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Reformatting PC after virus - lingering issues?

SummaryJudgmentSummaryJudgment Grab the hottest iron you can find, stride in the Tower’s front doorRegistered User regular
edited January 23 in Help / Advice Forum
So recently my desktop PC (Windows 10) was infected with a virus that prompted me to reformat my machine and try and start fresh. I was getting hitching when web browsing and a fake McAfee ad popup in the corner of Firefox when I was browsing.

I backed up all of my files onto a USB stick, and used another USB stick to create a boot USB with Windows 11 on it using Windows' Media Creation Tool. I formatted my drive in the drive selection back to a single 2TB partition, deleting all the old partitions, and installed Windows 11 to my C: drive.

I uninstalled OneDrive, ran Windows Update until I had downloaded everything, and downloaded Firefox. I haven't returned the backed-up files in case that USB was infected. I downloaded and ran UserBenchmark and everything was in spec and looked fine. Games ran fine.

When accessing a webpage from Firefox's home page there's a good 3-4 second hitch when accessing a webpage and it's driving me crazy. Is there anything I can do to troubleshoot this? I'm starting from a clean format, essentially the same as if I had unboxed parts for a new build, and I can't imagine a virus persisting, but here I am. Firefox is also generally running like shit e.g. it's failing to terminate the process after I X out and when I later try to re-launch Firefox I get the warning message that another instance is running.

SummaryJudgment on

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  • BahamutZEROBahamutZERO Registered User regular
    edited January 23
    That is very sus. I don't know a lot about dealing with viruses that evade basic antivirus protection, but if it is actually such a virus, two possibilities for a virus persisting across a clean install occur to me, though there's probably plenty of other things I haven't thought of. The more likely idea is that the USB media you do have connected is infected and reinfecting your computer, especially if you created the windows media installation USB on the infected system. If it's a USB worm infection, running or moving files manually wouldn't be what spreads it, I have heard there are worms that can write themselves onto and off of USB storage without any user input.

    The other thing I can think of is that the BIOS is infected, but that's much, much less likely.

    BahamutZERO on
    BahamutZERO.gif
  • SummaryJudgmentSummaryJudgment Grab the hottest iron you can find, stride in the Tower’s front door Registered User regular
    @BahamutZERO Thanks for this -- after some testing it looks like it's specific to a banner ad running on these forums. Edge and Chrome handle it better, Firefox stutters on it for some reason. These are bone-stock browser installs so whatever adblock I had on Firefox on my previous build (I didn't think I was running one?) handled it more gracefully.

  • BahamutZEROBahamutZERO Registered User regular
    aha, mention that in the ad problem thread stickied in the bug report forum!

    BahamutZERO.gif
  • Inquisitor77Inquisitor77 2 x Penny Arcade Fight Club Champion A fixed point in space and timeRegistered User regular
    Firefox + uBlock Origin

    This is the way.

  • spool32spool32 Contrary Library Registered User, Transition Team regular
    All ads are sus. If you want to support PA, join Club PA and don't turn off ublock here!

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