Commands to Clear or Remove the Syslog - Builtin — Sigma Rule

Rule metadata and linked tags

Author: Max Altgelt (Nextron Systems). Source status: test; severity: high. Source dates: 2021-09-10 / 2022-11-26.

{
  "product": "linux"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 9a4013f7037340a2112e055eacab73835174eaa0faa940bbb0fba681934f5e12

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: Commands to Clear or Remove the Syslog - Builtin
id: e09eb557-96d2-4de9-ba2d-30f712a5afd3
status: test
description: Detects specific commands commonly used to remove or empty the syslog
references:
    - https://www.virustotal.com/gui/file/fc614fb4bda24ae8ca2c44e812d12c0fab6dd7a097472a35dd12ded053ab8474
author: Max Altgelt (Nextron Systems)
date: 2021-09-10
modified: 2022-11-26
tags:
    - attack.impact
    - attack.t1565.001
logsource:
    product: linux
detection:
    selection:
        - 'rm /var/log/syslog'
        - 'rm -r /var/log/syslog'
        - 'rm -f /var/log/syslog'
        - 'rm -rf /var/log/syslog'
        - 'mv /var/log/syslog'
        - ' >/var/log/syslog'
        - ' > /var/log/syslog'
    falsepositives:
        - '/syslog.'
    condition: selection and not falsepositives
falsepositives:
    - Log rotation
level: high

Original YAML and metadata in JSON

False positives

• Log rotation

Source references

• https://www.virustotal.com/gui/file/fc614fb4bda24ae8ca2c44e812d12c0fab6dd7a097472a35dd12ded053ab8474