Sigma rule: Potential CVE-2021-4034 Exploitation Attempt

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-40e4396af482, updated 2023-03-24T00:00:00.000Z.

Rule

Title
Potential CVE-2021-4034 Exploitation Attempt
Status
unsupported
Level
high
Author
Pawel Mazur
Date
2022/01/27
Modified
2023/03/24
File
unsupported/linux/lnx_auditd_cve_2021_4034.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects exploitation attempt of the vulnerability described in CVE-2021-4034.

Log source

product
linux
service
auditd

Detection

selection_proctitle:
    type: PROCTITLE
    proctitle: '(null)'
selection_syscall:
    type: SYSCALL
    comm: pkexec
    exe: '/usr/bin/pkexec'
condition: selection_proctitle |near selection_syscall

False positives (as the rule lists them)

  • Unknown

Tags

  • attack.privilege_escalation
  • attack.t1068

MITRE ATT&CK ids this rule names

References

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/unsupported/linux/lnx_auditd_cve_2021_4034.yml

Sources and licences

  • SigmaHQ

    "Potential CVE-2021-4034 Exploitation Attempt" by Pawel Mazur (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/unsupported/linux/lnx_auditd_cve_2021_4034.yml.
    Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License

    Detection Rule License (DRL) 1.1

Cite this page

Dragons Eye Ransomware Tracker, "Sigma rule: Potential CVE-2021-4034 Exploitation Attempt",
entity page, dataset version ref-40e4396af482, updated 2023-03-24T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/40a016ab-4f48-4eee-adde-bbf612695c53 (accessed 2026-11-03).
Underlying source: SigmaHQ rule 40a016ab-4f48-4eee-adde-bbf612695c53, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.