Sigma rule: Potential SystemNightmare Exploitation Attempt

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-33e4fbc37d0b, updated 2023-02-04T00:00:00.000Z.

Rule

Title
Potential SystemNightmare Exploitation Attempt
Status
test
Level
critical
Author
Florian Roth (Nextron Systems)
Date
2021-08-11
Modified
2023-02-04
File
rules-emerging-threats/2021/Exploits/SystemNightmare-Exploit/proc_creation_win_exploit_other_systemnightmare.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects an exploitation attempt of SystemNightmare in order to obtain a shell as LOCAL_SYSTEM

Log source

product
windows
category
process_creation

Detection

selection:
    CommandLine|contains:
        - 'printnightmare.gentilkiwi.com'
        - ' /user:gentilguest '
        - 'Kiwi Legit Printer'
condition: selection

False positives (as the rule lists them)

  • Unknown

Tags

  • attack.privilege-escalation
  • attack.t1068
  • detection.emerging-threats

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/SystemNightmare-Exploit/proc_creation_win_exploit_other_systemnightmare.yml

Sources and licences

  • SigmaHQ

    "Potential SystemNightmare Exploitation Attempt" by Florian Roth (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules-emerging-threats/2021/Exploits/SystemNightmare-Exploit/proc_creation_win_exploit_other_systemnightmare.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 SystemNightmare Exploitation Attempt",
entity page, dataset version ref-33e4fbc37d0b, updated 2023-02-04T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/c01f7bd6-0c1d-47aa-9c61-187b91273a16 (accessed 2026-11-03).
Underlying source: SigmaHQ rule c01f7bd6-0c1d-47aa-9c61-187b91273a16, 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.