1200KM / sigma-rule
Decode Base64 Encoded Text — Sigma Rule
Sigma rule e2072cab-8c9a-459b-b63c-40ae79e27031. Decode Base64 Encoded Text — Sigma Rule. Detects usage of base64 utility to decode arbitrary base64-encoded text
Rule metadata and linked tags
Author: Daniil Yugoslavskiy, oscd.community. Source status: test; severity: low. Source dates: 2020-10-19 / 2021-11-27.
{
"category": "process_creation",
"product": "linux"
}Pinned original Sigma rule · Detection Rule License 1.1
Source SHA-256: 5f19210a426f49e15a3906295928895f4d5e81800f9eb5a2328ce973cfc50d48
Detection logic
Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.
title: Decode Base64 Encoded Text
id: e2072cab-8c9a-459b-b63c-40ae79e27031
status: test
description: Detects usage of base64 utility to decode arbitrary base64-encoded text
references:
- https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1027/T1027.md
author: Daniil Yugoslavskiy, oscd.community
date: 2020-10-19
modified: 2021-11-27
tags:
- attack.stealth
- attack.t1027
logsource:
category: process_creation
product: linux
detection:
selection:
Image|endswith: '/base64'
CommandLine|contains: '-d' # Also covers "--decode"
condition: selection
falsepositives:
- Legitimate activities
level: low
False positives
- Legitimate activities
Source references
Connected ecosystem references
Exact source-tagged techniques
Telemetry review
Read the original logsource above, then inspect the linked detection workspaces for technique-level sensor context. No per-rule telemetry equivalence is inferred.
Pinned research references. No browser attack runner, live simulation result or validated detector is asserted. Source mappings and validation limits are preserved. ATT&CK / Atomic provenance · Detection provenance.