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Detectionhightest

Invoke-Obfuscation VAR+ Launcher - PowerShell Module

Detects Obfuscated use of Environment Variables to execute PowerShell

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Jonathan Cheong, oscd.communityCreated Thu Oct 15Updated Fri Apr 056bfb8fa7-b2e7-4f6c-8d9d-824e5d06ea9ewindows
Log Source
WindowsPowerShell Module
ProductWindows← raw: windows
CategoryPowerShell Module← raw: ps_module

Definition

0ad03ef1-f21b-4a79-8ce8-e6900c54b65b

Detection Logic
Detection Logic1 selector
detection:
    selection_4103:
        Payload|re: 'cmd.{0,5}(?:/c|/r)(?:\s|)"set\s[a-zA-Z]{3,6}.*(?:\{\d\}){1,}\\"\s+?-f(?:.*\)){1,}.*"'
    condition: selection_4103
False Positives
Unknown

False positive likelihood has not been assessed. Additional context may be needed during triage.

References
1
Resolving title…
github.com
MITRE ATT&CK
Related Rules
DerivedDetectionhigh

Invoke-Obfuscation VAR+ Launcher - PowerShell

Detects Obfuscated use of Environment Variables to execute PowerShell

This rule was derived from the related rule - both detect similar activity with different scope.

Rule Metadata
Rule ID
6bfb8fa7-b2e7-4f6c-8d9d-824e5d06ea9e
Status
test
Level
high
Type
Detection
Created
Thu Oct 15
Modified
Fri Apr 05
Author
Jonathan Cheong, oscd.community
Path
rules/windows/powershell/powershell_module/posh_pm_invoke_obfuscation_var.yml
Raw Tags
attack.defense-evasionattack.t1027attack.executionattack.t1059.001
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