Botnet Uses 100,000 IPs in Massive RDP Attack Wave
🛡️ GreyNoise researchers uncovered a massive RDP attack wave using more than 100,000 IP addresses across over 100 countries, which analysts link to a single large botnet targeting U.S. Remote Desktop infrastructure. The attackers used two enumeration techniques — an RD Web Access timing attack to infer valid usernames and an RDP Web Client login enumeration to guess credentials — enabling efficient compromise while reducing obvious alerts. GreyNoise published a dynamic blocklist template, microsoft-rdp-botnet-oct-25, and recommends that organizations review logs for unusual RDP access patterns and automatically block associated IPs at the network edge.
