Sigma rule: Potential PrintNightmare Exploitation Attempt

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-3b1d7b3a280a, updated 2023-02-17T00:00:00.000Z.

Rule

Title
Potential PrintNightmare Exploitation Attempt
Status
test
Level
high
Author
Bhabesh Raj
Date
2021-07-01
Modified
2023-02-17
File
rules-emerging-threats/2021/Exploits/CVE-2021-1675/file_delete_win_exploit_cve_2021_1675_print_nightmare.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detect DLL deletions from Spooler Service driver folder. This might be a potential exploitation attempt of CVE-2021-1675

Log source

product
windows
category
file_delete

Detection

selection:
    Image|endswith: '\spoolsv.exe'
    TargetFilename|contains: 'C:\Windows\System32\spool\drivers\x64\3\'
condition: selection

False positives (as the rule lists them)

  • Unknown

Tags

  • attack.persistence
  • attack.privilege-escalation
  • attack.execution
  • attack.stealth
  • attack.t1574
  • cve.2021-1675
  • detection.emerging-threats

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/file_delete_win_exploit_cve_2021_1675_print_nightmare.yml

Sources and licences

  • SigmaHQ

    "Potential PrintNightmare Exploitation Attempt" by Bhabesh Raj (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules-emerging-threats/2021/Exploits/CVE-2021-1675/file_delete_win_exploit_cve_2021_1675_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: Potential PrintNightmare Exploitation Attempt",
entity page, dataset version ref-3b1d7b3a280a, updated 2023-02-17T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/5b2bbc47-dead-4ef7-8908-0cf73fcbecbf (accessed 2026-11-03).
Underlying source: SigmaHQ rule 5b2bbc47-dead-4ef7-8908-0cf73fcbecbf, 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.