sigmahighHunting

Invoke-Obfuscation Obfuscated IEX Invocation - PowerShell

Detects all variations of obfuscated powershell IEX invocation code generated by Invoke-Obfuscation framework from the following code block \u2014

MITRE ATT&CK

T1027 T1059.001

defense-evasionexecution

Detection Query

selection_iex:
  - ScriptBlockText|re: \$PSHome\[\s*\d{1,3}\s*\]\s*\+\s*\$PSHome\[
  - ScriptBlockText|re: \$ShellId\[\s*\d{1,3}\s*\]\s*\+\s*\$ShellId\[
  - ScriptBlockText|re: \$env:Public\[\s*\d{1,3}\s*\]\s*\+\s*\$env:Public\[
  - ScriptBlockText|re: \$env:ComSpec\[(\s*\d{1,3}\s*,){2}
  - ScriptBlockText|re: \*mdr\*\W\s*\)\.Name
  - ScriptBlockText|re: \$VerbosePreference\.ToString\(
condition: selection_iex

Author

Daniel Bohannon (@Mandiant/@FireEye), oscd.community

Created

2019-11-08

Data Sources

windowsps_script

Platforms

windows

References

https://github.com/danielbohannon/Invoke-Obfuscation/blob/f20e7f843edd0a3a7716736e9eddfa423395dd26/Out-ObfuscatedStringCommand.ps1#L873-L888

Tags

attack.defense-evasionattack.t1027attack.executionattack.t1059.001

Raw Content

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