{"id":"b447f7de-1e53-4cbf-bfb4-f1f6d0b04e4e","title":"Suspicious Binaries and Scripts in Public Folder","description":"Detects the creation of a file with a suspicious extension in the public folder, which could indicate potential malicious activity.","author":"The DFIR Report","status":"experimental","level":"high","date":"2025-01-23","modified":"","tags":["attack.execution","attack.t1204"],"technique_ids":["T1204"],"logsource":{"category":"file_event","product":"windows"},"falsepositives":["Administrators deploying legitimate binaries to public folders."],"references":["https://intel.thedfirreport.com/events/view/30032","https://intel.thedfirreport.com/eventReports/view/70","https://thedfirreport.com/2025/01/27/cobalt-strike-and-a-pair-of-socks-lead-to-lockbit-ransomware/"],"source_path":"rules/windows/file/file_event/file_event_win_susp_public_folder_extension.yml","source_sha256":"a583bf93dcc6c4df34fbb396eac7a63d3f234bde8af05d74b37d22703929e6b0","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/file/file_event/file_event_win_susp_public_folder_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 Binaries and Scripts in Public Folder\nid: b447f7de-1e53-4cbf-bfb4-f1f6d0b04e4e\nstatus: experimental\ndescription: Detects the creation of a file with a suspicious extension in the public folder, which could indicate potential malicious activity.\nreferences:\n    - https://intel.thedfirreport.com/events/view/30032 # Private Report\n    - https://intel.thedfirreport.com/eventReports/view/70 # Private Report\n    - https://thedfirreport.com/2025/01/27/cobalt-strike-and-a-pair-of-socks-lead-to-lockbit-ransomware/\nauthor: 'The DFIR Report'\ndate: 2025-01-23\ntags:\n    - attack.execution\n    - attack.t1204\nlogsource:\n    category: file_event\n    product: windows\ndetection:\n    selection:\n        TargetFilename|contains: ':\\Users\\Public\\'\n        TargetFilename|endswith:\n            - '.bat'\n            - '.dll'\n            - '.exe'\n            - '.hta'\n            - '.js'\n            - '.ps1'\n            - '.vbe'\n            - '.vbs'\n    condition: selection\nfalsepositives:\n    - Administrators deploying legitimate binaries to public folders.\nlevel: high\nregression_tests_path: regression_data/rules/windows/file/file_event/file_event_win_susp_public_folder_extension/info.yml\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1204","id":"T1204","name":"User Execution","page":"techniques/enterprise/T1204/"}],"data_path":"data/detection-rules/b447f7de-1e53-4cbf-bfb4-f1f6d0b04e4e.json","kind":"sigma"}