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Detection rules › Sigma

Split A File Into Pieces - Linux

Status
test
Severity
low
Log source
product linux, service auditd
Author
Igor Fits, oscd.community
Source
github.com/SigmaHQ/sigma

Detection use of the command "split" to split files into parts and possible transfer.

Known false positives

  • Legitimate administrative activity

MITRE ATT&CK coverage

TacticTechniques
Exfiltration

Telemetry coverage

PlatformRecord / event type
Linuxauditd SYSCALL record: System call event information

Rule body

title: Split A File Into Pieces - Linux
id: 2dad0cba-c62a-4a4f-949f-5f6ecd619769
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, oscd.community'
date: 2020-10-15
modified: 2022-11-28
tags:
    - attack.exfiltration
    - attack.t1030
logsource:
    product: linux
    service: auditd
detection:
    selection:
        type: 'SYSCALL'
        comm: 'split'
    condition: selection
falsepositives:
    - Legitimate administrative activity
level: low

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    type: 'SYSCALL'
    comm: 'split'

Indicators

These rows show field, operator, and value matches.

FieldKindValuesSearch
commeq
  • split
field:"comm" kind:eq value:"split"
typeeq
  • SYSCALL
field:"type" kind:eq value:"SYSCALL"