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45 lines
1.4 KiB
YAML
45 lines
1.4 KiB
YAML
action: global
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title: Invoke-Obfuscation Obfuscated IEX Invocation
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id: 51aa9387-1c53-4153-91cc-d73c59ae1ca9
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description: "Detects all variations of obfuscated powershell IEX invocation code generated by Invoke-Obfuscation framework from the following code block \u2014 https://github.com/danielbohannon/Invoke-Obfuscation/blob/master/Out-ObfuscatedStringCommand.ps1#L873-L888"
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status: experimental
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author: Daniel Bohannon (@Mandiant/@FireEye), oscd.community
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date: 2019/11/08
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tags:
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- attack.defense_evasion
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- attack.t1027
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falsepositives:
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- Unknown
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level: high
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detection:
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selection_1:
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- ImagePath|re: '\$PSHome\[\s*\d{1,3}\s*\]\s*\+\s*\$PSHome\['
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- ImagePath|re: '\$ShellId\[\s*\d{1,3}\s*\]\s*\+\s*\$ShellId\['
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- ImagePath|re: '\$env:Public\[\s*\d{1,3}\s*\]\s*\+\s*\$env:Public\['
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- ImagePath|re: '\$env:ComSpec\[(\s*\d{1,3}\s*,){2}'
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- ImagePath|re: '\*mdr\*\W\s*\)\.Name'
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- ImagePath|re: '\$VerbosePreference\.ToString\('
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- ImagePath|re: '\String\]\s*\$VerbosePreference'
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condition: selection and selection_1
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---
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logsource:
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product: windows
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service: system
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detection:
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selection:
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EventID: 7045
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---
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logsource:
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product: windows
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category: driver_load
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detection:
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selection:
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EventID: 6
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---
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logsource:
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product: windows
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service: security
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detection:
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selection:
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EventID: 4697
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