Cyber criminals are relying on Remote Desktop Protocol (RDP) to compromise machines and sell access to them via underground markets.
These machines suffered a compromise because their owners failed to set strong RDP passwords, allowing the attackers to easily take them over.
A Russian website that goes by dedicatexpress.com said it can sell access to around 17,000 computers from all around the world, according to security journalist Brian Krebs.
Dedicatexpress.com offers its services to anyone who is willing to contact the owner via instant messaging and pay a registration fee of $20.
The prices for the actual hijacked servers vary depending on the machine’s performance and the length of time the user needs it.
It does appear some of the servers put up for sale are actually belong to Fortune 500 companies.