How can I be certain that my machine is clean?

General Topics
1

I had the koobface virus and had been running symantec antivirus. I started running Avast and the problem seemed to go away and then come back. I uninstalled symantec and ran Avast several times, both at and after boot. The logs keep coming back telling me that there are no virus’ but I am concerned that if it is not really clean and i log into systems using that machine, those id’s and passwords might get stolen. it has been about a week since the last koobface event on that machine. thanks in advance for your help.

2

post this in the " virus and worm " forum

the malware remover essexboy is working there now

3

The Norton Removal Tool uninstalls all Norton 2003-2010 products from your computer.

  1. (If possible) Remove Symantec products through Add/Remove programs from Control Panel. Boot.
  2. Use Norton Removal Tool for Windows 2000/XP/Vista/7 or Norton Removal Tool for Windows 98/Me. Boot.
  3. Install avast! (or repair the installation) and boot.

Then, I suggest:

  1. Clean your temporary files.
  2. Schedule a boot time scanning with avast with archive scanning turned on. If avast does not detect it, you can try DrWeb CureIT! instead.
  3. Use MBAM (or SUPERantispyware or even Spyware Terminator) to scan for spywares and trojans. If any infection is detected, better and safer is send the file to Quarantine than to simple delete them.
  4. Test your machine with anti-rootkit applications. I suggest avast! antirootkit or Trend Micro RootkitBuster.
  5. Make a HijackThis log to post here or this analysis site. Or even submit the RunScanner log to to on-line analysis.
  6. Clean your Hosts file (replacing it) with HostsMan tool.
  7. Disable System Restore and then reenable it again.
  8. Immunize your system with SpywareBlaster.
  9. Check if you have insecure applications with Secunia Software Inspector.