On The Fly Malware Boot Scan !

I'm a little confused

You opened a .bat file("right click on it and choose Open")....which is the same as executing it....and it ran it's batch routine....which is a normal occurence....given how you said you did it.

What the advice givers failed to add was the part about using a text editor such as Notepad to view the plain text that's contained in a batch file such as Autoexec.bat.

 

It didn't really "bypass" your bios password. Your bios password is necessary right around POST time, so since you executed the batch file from within Windows, the bios password had long since been entered.

Pretty much. It just checked the files running in Windows memory, probably.

Sort of. But the whole point of the scan is for it to run BEFORE Windows has a chance to load. That's when you can nail a lot of nasties, and why things like F-PROT for DOS, Avast! (under NT flavors), as well as the "reboot" scans found in Adaware and SBSD work the way they do.

Not really, because everything has loaded already. You're just doing a quick check of files that AVG is targeting at boot-time, and possibly a memory check.

That's why something like a password or ChipAway is a good idea.

 

thats one of the best things that i find in avast-the boottime malware scan

 

I totally agree! Wish more AV's had this functionality.

 

What you saw wasn't an "instant boot scan", it was you running a DOS application within Windows, and having the application run in full-screen mode, without warning, with the resolution (most likely) changing at the same time.

I did the same thing some time during 1989, I think it was.