Sigma rule: Potential CVE-2023-36884 Exploitation - Share Access

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-881876e28a43, updated 2023-07-13T00:00:00.000Z.

Rule

Title
Potential CVE-2023-36884 Exploitation - Share Access
Status
test
Level
high
Author
Nasreddine Bencherchali (Nextron Systems)
Date
2023-07-13
File
rules-emerging-threats/2023/Exploits/CVE-2023-36884/win_security_exploit_cve_2023_36884_office_windows_html_rce_share_access_pattern.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects access to a file share with a naming schema seen being used during exploitation of CVE-2023-36884

Log source

product
windows
service
security
definition
The advanced audit policy setting "Object Access > Audit File Share" must be configured for Success/Failure

Detection

selection_eid:
    EventID: 5140
selection_share_name:
    ShareName|contains: '\MSHTML_C7\'
    ShareName|re: '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}'
selection_share_path:
    ShareLocalPath|contains: '\MSHTML_C7\'
    ShareLocalPath|re: '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}'
condition: selection_eid and 1 of selection_share_*

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/win_security_exploit_cve_2023_36884_office_windows_html_rce_share_access_pattern.yml

Sources and licences

  • SigmaHQ

    "Potential CVE-2023-36884 Exploitation - Share Access" by Nasreddine Bencherchali (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules-emerging-threats/2023/Exploits/CVE-2023-36884/win_security_exploit_cve_2023_36884_office_windows_html_rce_share_access_pattern.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 - Share Access",
entity page, dataset version ref-881876e28a43, updated 2023-07-13T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/3df95076-9e78-4e63-accb-16699c3b74f8 (accessed 2026-11-03).
Underlying source: SigmaHQ rule 3df95076-9e78-4e63-accb-16699c3b74f8, 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.