I was viewing a flash in IE7, since I've got enough tabs open in firefox that doing anything complicated with flash will crash it.
A flash banner ad opened a popup, which was bad enough, but then I got a popup outside of the browser, then a new icon in the system tray, then errors whenever I tried to open programs, as well as UAC elevation requests from the trojan.
It would close the task manager as soon as I opened it, so I had to log out and back in to catch it before it was running. Poking around in msconfig revealed its startup entry (in AppData/Local/[random string of letters]) which I nuked.
This box seems to be clean, but now I can't type a password on it until I reformat it.
Thanks, e621.
If you want me to disable adblock in firefox, perhaps you should try not infecting your users with spyware?
Updated by luvdaporn