Binary Padding - Linux — Sigma Rule

Rule metadata and linked tags

Author: Igor Fits, oscd.community. Source status: test; severity: high. Source dates: 2020-10-13 / 2023-05-03.

{
  "product": "linux",
  "service": "auditd"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: b4bc9e39c6f8a27d59c7c7ceabd5cc404ef40db20badd32bfd7c78980c390674

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: Binary Padding - Linux
id: c52a914f-3d8b-4b2a-bb75-b3991e75f8ba
status: test
description: |
    Adversaries may use binary padding to add junk data and change the on-disk representation of malware.
    This rule detect using dd and truncate to add a junk data to file.
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1027.001/T1027.001.md
author: Igor Fits, oscd.community
date: 2020-10-13
modified: 2023-05-03
tags:
    - attack.stealth
    - attack.t1027.001
logsource:
    product: linux
    service: auditd
detection:
    selection_execve:
        type: 'EXECVE'
    keywords_truncate:
        '|all':
            - 'truncate'
            - '-s'
    keywords_dd:
        '|all':
            - 'dd'
            - 'if='
    keywords_filter:
        - 'of='
    condition: selection_execve and (keywords_truncate or (keywords_dd and not keywords_filter))
falsepositives:
    - Unknown
level: high
simulation:
    - type: atomic-red-team
      name: Pad Binary to Change Hash - Linux/macOS dd
      technique: T1027.001
      atomic_guid: ffe2346c-abd5-4b45-a713-bf5f1ebd573a

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1027.001/T1027.001.md