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Symlink Etc Passwd — Sigma Rule

Sigma rule c67fc22a-0be5-4b4f-aad5-2b32c4b69523. Symlink Etc Passwd — Sigma Rule. Detects suspicious command lines that look as if they would create symbolic links to /etc/passwd

Rule metadata and linked tags

testhighlinuxattack.t1204.001attack.execution

Author: Florian Roth (Nextron Systems). Source status: test; severity: high. Source dates: 2019-04-05 / 2021-11-27.

{
  "product": "linux"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 7f44b24b0be3827ef3ad79a994780a3cce90f26100a5aab3c335a77fc2dfe745

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: Symlink Etc Passwd
id: c67fc22a-0be5-4b4f-aad5-2b32c4b69523
status: test
description: Detects suspicious command lines that look as if they would create symbolic links to /etc/passwd
references:
    - https://www.qualys.com/2021/05/04/21nails/21nails.txt
author: Florian Roth (Nextron Systems)
date: 2019-04-05
modified: 2021-11-27
tags:
    - attack.t1204.001
    - attack.execution
logsource:
    product: linux
detection:
    keywords:
        - 'ln -s -f /etc/passwd'
        - 'ln -s /etc/passwd'
    condition: keywords
falsepositives:
    - Unknown
level: high

Original YAML and metadata in JSON

False positives

  • Unknown

Source references

Connected ecosystem references

Exact source-tagged techniques

Telemetry review

Read the original logsource above, then inspect the linked detection workspaces for technique-level sensor context. No per-rule telemetry equivalence is inferred.

Pinned research references. No browser attack runner, live simulation result or validated detector is asserted. Source mappings and validation limits are preserved. ATT&CK / Atomic provenance · Detection provenance.