It seems the Linux version of the popular IRC server Unreal IRCd was contaminated with malware ever since November 2009, without anyone noticing it. The announcement was made on the Unreal IRCd forums:

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linuxlooooser's picture
Created by linuxlooooser 7 years 47 weeks ago
Category: High End   Tags:
TDTwister's picture


7 years 47 weeks 2 days 4 hours ago



A. Unreal IRCd is not a Linux only software is it?
B. Linux and software that run on Linux are two different things.

So Linux has nothing to to do with that software since it could infect any OS and is not part of Linux anyway.