Researchers have found Java-based malware that is capable of infecting Windows, Mac OS X, and Linux systems. The malware exploits a known flaw in Java 7 u21 and earlier for which Oracle released a patch in June 2013. The malware communicates with an Internet relay chat channel that serves as a command-and-control server. The network of computers compromised by this malware is used to launch distributed denial-of-service (DDoS) attacks.
[Editor's Note (Ullrich): Not only does this malware run on different operating systems, but it is also smart enough to add itself as an auto-start program on each operating system.]