Malware removes rival rootkits
Worm wars get stealthy
Miscreants have created a strain of malware capable of removing rootkits from compromised PCs, only to install almost undetectable backdoor code of its own.
The Pandex Trojan stops previously installed rootkits from working by removing their hooks into system calls. Pandex then installs its own rootkit component, detected by Trend Micro as Pushu-AC.
Full story: theregister.co.uk