Sigma rule: Potential CVE-2023-36884 Exploitation - URL Marker

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-139bc25cfe88, updated 2023-07-12T00:00:00.000Z.

Rule

Title
Potential CVE-2023-36884 Exploitation - URL Marker
Status
test
Level
high
Author
X__Junior
Date
2023-07-12
File
rules-emerging-threats/2023/Exploits/CVE-2023-36884/proxy_exploit_cve_2023_36884_office_windows_html_rce_url_marker_traffic.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects a unique URL marker seen being used by RomCom potentially exploiting CVE-2023-36884

Log source

category
proxy

Detection

selection:
    cs-method: 'GET'
    c-uri|contains: '/MSHTML_C7/'
condition: selection

False positives (as the rule lists them)

  • Unknown

Tags

  • attack.command-and-control
  • cve.2023-36884
  • detection.emerging-threats

CVEs 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/2023/Exploits/CVE-2023-36884/proxy_exploit_cve_2023_36884_office_windows_html_rce_url_marker_traffic.yml

Sources and licences

  • SigmaHQ

    "Potential CVE-2023-36884 Exploitation - URL Marker" by X__Junior (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules-emerging-threats/2023/Exploits/CVE-2023-36884/proxy_exploit_cve_2023_36884_office_windows_html_rce_url_marker_traffic.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-2023-36884 Exploitation - URL Marker",
entity page, dataset version ref-139bc25cfe88, updated 2023-07-12T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/e59f71ff-c042-4f7a-8a82-8f53beea817e (accessed 2026-11-03).
Underlying source: SigmaHQ rule e59f71ff-c042-4f7a-8a82-8f53beea817e, 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.