Sigma rule: Potential CVE-2022-26809 Exploitation Attempt

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-3ec431bd2208, updated 2023-02-03T00:00:00.000Z.

Rule

Title
Potential CVE-2022-26809 Exploitation Attempt
Status
test
Level
high
Author
Florian Roth (Nextron Systems)
Date
2022-04-13
Modified
2023-02-03
File
rules-emerging-threats/2022/Exploits/CVE-2022-26809/proc_creation_win_exploit_cve_2022_26809_rpcss_child_process_anomaly.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects suspicious remote procedure call (RPC) service anomalies based on the spawned sub processes (long shot to detect the exploitation of vulnerabilities like CVE-2022-26809)

Log source

product
windows
category
process_creation

Detection

selection:
    ParentImage: 'C:\Windows\System32\svchost.exe'
    ParentCommandLine|contains: '-k RPCSS'
condition: selection

False positives (as the rule lists them)

  • Unknown
  • Some cases in which the service spawned a werfault.exe process

Tags

  • attack.initial-access
  • attack.t1190
  • attack.execution
  • attack.t1569.002
  • cve.2022-26809
  • 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/2022/Exploits/CVE-2022-26809/proc_creation_win_exploit_cve_2022_26809_rpcss_child_process_anomaly.yml

Sources and licences

  • SigmaHQ

    "Potential CVE-2022-26809 Exploitation Attempt" by Florian Roth (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules-emerging-threats/2022/Exploits/CVE-2022-26809/proc_creation_win_exploit_cve_2022_26809_rpcss_child_process_anomaly.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-2022-26809 Exploitation Attempt",
entity page, dataset version ref-3ec431bd2208, updated 2023-02-03T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/a7cd7306-df8b-4398-b711-6f3e4935cf16 (accessed 2026-11-03).
Underlying source: SigmaHQ rule a7cd7306-df8b-4398-b711-6f3e4935cf16, 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.