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Protect your Linux servers from XorDdos, a botnet scanning the internet for SSH servers with weak passwords, Microsoft warns.

Microsoft has seen a 254% increase in activity over the past few months from XorDDoS, a roughly eight-year-old network of infected Linux machines that is used for distributed denial of service (DDoS) attacks.  

XorDdos conducts automated password-guessing attacks across thousands of Linux servers to find matching admin credentials used on Secure Shell (SSH) servers. SSH is a secure network communications protocol commonly used for remote system administration.