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The recent surge in e-mail spam hawking penny stocks and - 20 inches less and you are a Queen - pills is the handiwork of Russian hackers running a botnet powered by tens of thousands of hijacked computers.
Internet security researchers and law enforcement authorities have traced the operation to a well-organized hacking gang controlling a 70,000-strong peer-to-peer botnet seeded with the SpamThru Trojan.
According to Joe Stewart, senior security researcher at SecureWorks, in Atlanta, the gang functions with a level of sophistication rarely seen in the hacking underworld.
For starters, the Trojan comes with its own anti-virus scanner—a pirated copy of Kaspersky's security software—that removes competing malware files from the hijacked machine. Once a Windows machine is infected, it becomes a peer in a peer-to-peer botnet controlled by a central server. If the control server is disabled by botnet hunters, the spammer simply has to control a single peer to retain control of all the bots and send instructions on the location of a new control server.
The bots are segmented into different server ports, determined by the variant of the Trojan installed, and further segmented into peer groups of no more than 512 bots. This allows the hackers to keep the overhead involved in exchanging information about other peers to a minimum, Stewart explained.
Internet security researchers and law enforcement authorities have traced the operation to a well-organized hacking gang controlling a 70,000-strong peer-to-peer botnet seeded with the SpamThru Trojan.
According to Joe Stewart, senior security researcher at SecureWorks, in Atlanta, the gang functions with a level of sophistication rarely seen in the hacking underworld.
For starters, the Trojan comes with its own anti-virus scanner—a pirated copy of Kaspersky's security software—that removes competing malware files from the hijacked machine. Once a Windows machine is infected, it becomes a peer in a peer-to-peer botnet controlled by a central server. If the control server is disabled by botnet hunters, the spammer simply has to control a single peer to retain control of all the bots and send instructions on the location of a new control server.
The bots are segmented into different server ports, determined by the variant of the Trojan installed, and further segmented into peer groups of no more than 512 bots. This allows the hackers to keep the overhead involved in exchanging information about other peers to a minimum, Stewart explained.