Cisco Clear Logs — Sigma Rule

Rule metadata and linked tags

Author: Austin Clark. Source status: test; severity: high. Source dates: 2019-08-12 / 2023-05-26.

{
  "product": "cisco",
  "service": "aaa"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 655ce0e30c36935ceebc58675bfe1fa4f733188c5351ff899f3007f960cbe7b3

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: Cisco Clear Logs
id: ceb407f6-8277-439b-951f-e4210e3ed956
status: test
description: Clear command history in network OS which is used for defense evasion
references:
    - https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5000/sw/command/reference/sysmgmt/n5k-sysmgmt-cr/n5k-sm_cmds_c.html
    - https://www.cisco.com/c/en/us/td/docs/ios/12_2sr/12_2sra/feature/guide/srmgtint.html#wp1127609
author: Austin Clark
date: 2019-08-12
modified: 2023-05-26
tags:
    - attack.stealth
    - attack.t1070.003
logsource:
    product: cisco
    service: aaa
detection:
    keywords:
        - 'clear logging'
        - 'clear archive'
    condition: keywords
falsepositives:
    - Legitimate administrators may run these commands
level: high

Original YAML and metadata in JSON

False positives

• Legitimate administrators may run these commands

Source references

• https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5000/sw/command/reference/sysmgmt/n5k-sysmgmt-cr/n5k-sm_cmds_c.html
• https://www.cisco.com/c/en/us/td/docs/ios/12_2sr/12_2sra/feature/guide/srmgtint.html#wp1127609