{"id":"4bf943c6-5146-4273-98dd-e958fd1e3abf","title":"Invoke-Obfuscation Obfuscated IEX Invocation","description":"Detects all variations of obfuscated powershell IEX invocation code generated by Invoke-Obfuscation framework from the following code block","author":"Daniel Bohannon (@Mandiant/@FireEye), oscd.community","status":"test","level":"high","date":"2019-11-08","modified":"2026-03-16","tags":["attack.stealth","attack.t1027","attack.execution","attack.t1059.001"],"technique_ids":["T1027","T1059.001"],"logsource":{"category":"process_creation","product":"windows"},"falsepositives":["Unknown"],"references":["https://github.com/danielbohannon/Invoke-Obfuscation/blob/f20e7f843edd0a3a7716736e9eddfa423395dd26/Out-ObfuscatedStringCommand.ps1#L873-L888"],"source_path":"rules/windows/process_creation/proc_creation_win_hktl_invoke_obfuscation_obfuscated_iex_commandline.yml","source_sha256":"420f6e1e15375b88b54297e270b67e8a80173c07afdd5dc009fc21e272c164db","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/process_creation/proc_creation_win_hktl_invoke_obfuscation_obfuscated_iex_commandline.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: Invoke-Obfuscation Obfuscated IEX Invocation\nid: 4bf943c6-5146-4273-98dd-e958fd1e3abf\nstatus: test\ndescription: Detects all variations of obfuscated powershell IEX invocation code generated by Invoke-Obfuscation framework from the following code block\nreferences:\n    - https://github.com/danielbohannon/Invoke-Obfuscation/blob/f20e7f843edd0a3a7716736e9eddfa423395dd26/Out-ObfuscatedStringCommand.ps1#L873-L888\nauthor: 'Daniel Bohannon (@Mandiant/@FireEye), oscd.community'\ndate: 2019-11-08\nmodified: 2026-03-16\ntags:\n    - attack.stealth\n    - attack.t1027\n    - attack.execution\n    - attack.t1059.001\nlogsource:\n    category: process_creation\n    product: windows\ndetection:\n    selection:\n        - CommandLine|re: '\\$PSHome\\[\\s*\\d{1,3}\\s*\\]\\s*\\+\\s*\\$PSHome\\['\n        - CommandLine|re: '\\$ShellId\\[\\s*\\d{1,3}\\s*\\]\\s*\\+\\s*\\$ShellId\\['\n        - CommandLine|re: '\\$env:Public\\[\\s*\\d{1,3}\\s*\\]\\s*\\+\\s*\\$env:Public\\['\n        - CommandLine|re: '\\$env:ComSpec\\[(?:\\s*\\d{1,3}\\s*,){2}'\n        - CommandLine|re: '\\*mdr\\*\\W\\s*\\)\\.Name'\n        - CommandLine|re: '\\$VerbosePreference\\.ToString\\('\n        - CommandLine|re: '\\[String\\]\\s*\\$VerbosePreference'\n    condition: selection\nfalsepositives:\n    - Unknown\nlevel: high\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1027","id":"T1027","name":"Obfuscated Files or Information","page":"techniques/enterprise/T1027/"},{"key":"enterprise/T1059.001","id":"T1059.001","name":"PowerShell","page":"techniques/enterprise/T1059.001/"}],"data_path":"data/detection-rules/4bf943c6-5146-4273-98dd-e958fd1e3abf.json","kind":"sigma"}