{"id":"fc4f4817-0c53-4683-a4ee-b17a64bc1039","title":"Suspicious Desktopimgdownldr Target File","description":"Detects a suspicious Microsoft desktopimgdownldr file creation that stores a file to a suspicious location or contains a file with a suspicious extension","author":"Florian Roth (Nextron Systems)","status":"test","level":"high","date":"2020-07-03","modified":"2022-06-02","tags":["attack.command-and-control","attack.t1105"],"technique_ids":["T1105"],"logsource":{"product":"windows","category":"file_event"},"falsepositives":["False positives depend on scripts and administrative tools used in the monitored environment"],"references":["https://labs.sentinelone.com/living-off-windows-land-a-new-native-file-downldr/","https://twitter.com/SBousseaden/status/1278977301745741825"],"source_path":"rules/windows/file/file_event/file_event_win_susp_desktopimgdownldr_file.yml","source_sha256":"737a364c9839d5fa8e48ba934283566a86502f868df0869558f90804bdb48d9e","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/file/file_event/file_event_win_susp_desktopimgdownldr_file.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 Desktopimgdownldr Target File\nid: fc4f4817-0c53-4683-a4ee-b17a64bc1039\nstatus: test\ndescription: Detects a suspicious Microsoft desktopimgdownldr file creation that stores a file to a suspicious location or contains a file with a suspicious extension\nreferences:\n    - https://labs.sentinelone.com/living-off-windows-land-a-new-native-file-downldr/\n    - https://twitter.com/SBousseaden/status/1278977301745741825\nauthor: Florian Roth (Nextron Systems)\ndate: 2020-07-03\nmodified: 2022-06-02\ntags:\n    - attack.command-and-control\n    - attack.t1105\nlogsource:\n    product: windows\n    category: file_event\ndetection:\n    selection:\n        Image|endswith: '\\svchost.exe'\n        TargetFilename|contains: '\\Personalization\\LockScreenImage\\'\n    filter1:\n        TargetFilename|contains: 'C:\\Windows\\'\n    filter2:\n        TargetFilename|contains:\n            - '.jpg'\n            - '.jpeg'\n            - '.png'\n    condition: selection and not filter1 and not filter2\nfalsepositives:\n    - False positives depend on scripts and administrative tools used in the monitored environment\nlevel: high\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/fc4f4817-0c53-4683-a4ee-b17a64bc1039.json","kind":"sigma"}