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Detectionmediumtest

Gzip Archive Decode Via PowerShell

Detects attempts of decoding encoded Gzip archives via PowerShell.

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Launch
Hieu TranCreated Mon Mar 1398767d61-b2e8-4d71-b661-e36783ee24c1windows
Log Source
WindowsProcess Creation
ProductWindows← raw: windows
CategoryProcess Creation← raw: process_creation

Events generated when a new process is spawned on the system. Covers command-line arguments, parent/child relationships, and process metadata.

Detection Logic
Detection Logic1 selector
detection:
    selection:
        CommandLine|contains|all:
            - 'GZipStream'
            - '::Decompress'
    condition: selection
False Positives

Legitimate administrative scripts may use this functionality. Use "ParentImage" in combination with the script names and allowed users and applications to filter legitimate executions

References
1
Resolving title…
zscaler.com
MITRE ATT&CK
Rule Metadata
Rule ID
98767d61-b2e8-4d71-b661-e36783ee24c1
Status
test
Level
medium
Type
Detection
Created
Mon Mar 13
Author
Hieu Tran
Path
rules/windows/process_creation/proc_creation_win_powershell_decode_gzip.yml
Raw Tags
attack.command-and-controlattack.t1132.001
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