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Trojan.Koredos Comes with an Unwelcomed Surprise

2011-03-11, Symantec
https://www.symantec.com/connect/blogs/trojankoredos-comes-unwelcomed-surprise
#3.4DDoS #Koredos #DDoS #Finance #Government

Contents

Recent Distributed Denial of Service (DDoS) attacks on a number South Korean websites have been in news for the past week. The threat responsible for carrying out these attacks is Trojan.Koredos.
This attack is reminiscent of another attack, launched on July 4th, 2009 against the U.S. and South Korean governments, as well as financial and media websites. For now, the attack has subsided and the affected sites can be accessed without any issues. However, the computers have not been cleaned for the Trojan.Koredos infection will be greeted with a surprise well after the initial infection, which we will detail in this blog.
Attacks such as this usually involve a command and control (C&C) server that sends commands to the compromised computers, resulting in systematic and coordinated attacks. In this case, the commands do not come from a C&C—they are hidden inside the threat.
There are many components involved in the attack, and that …