In a recent blog post, the company revealed that it managed to take down as many 500,000 hijacked computers (bots) out of the 1.9 million strong ZeroAccess botnets.

This particular botnet is used in peer-to-peer command-and-control communication architecture. The lack of a central C&C server makes it impossible to disable an attacker and prevent it from spreading. As soon as it manages to get into a particular system, it contacts its peers and gives away details of other systems in the network. This constant communication between bots makes it extremely difficult to disable them.

In spite of all this, Symantec successfully found a way of sink holing the botnet. The team had been working on a method to take down the botnet since March but a report published by security researchers in May discussing the weakness prompted the ZeroAccess botmaster to upgrade the botnet for preventing the sinkhole.

Security experts warned that any benefits from the takedown might be short-lived. The cybercriminals behind the network are yet to be identified, said Symantec.


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