Suspicious Gzip Archive Decode Through PowerShell (via process_creation)

title: Suspicious Gzip Archive Decode Through PowerShell (via process_creation)
id: d7bfeea9-b973-52c7-96fb-23dde5c5403e
status: stable
description: This rule detects attempts of decoding encoded Gzip archives via PowerShell.
references:
    - https://attack.mitre.org/techniques/T1132/001/
    - https://www.zscaler.com/blogs/security-research/onenote-growing-threat-malware-distribution
author: Huntrule Team
date: 2026-06-08
tags:
    - attack.command-and-control
    - attack.t1132.001
logsource:
    product: windows
    category: process_creation
detection:
    selection:
        CommandLine|contains|all:
            - 'GZipStream'
            - '::Decompress'
    condition: selection
falsepositives:
    - Unknown
level: medium