I am a teacher in China, and students are always giving me ubs’s that often contain viruses.
I always scan them, and clean them, but I have a new virus that avast didn’t find.
you can send the password protected zip file to virus@avast.com with the subject “malware undetected by 4.8.1368” and the password, link to this topic.
or you can add the file to avast! chest and you can select email to avast option, do a manual update so that file is uploaded to avast! servers.
if the file which was not detected by avast!, was in a pen drive, then you probably cannot access the file unless you have the pen drive still with you.
@ the OP: not sure you got a virus at all there. Sounds like adware stuff and pop up triggered by cookies etc…no big deal. Clean your browser cache cookies and temp files, and you should be good.