{"id":"4aa6040b-3f28-44e3-a769-9208e5feb5ec","title":"Suspicious Rundll32 Execution With Image Extension","description":"Detects the execution of Rundll32.exe with DLL files masquerading as image files","author":"Hieu Tran","status":"test","level":"high","date":"2023-03-13","modified":"","tags":["attack.stealth","attack.t1218.011"],"technique_ids":["T1218.011"],"logsource":{"category":"process_creation","product":"windows"},"falsepositives":["Unknown"],"references":["https://www.zscaler.com/blogs/security-research/onenote-growing-threat-malware-distribution"],"source_path":"rules/windows/process_creation/proc_creation_win_rundll32_susp_execution_with_image_extension.yml","source_sha256":"0151fec558c75e1ed85d017e46d71f679c8b6247d4aba4eff747d799987e8ed4","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/process_creation/proc_creation_win_rundll32_susp_execution_with_image_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 Rundll32 Execution With Image Extension\nid: 4aa6040b-3f28-44e3-a769-9208e5feb5ec\nrelated:\n    - id: 089fc3d2-71e8-4763-a8a5-c97fbb0a403e\n      type: similar\nstatus: test\ndescription: Detects the execution of Rundll32.exe with DLL files masquerading as image files\nreferences:\n    - https://www.zscaler.com/blogs/security-research/onenote-growing-threat-malware-distribution\nauthor: Hieu Tran\ndate: 2023-03-13\ntags:\n    - attack.stealth\n    - attack.t1218.011\nlogsource:\n    category: process_creation\n    product: windows\ndetection:\n    selection_img:\n        - Image|endswith: '\\rundll32.exe'\n        - OriginalFileName: 'RUNDLL32.exe'\n    selection_cli:\n        CommandLine|contains:\n            - '.bmp'\n            - '.cr2'\n            - '.eps'\n            - '.gif'\n            - '.ico'\n            - '.jpeg'\n            - '.jpg'\n            - '.nef'\n            - '.orf'\n            - '.png'\n            - '.raw'\n            - '.sr2'\n            - '.tif'\n            - '.tiff'\n    condition: all of selection_*\nfalsepositives:\n    - Unknown\nlevel: high\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1218.011","id":"T1218.011","name":"Rundll32","page":"techniques/enterprise/T1218.011/"}],"data_path":"data/detection-rules/4aa6040b-3f28-44e3-a769-9208e5feb5ec.json","kind":"sigma"}