Sigma rule: Potential CVE-2023-27997 Exploitation Indicators

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-ac4a363cd441, updated 2023-07-28T00:00:00.000Z.

Rule

Title
Potential CVE-2023-27997 Exploitation Indicators
Status
test
Level
medium
Author
Sergio Palacios Dominguez, Nasreddine Bencherchali (Nextron Systems)
Date
2023-07-28
File
rules-emerging-threats/2023/Exploits/CVE-2023-27997/web_cve_2023_27997_pre_authentication_rce.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects indicators of potential exploitation of CVE-2023-27997 in Frotigate weblogs.
To avoid false positives it is best to look for successive requests to the endpoints mentioned as well as weird values of the "enc" parameter

Log source

category
webserver

Detection

selection_uri:
    cs-method:
        - 'GET'
        - 'POST'
    cs-uri-query|contains:
        - '/remote/hostcheck_validate'
        - '/remote/logincheck'
selection_keywords:
    - 'enc='
condition: all of selection_*

False positives (as the rule lists them)

  • Unknown

Tags

  • attack.initial-access
  • attack.t1190
  • cve.2023-27997
  • 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/2023/Exploits/CVE-2023-27997/web_cve_2023_27997_pre_authentication_rce.yml

Sources and licences

  • SigmaHQ

    "Potential CVE-2023-27997 Exploitation Indicators" by Sergio Palacios Dominguez, Nasreddine Bencherchali (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules-emerging-threats/2023/Exploits/CVE-2023-27997/web_cve_2023_27997_pre_authentication_rce.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-2023-27997 Exploitation Indicators",
entity page, dataset version ref-ac4a363cd441, updated 2023-07-28T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/31e4e649-7394-4fd2-9ae7-dbc61eebb550 (accessed 2026-11-03).
Underlying source: SigmaHQ rule 31e4e649-7394-4fd2-9ae7-dbc61eebb550, 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.