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HighSigmaHQ Josh Brower @DefensiveDepth

Publicly Accessible RDP Service

Detects connections from routable IPs to an RDP listener. Which is indicative of a publicly-accessible RDP service.

Detection logic

Detection requirements

Platform: Windows
The rule states no platform. This is derived from the ATT&CK technique it maps to.
Log source product: zeek
Log source service: rdp

Known benign triggers

Although it is recommended to NOT have RDP exposed to the internet, verify that this is a) allowed b) the server has not already been compromised via some brute force or remote exploit since it has been exposed to the internet. Work to secure the server if you are unable to remove it from being exposed to the internet.

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