Cisco Talos is disclosing UAT-11795, a sophisticated, Russian-speaking, financially motivated adversary that has been conducting a malicious campaign targeting users in the U.S. and Europe since at least June 2025.
Cisco Talos discovered an intrusion, active since at least January 2026, where an unknown attacker implanted a CloudZ remote access tool (RAT) and a previously undocumented plugin called “Pheno.”
This blog will demonstrate the practice and methodology of reversing BugSleep’s protocol, writing a functional C2 server, and detecting this traffic with Snort.
