Here the story ( by a translator ):
netCoder, a group of developers of cheats rotting Punkbuster. To discern cheats, Punkbuster scanne the physical memory of your PC by searching some chaines characters being supposed to be used by cheats.
netCoder identifies some of these character strings: they did not have more than to go on IRC and to write some lines so that the chain of character meets in the memory of all guys linked on the channel.
Those who played so get banned from servers for "cheating".