{"id":"850d55f9-6eeb-4492-ad69-a72338f65ba4","title":"C# IL Code Compilation Via Ilasm.EXE","description":"Detects the use of \"Ilasm.EXE\" in order to compile C# intermediate (IL) code to EXE or DLL.","author":"frack113, Nasreddine Bencherchali (Nextron Systems)","status":"test","level":"medium","date":"2022-05-07","modified":"2022-05-16","tags":["attack.execution","attack.stealth","attack.t1127"],"technique_ids":["T1127"],"logsource":{"product":"windows","category":"process_creation"},"falsepositives":["Unknown"],"references":["https://lolbas-project.github.io/lolbas/Binaries/Ilasm/","https://www.echotrail.io/insights/search/ilasm.exe"],"source_path":"rules/windows/process_creation/proc_creation_win_ilasm_il_code_compilation.yml","source_sha256":"34e7ef61d405f0d343ce3e5c1ec89293b1f4f9709252b563aff5a2aad49a7016","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/process_creation/proc_creation_win_ilasm_il_code_compilation.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: C# IL Code Compilation Via Ilasm.EXE\nid: 850d55f9-6eeb-4492-ad69-a72338f65ba4\nstatus: test\ndescription: Detects the use of \"Ilasm.EXE\" in order to compile C# intermediate (IL) code to EXE or DLL.\nreferences:\n    - https://lolbas-project.github.io/lolbas/Binaries/Ilasm/\n    - https://www.echotrail.io/insights/search/ilasm.exe\nauthor: frack113, Nasreddine Bencherchali (Nextron Systems)\ndate: 2022-05-07\nmodified: 2022-05-16\ntags:\n    - attack.execution\n    - attack.stealth\n    - attack.t1127\nlogsource:\n    product: windows\n    category: process_creation\ndetection:\n    selection_img:\n        - Image|endswith: '\\ilasm.exe'\n        - OriginalFileName: 'ilasm.exe'\n    selection_cli:\n        CommandLine|contains:\n            - ' /dll'\n            - ' /exe'\n    condition: all of selection_*\nfalsepositives:\n    - Unknown\nlevel: medium\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1127","id":"T1127","name":"Trusted Developer Utilities Proxy Execution","page":"techniques/enterprise/T1127/"}],"data_path":"data/detection-rules/850d55f9-6eeb-4492-ad69-a72338f65ba4.json","kind":"sigma"}