Possible Decode Base64 Encoded Text (via process_creation)

title: Possible Decode Base64 Encoded Text (via process_creation)
id: c575f0e8-b634-5a1d-acbc-25d7a9a9a4f1
status: stable
description: This rule detects use of base64 utility to decode arbitrary base64-encoded text
references:
    - https://attack.mitre.org/techniques/T1027/
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1027/T1027.md
author: Huntrule Team
date: 2026-01-14
tags:
    - attack.stealth
    - attack.t1027
logsource:
    category: process_creation
    product: linux
detection:
    selection:
        Image|endswith: '/base64'
        CommandLine|contains: '-d'
    condition: selection
falsepositives:
    - Unknown
level: low