HighSigmaHQ Cian Heasley

Webshell ReGeorg Detection Via Web Logs

Certain strings in the uri_query field when combined with null referer and null user agent can indicate activity associated with the webshell ReGeorg.

Detection logic

Detection requirements

Platform: Linux macOS Network Devices Windows
The rule states no platform. This is derived from the ATT&CK technique it maps to.
Log source category: webserver

Known benign triggers

Web applications that use the same URL parameters as ReGeorg

References

Links the source published beside this detection. Reference is the link the source wrote, unmodified. Class is decided by this catalogue from the host and path, not stated by the source. Cited by counts published detections citing the same resource, including this one, and the sources beneath it count the repositories this catalogue ingests, which is not the same as independent research.
Reference	Class	Cited by
community.rsa.com/community/products/netwitness/blog/2019/02/19/web-shells-and-netwitness-part-3	Unclassified	Only this detection cites it
github.com/sensepost/reGeorg	Tool	Only this detection cites it

Detection rules

Webshell ReGeorg Detection Via Web Logs

Detection logic

Detection requirements

Known benign triggers

MITRE ATT&CK mappings

References

From the source

Licence

Authorship

Detection rules