Sigma rule: Antivirus PrinterNightmare CVE-2021-34527 Exploit Detection

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-46fe194d16d2, updated 2023-10-23T00:00:00.000Z.

Rule

Title
Antivirus PrinterNightmare CVE-2021-34527 Exploit Detection
Status
stable
Level
critical
Author
Sittikorn S, Nuttakorn T, Tim Shelton
Date
2021-07-01
Modified
2023-10-23
File
rules-emerging-threats/2021/Exploits/CVE-2021-1675/av_exploit_cve_2021_34527_print_nightmare.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects the suspicious file that is created from PoC code against Windows Print Spooler Remote Code Execution Vulnerability CVE-2021-34527 (PrinterNightmare), CVE-2021-1675 .

Log source

category
antivirus

Detection

selection:
    Filename|contains: ':\Windows\System32\spool\drivers\x64\'
keywords:
    - 'File submitted to Symantec' # symantec fp, pending analysis, more generic
condition: selection and not keywords

False positives (as the rule lists them)

  • Unlikely, or pending PSP analysis

Tags

  • attack.privilege-escalation
  • attack.stealth
  • attack.t1055
  • detection.emerging-threats
  • cve.2021-34527
  • cve.2021-1675

CVEs this rule names

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/rules-emerging-threats/2021/Exploits/CVE-2021-1675/av_exploit_cve_2021_34527_print_nightmare.yml

Sources and licences

  • SigmaHQ

    "Antivirus PrinterNightmare CVE-2021-34527 Exploit Detection" by Sittikorn S, Nuttakorn T, Tim Shelton (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules-emerging-threats/2021/Exploits/CVE-2021-1675/av_exploit_cve_2021_34527_print_nightmare.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: Antivirus PrinterNightmare CVE-2021-34527 Exploit Detection",
entity page, dataset version ref-46fe194d16d2, updated 2023-10-23T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/6fe1719e-ecdf-4caf-bffe-4f501cb0a561 (accessed 2026-11-03).
Underlying source: SigmaHQ rule 6fe1719e-ecdf-4caf-bffe-4f501cb0a561, 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.