Split A File Into Pieces — Sigma Rule

Rule metadata and linked tags

Author: Igor Fits, Mikhail Larin, oscd.community. Source status: test; severity: low. Source dates: 2020-10-15 / 2021-11-27.

{
  "product": "macos",
  "category": "process_creation"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: df5ed43f04f3ddea9e24fb659428add34c744552ea65d6c274cc599974f2c123

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: Split A File Into Pieces
id: 7f2bb9d5-6395-4de5-969c-70c11fbe6b12
status: test
description: Detection use of the command "split" to split files into parts and possible transfer.
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1030/T1030.md
author: 'Igor Fits, Mikhail Larin, oscd.community'
date: 2020-10-15
modified: 2021-11-27
tags:
    - attack.exfiltration
    - attack.t1030
logsource:
    product: macos
    category: process_creation
detection:
    selection:
        Image|endswith: '/split'
    condition: selection
falsepositives:
    - Legitimate administrative activity
level: low

Original YAML and metadata in JSON

False positives

• Legitimate administrative activity

Source references

• https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1030/T1030.md