Sigma rule: CVE-2023-23397 Exploitation Attempt

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-5da760b87c01, updated 2023-03-22T00:00:00.000Z.

Rule

Title
CVE-2023-23397 Exploitation Attempt
Status
test
Level
critical
Author
Robert Lee @quantum_cookie
Date
2023-03-16
Modified
2023-03-22
File
rules-emerging-threats/2023/Exploits/CVE-2023-23397/win_security_exploit_cve_2023_23397_outlook_remote_file_query.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects outlook initiating connection to a WebDAV or SMB share, which could be a sign of CVE-2023-23397 exploitation.

Log source

product
windows
service
security
definition
Requirements: SACLs must be enabled for "Query Value" on the registry keys used in this rule

Detection

selection:
    EventID:
        - 4656
        - 4663
    ProcessName|endswith: '\OUTLOOK.EXE'
    # Example: \REGISTRY\MACHINE\SYSTEM\CurrentControlSet001\Services\WebClient\NetworkProvider
    ObjectName|contains|all:
        - '\REGISTRY\MACHINE\SYSTEM'
        - 'Services\'
    ObjectName|endswith:
        - 'WebClient\NetworkProvider'
        - 'LanmanWorkstation\NetworkProvider'
    AccessList|contains: '%%4416' # "Query key value"
condition: selection

False positives (as the rule lists them)

  • Searchprotocolhost.exe likes to query these registry keys. To avoid false postives, it's better to filter out those events before they reach the SIEM

Tags

  • attack.credential-access
  • attack.initial-access
  • cve.2023-23397
  • 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-2023-23397/win_security_exploit_cve_2023_23397_outlook_remote_file_query.yml

Sources and licences

  • SigmaHQ

    "CVE-2023-23397 Exploitation Attempt" by Robert Lee @quantum_cookie (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules-emerging-threats/2023/Exploits/CVE-2023-23397/win_security_exploit_cve_2023_23397_outlook_remote_file_query.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: CVE-2023-23397 Exploitation Attempt",
entity page, dataset version ref-5da760b87c01, updated 2023-03-22T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/73c59189-6a6d-4b9f-a748-8f6f9bbed75c (accessed 2026-11-03).
Underlying source: SigmaHQ rule 73c59189-6a6d-4b9f-a748-8f6f9bbed75c, 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.