THIS is why you pay for a AV like NOD, well especially NOD, a new rootkit found TODAY (21st) and NOD users are protected already due to its advanced scanning engine which detects possible issues BEFORE a specific update to target a virus.
Note the screenshot at the end which shows all the AV's tested and how many found the rootkit - interesting viewing for many on here i think.
I've attatched the relevant image in this post as well.