MediumSigmaHQ @Kostastsale

Potentially Suspicious Rundll32.EXE Execution of UDL File

Detects the execution of rundll32.exe with the oledb32.dll library to open a UDL file. Threat actors can abuse this technique as a phishing vector to capture authentication credentials or other sensitive data.

Detection logic

Detection requirements

Platform: ESXi Linux macOS Network Devices Windows
The rule states no platform. This is derived from the 2 ATT&CK techniques it maps to.
Log source product: windows
Log source category: process_creation

Known benign triggers

UDL files serve as a convenient and flexible tool for managing and testing database connections in various development and administrative scenarios.

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
trustedsec.com/blog/oops-i-udld-it-again	Unclassified	2from 2 sources

Detection rules

Potentially Suspicious Rundll32.EXE Execution of UDL File

Detection logic

Detection requirements

Known benign triggers

MITRE ATT&CK mappings

References

From the source

Licence

Authorship

Detection rules