There is discussions on this issue at Avast! forum as you may have notice and one thing they said is it could be false positive but to ensure it is or not, it is suggested by them to scan the file by uploading to virustotal.com and do not delete the found item but put into chest only until you've confirmed it's not FP.
Can you still get that exe file and send it for single file scan at http://www.virustotal.com/
I seem to ahve a problem with a virus or multiple virusses. I ahve Windows XP Pro. With latest version of avast home 4.8. It picked up the trojan or both of them at the same time,one keeps on creating folders with a "MaAad.gif" file in my Content.IE5 folder, and the other one keeps poping up in Documents and Settings folder and is called "sUddxsate.exe".
I have deleted, moved to chest, rename and move and try to clean with avast, downloaded and scanned with Malwarebytes, Super Anti Spyware, McAfee. The first two found a few suprising things, but did not solve the problem. Full scans on both of them. I have now downlaoded Spyware Blaster and Ccleaner and will work with these as well and try to see if they do anything, thought that I'll post now incase anyone has any other idea's? The previously emntined software I got from discussions on here, so thanks for the help thus far.