Alright, I've been having a rather unusual issue so I'll be very thorough and detailed about what's happened and what measures I have taken. I'm sorry for the large text in advance.
Using Windows 7 with Microsoft Security Essentials. Issue first spotted in Google Chrome with adblock plus.
- I tried to connect to a website and it seemed to be down (rest of internet worked fine as usual)
- Several hours later I refreshed and the website loaded again, but something seemed weird with the layout and strange symbols. (as I later figured it was mainly due to an embedded youtube being broken/weird)
- At this time I went to youtube directly and found out that the layout for the entire html page/text was broken and the same weird symbols were popping up.
- It finally came to me that some of the symbols are just enlarged buttons from the youtube player that was broken for whatever reason. You can see some of these here: http://i.imgur.com/ytvgtzI.png
- If I click the play button there for example then another area appears. I am not sure if this is to do with (normally) hidden draw areas but it's basically the first of the following images, except if I hoover the mouse over certain areas and it will appear as the second. First: http://i.imgur.com/RYCU0TF.png Second: http://i.imgur.com/hWbZPyz.png
- I thought it could be to do with flash although that shouldn't affect page layout, and youtube mainly uses html5 these days so it could be to do with that but at that point I figured it might be time to run a virus scan.
- Microsoft Security Essentials scans and finds 0 problems.
- I downloaded Malwarebytes Anti-Malware to run a scan with that. Please note that before this I have not downloaded a single file to my computer in several weeks.
- Malwarebytes Anti-Malware scans and finds 0 problems.
- I search around on Chrome a bit and discover that on certain websites embedded youtube videos still look and function as normal. I guess there are two different types of embedded youtube videos.
- I tried googling for any issues, but unfortunately it's almost impossible to find anything related to youtube or google as these words are simply far too common.
- I tried opening Internet Explorer to see if the issue is present there. In Internet Explorer youtube works perfectly fine so my issue is Chrome related.
- At this stage I restarted Chrome but that did not change anything.
- Afterwards I thought to reboot my computer, however I decided to install windows updates first in case some of the updates could help with my issues.
Troubleshooting when things get complicated
- All windows updates installed, but youtube is still broken when I open Chrome.
- I try running Microsoft Security Essentials again and it gets stuck after a while on a notable file: chrome.exe !
- Since that didn't work I tried scanning with Malwarebytes again which found 0 problems still.
- At some point I opened a tab in my browser and got a small warning pop-up from Malwarebytes Anti-Malware stating something was blocked to do with clickadu.com !
- I have googled for something to do with a virus there, and did find some bad things related to it, but all of it seems a lot different from my situation so it seems unwise to follow those steps.
- At a later stage after another attempt to find something with MBAM the scanner gets stuck after a while.
- Here I unplugged the ethernet cable and disconnect from the internet to see if that affects the scans.
- At this point I run both MSE and MBAM scans and without being connected to the internet neither of them gets stuck. They both scan as normal but find 0 problems.
Trying some different programs
- Since neither of these suites seem able to pinpoint what the problem is or help me find out exactly what I'm dealing with I tried out some other programs.
- AdwCleaner finds a few issues in - AppData\Local\Google\Chrome\User Data\Default\Local Storage\ - some files with the words chatango.com and olark.com stand out ! (can attach logs if wanted)
- Again as with clickadu before I can find some negatives related to these names but nothing like my issue. I don't have any weird ads or pop-ups, only the issue with youtube.
- I ran FRST64.exe afterwards but I think I'm not supposed to post those logs here. I am just noting that I did run that program at this point and I could provide logs when desired.
- At this point I tried ESET Online Scanner through Internet Explorer which seemed to get stuck early on similar to MBAM.
- Since I was busy for a while I left it running instead of aborting and it did proceed again eventually even though it seemed to get stuck forever on certain files.
- (as I am writing this down now I'd like to point out I have a very powerful computer and until this stage I didn't experience and slowing down of my system)
- I am aware that it might be very bad to remove files at a bad stage, and unfortunately ESET Online Scanner did find ONE single problem and deleted that right away without asking for my input. Namely: - C:\Users\workstation\Downloads\ccsetup419.exe Win32/Bundled.Toolbar.Google.D potentially unsafe application deleted -
- At this stage I suddenly noticed that some programs started to freeze up, I guess as a consequence of the deleted file which triggered something else.
- Although the programs did respond again after a few minutes it was a scary turn of events so I rebooted again to try some basic scans again, in case they would now actually find something.
- Booting into Safe mode MSE & MBAM scan and still find nothing.
- Booting normally and WITH internet MSE gets stuck after approximately 17 minutes.
- Unlike before it's not on Chrome.exe no more but it will repeatedly get stuck somewhere in C:\Windows\winsxs\Backup (not always on the same file though)
- MBAM scan will still start to get stuck on files after a few minutes only to go through a few more. Eventually even if I leave it running a couple of hours it just stays stuck.
- I rebooted again and discovered if I run an MBAM scan even with internet it will scan and not find any issues. Only AFTER running MSE and getting it stuck, will MBAM scans get frozen.
This is about where I'm at now. I haven't the feinted idea what's wrong, but despite most scans finding nothing there's more than enough indications that there is some sort of virus or malware present or I would have simply tried reinstalling Google Chrome. I checked the browser extensions and there are no unknown extensions there.
I have never really had a virus myself before, but I have used resources in forums like these in the past to help other people remove viruses and malware. I am kind of suspicious that most likely the site I mentioned at the start uses some bad advertisement companies and despite running adblock plus I somehow got a virus that was served through an ad.
I do really appreciate if someone here could spare some time to help out. I can understand it might take a while for a reaction, but in case I get a swift response I'll just state for clarity I will go to sleep now and I might not have much time tomorrow to respond tomorrow either, but I will subscribe to this topic and if someone responds I will see what I can do!