{"id":"1b9dc62e-6e9e-42a3-8990-94d7a10007f7","title":"Invoke-Obfuscation Obfuscated IEX Invocation - PowerShell","description":"Detects all variations of obfuscated powershell IEX invocation code generated by Invoke-Obfuscation framework from the following code block \\u2014","author":"Daniel Bohannon (@Mandiant/@FireEye), oscd.community","status":"test","level":"high","date":"2019-11-08","modified":"2022-12-31","tags":["attack.stealth","attack.t1027","attack.execution","attack.t1059.001"],"technique_ids":["T1027","T1059.001"],"logsource":{"product":"windows","category":"ps_script","definition":"Requirements: Script Block Logging must be enabled"},"falsepositives":["Unknown"],"references":["https://github.com/danielbohannon/Invoke-Obfuscation/blob/f20e7f843edd0a3a7716736e9eddfa423395dd26/Out-ObfuscatedStringCommand.ps1#L873-L888"],"source_path":"rules/windows/powershell/powershell_script/posh_ps_invoke_obfuscation_obfuscated_iex.yml","source_sha256":"ce79163e40d3dc678df73d0a20776b0e4426d6fe58f1a5f762bae4e116c40a5b","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/powershell/powershell_script/posh_ps_invoke_obfuscation_obfuscated_iex.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 - PowerShell\nid: 1b9dc62e-6e9e-42a3-8990-94d7a10007f7\nstatus: test\ndescription: Detects all variations of obfuscated powershell IEX invocation code generated by Invoke-Obfuscation framework from the following code block \\u2014\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: 2022-12-31\ntags:\n    - attack.stealth\n    - attack.t1027\n    - attack.execution\n    - attack.t1059.001\nlogsource:\n    product: windows\n    category: ps_script\n    definition: 'Requirements: Script Block Logging must be enabled'\ndetection:\n    selection_iex:\n        - ScriptBlockText|re: '\\$PSHome\\[\\s*\\d{1,3}\\s*\\]\\s*\\+\\s*\\$PSHome\\['\n        - ScriptBlockText|re: '\\$ShellId\\[\\s*\\d{1,3}\\s*\\]\\s*\\+\\s*\\$ShellId\\['\n        - ScriptBlockText|re: '\\$env:Public\\[\\s*\\d{1,3}\\s*\\]\\s*\\+\\s*\\$env:Public\\['\n        - ScriptBlockText|re: '\\$env:ComSpec\\[(\\s*\\d{1,3}\\s*,){2}'\n        - ScriptBlockText|re: '\\*mdr\\*\\W\\s*\\)\\.Name'\n        - ScriptBlockText|re: '\\$VerbosePreference\\.ToString\\('\n    condition: selection_iex\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/1b9dc62e-6e9e-42a3-8990-94d7a10007f7.json","kind":"sigma"}