs'\n              - '.zip'\n        - CommandLine|contains:\n              - '.7z\"'\n              - '.dat\"'\n              - '.dll\"'\n              - '.hta\"'\n              - '.ps1\"'\n              - '.psm1\"'\n              - '.txt\"'\n              - '.vbe\"'\n              - '.vbs\"'\n              - '.zip\"'\n    condition: all of selection_*\nfalsepositives:\n    - Unknown\nlevel: medium\nregression_tests_path: regression_data/rules/windows/process_creation/proc_creation_win_browsers_inline_file_download/info.yml\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1105","id":"T1105","name":"Ingress Tool Transfer","page":"techniques/enterprise/T1105/"}],"data_path":"data/detection-rules/94771a71-ba41-4b6e-a757-b531372eaab6.json","kind":"sigma"}