Researchers help shut down spam botnet that enslaved 4,000 Linux machines

(A very old CBL logo.)

Click on over to ArsTechnica if you want to learn more about the specifics of this particular spamming botnet army. The interesting bit (for me, anyway) is that the infected machines monitored the Spamhaus CBL blacklist and would request removal if found to be listed. That's pretty amazing; does this count as the machines being alive? Joking aside, I wonder how one catches and notes these robotic blacklist removal requests.