No mention of Windows?
Where does Microsoft Windows come into the equation?
The crooks behind the Pushdo botnet agent have developed variants of the malware that are more resistant to take-down attempts or hijacking by rival hackers. Dell SecureWorks and Damballa warned (PDF) on Wednesday that the latest variant of Pushdo comes packed with a fallback mechanism for cases where zombie clients are unable …
but just trying to detect and remove the new malware is becoming more and more difficult - it is coming to a point where only the best blended defenses will help keep that crud off the computer in the first place. However, even clicking on bad email attachments have been averted by some of Windows defensive features. It is getting where a honey pot lab can be a dull place - unless you purposely blow through the UAC and other protections on the way to testing the latest and greatest anti-malware utility.
NT5 and the old smoldy XP are just about toast though - that OS is about totally defenseless now.