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Detectionmediumtest

Powershell Store File In Alternate Data Stream

Storing files in Alternate Data Stream (ADS) similar to Astaroth malware.

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François HubautCreated Thu Sep 02Updated Sun Dec 25a699b30e-d010-46c8-bbd1-ee2e26765fe9windows
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_compspec:
        ScriptBlockText|contains|all:
            - 'Start-Process'
            - '-FilePath "$env:comspec" '
            - '-ArgumentList '
            - '>'
    condition: selection_compspec
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
a699b30e-d010-46c8-bbd1-ee2e26765fe9
Status
test
Level
medium
Type
Detection
Created
Thu Sep 02
Modified
Sun Dec 25
Author
François Hubaut
Path
rules/windows/powershell/powershell_script/posh_ps_store_file_in_alternate_data_stream.yml
Raw Tags
attack.defense-evasionattack.t1564.004
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