Sigma rule: ADSelfService Exploitation

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-6e1400d19a2e, updated 2023-01-02T00:00:00.000Z.

Rule

Title
ADSelfService Exploitation
Status
test
Level
high
Author
Tobias Michalski (Nextron Systems), Max Altgelt (Nextron Systems)
Date
2021-09-20
Modified
2023-01-02
File
rules-emerging-threats/2021/Exploits/CVE-2021-40539/web_cve_2021_40539_adselfservice.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects suspicious access to URLs that was noticed in cases in which attackers exploitated the ADSelfService vulnerability CVE-2021-40539

Log source

category
webserver

Detection

selection:
    cs-uri-query|contains:
        - '/help/admin-guide/Reports/ReportGenerate.jsp'
        - '/ServletApi/../RestApi/LogonCustomization'
        - '/ServletApi/../RestAPI/Connection'
condition: selection

False positives (as the rule lists them)

  • Unknown

Tags

  • cve.2021-40539
  • detection.emerging-threats
  • attack.initial-access
  • attack.t1190

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-2021-40539/web_cve_2021_40539_adselfservice.yml

Sources and licences

  • SigmaHQ

    "ADSelfService Exploitation" by Tobias Michalski (Nextron Systems), Max Altgelt (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules-emerging-threats/2021/Exploits/CVE-2021-40539/web_cve_2021_40539_adselfservice.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: ADSelfService Exploitation",
entity page, dataset version ref-6e1400d19a2e, updated 2023-01-02T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/6702b13c-e421-44cc-ab33-42cc25570f11 (accessed 2026-11-03).
Underlying source: SigmaHQ rule 6702b13c-e421-44cc-ab33-42cc25570f11, 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.