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Invoke-Obfuscation Via Use MSHTA - PowerShell

Detects Obfuscated Powershell via use MSHTA in Scripts

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Nikita Nazarov, oscd.communityCreated Thu Oct 08Updated Tue Nov 29e55a5195-4724-480e-a77e-3ebe64bd3759windows
Log Source
WindowsPowerShell Script
ProductWindows← raw: windows
CategoryPowerShell Script← raw: ps_script

Definition

Requirements: Script Block Logging must be enabled

Detection Logic
Detection Logic1 selector
detection:
    selection_4104:
        ScriptBlockText|contains|all:
            - 'set'
            - '&&'
            - 'mshta'
            - 'vbscript:createobject'
            - '.run'
            - '(window.close)'
    condition: selection_4104
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
Rule Metadata
Rule ID
e55a5195-4724-480e-a77e-3ebe64bd3759
Status
test
Level
high
Type
Detection
Created
Thu Oct 08
Modified
Tue Nov 29
Author
Nikita Nazarov, oscd.community
Path
rules/windows/powershell/powershell_script/posh_ps_invoke_obfuscation_via_use_mhsta.yml
Raw Tags
attack.defense-evasionattack.t1027attack.executionattack.t1059.001
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