So the story is; I moved abroad not long time ago, and since I couldn't take my desktop PC with me I installed Windows 10 on a partition in the HDD of the Macbook via Bootcamp. Some weeks ago I started getting very annoying adds on Chrome (addblock was on btw, no other plug-ins were active), these adds would come in any form and in any webpage, it could be new windows or tabs that popped out, it could redirect me from any website or link I searched or clicked. It would also come in the form of bold words in sites that I was visiting that suddenly turned into links if I clicked them, or even if I clicked anywhere else it would redirect me to comercial website and there were also floating adds overlaying any damn page. As you can imagine it was pretty maddening, so I uninstalled Chrome, installed avast, did some scans on my laptop, deleted some malware files and it looked like it was ok. Time later and now using Microsoft Edge (since I only use Win10 for gaming and social networking), I started having the same problem, so I proceeded to use avast to scan my computer again but this time nothing was found. So I thought "well, since I only need Windows for gaming, I wont use any web browser and I'll just open Steam and games", and so I did. But for the last days I am getting this damn adds on Steam, in it's web-browser and on the store, and sometimes they take up all the window so I can't even close them and I have to restart the program. Sorry for the long post, has anybody any experience with a case like this? Any help is appreciated.
Could be some sort of virus spreading through your network? I've got little to no idea. But I do know that Steam's store is actually just a browser running in disguise.
Sounds like Malware / DNS hijack, download and run the following free tools that are commonly used. http://www.bleepingcomputer.com/download/rkill/ (kills known junk running processes so you can run other tools) http://www.bleepingcomputer.com/download/tdsskiller/ (checks for rootkits, etc) http://www.bleepingcomputer.com/download/junkware-removal-tool/ (malware removal) http://www.bleepingcomputer.com/download/adwcleaner/ (malware removal) http://www.bleepingcomputer.com/download/malwarebytes-anti-malware/ (malware removal)
I'm not sure about it, independently the network I'm connected to I get the problem, and the people I share the network with aren't having any trouble. Could it be that the virus is located inside the hard drive but outside the partition (thus in Mac OS X) and attacking the Windows 10 partition? Thank you for your answer by the way. Thanks so much Syclopse, I'm gonna try it right away! I'll post later the results.
are the steam add highlited? and mostly apear in the store/ steam groups? ive had these little bastards before. luckily i restored to an earlier back up
Syclopse offered some good links there, I would suggest trying MalwareBytes Anti-Malware, They give a 30 day full trial for free meaning you can leave it to do a proper scan. I've been using the paid version myself for a few years and it's done a pretty good job at keeping me safe. You could possibly try HijackThis, http://www.majorgeeks.com/files/details/trend_micro_hijackthis.html run it and save a log and post it here or PM it I can take a quick look but can't promise I'll be able to spot anything. Just don't delete anything with the program as you could damage your system making it unstable. Lastly, You could try HouseCall (http://housecall.trendmicro.com/), It's an online Anti-Virus and it could possibly detect something Avast isn't.
MBAM is certainly the first step to take. Your best bet with troublesome malware that MBAM or similar won't remove is to post on the Malwarebytes forum following their instructions, where you'll get someone talk you through the steps to take.
To be honest, I think a clean reinstall of an OS would be in order. Even if you could remove some of the malware, I wouldn't trust the state of the system since there is no guarantee that backdoors or vulnerabilities don't still exist. But regardless of what action you take, you should still review how you got the problem in the first place. Most of the time I hear about these issues, it's with people installing really sketchy 3rd party software or whatnot.
I had similar issues. This should help fast and simple (please don't think like i'm trying to advertise this tool, it's really helped me in difficult situation when traditional antivirus tools were useless): https://toolslib.net/downloads/viewdownload/1-adwcleaner/
Two free Microsoft tools that I have used: Microsoft Emergency Support Response Tool (remove viruses, spyware, and other malicious software). Microsoft Windows Malicious Software Removal Tool
Another tool, that can help if antivirus and adwcleaner does nothing, but pc is still obviously infected (like infected "svchost" process). https://www.malwarebytes.org/antirootkit/