OS = Windows 7 When I visit a site like youtube whith private browsing enabled and with the add-on named "shockwave flash" in firefox add-on list installed and activate the flashplayer by going to a video the following files are created in the folder C:\Users\MyUserName\AppData\Local\Temp\plugtmp-1 plugin-crossdomain.xml plugin-strings-nl_NL-vflLqJ7vu.xlb The contents of plugin-crossdomain contain both the "youtube.com" adress as "s.ytimg.com" and is as follows: <?xml version="1.0"?> <!DOCTYPE cross-domain-policy SYSTEM "http://www.macromedia.com/xml/dtds/cross-domain-policy.dtd"> -<cross-domain-policy> <allow-access-from domain="s.ytimg.com"/> <allow-access-from domain="*.youtube.com"/> </cross-domain-policy> The contents of the other file I will spare you cause I think those are less common when I visit other sites but I certainly don't trust the file. The crossdomain.xml I see when I visit most other flashpayer sites as well. I've also noticed multiple plugin-crossdomain-1.xml and onwards in numbers, I just clicked a youtube video to test, got 6 of them in my temp plus a file named "plugin-read2" (no more NL file cause I changed my country, don't know how youtube knows where I'm from, but that's another subject, don't like that either). I just noticed one with a different code: <?xml version="1.0"?> -<cross-domain-policy> <allow-access-from domain="*"/> </cross-domain-policy> So I guess this one comprimises my browsing history a bit less since it doesn't contain a webadress. If these files are even meant to be deposited in my local\temp folder. The bigger problem occurs when they stay there even after using private browsing, after clearing history, after clearing internet temporary files, cache, whatever you can think of. Which they do in my case, got more than 50 plugtmp-# folders in the previous mentioned local\temp folder containing all website names I visited in the last months. There are a variety of files in them, mostly ASP and XML, some just say file. I have yet to witness such a duplicate folder creation since I started checking my temp (perhaps when firefox crashes? I'd say I've had about 50 crashes in recent months). I started checking my temp because of the following Microsoft Security Essential warnings I received on 23-4-12: Exploit:Java/CVE-2010-0840.HE containerfile:C:\Users\Username\AppData\Local\Temp\jar_cache2196625541034777730.tmp file:C:\Users\Username\AppData\Local\Temp\jar_cache2196625541034777730.tmp->pong/reversi.class and... Exploit:Java/CVE-2008-5353.ZT containerfile:C:\Users\Noname\AppData\Local\Temp\jar_cache1028270176376464057.tmp file:C:\Users\Noname\AppData\Local\Temp\jar_cache1028270176376464057.tmp->Testability.class Microsoft Security Essentials informed me that these files were quarantained and deleted but when going to my temp file they were still there, I deleted them manually and began the great quest of finding out what the multiple gigabytes of other files and folders were doing in that temp folder and not being deleted with the usual clearing options within firefox (and IE). Note that I have set my adobe flasplayer settings to the most private intense I could think of while doing these tests (don't allow data storage for all websites, disable peer-to peer stuff, don't remember exactly anymore, etc.). I found it highly suspicious that i needed to change these settings online on an adobe website, is that correct? When right-clicking a video only limited privacy options are available which is why I tried the website thing. After the inital discovery of the java exploit (which was discovered by MSE shortly after I installed and started my first scan with Malwarebytes, which in turn made me suspicious whether I had even downloaded the right malwarebytes, but no indication in the filename if I google it). Malwarebytes found nothing, MSE found nothing after it said it removed the files, yet it didn't remove them, manually scanning these jar_cache files with both malwarevytes and MSE resulted in nothing. Just to be sure, I deleted them anyways like I said earlier. No new jar_cache files have been created, no exploits detected since then. CCleaner has cleaned most of my temp folder, I did the rest, am blocking all cookies (except for now shortly), noscript add-on has been running a while on my firefox (V 3.6.26) to block most javascripts except from sites like youtube. I've had almost the same problem using similar manual solutions a couple of months ago, and a couple of months before that (clearing all the multiple tmp folders, removing or renaming jar_cache manually, running various antmalware software, full scan not finding a thing afterwards, installing extra add-ons to increase my security, this time it's BetterPrivacy which I found through a mozilla firefox https connection, I hope, which showed me nicely how adobe flash was still storing LSO's even after setting all storage settings to 0 kb and such on the adobe website, enabling private browsing in firefox crushed those little trolls, but still plugtmp trolls are being created, help me crush them please, they confuse me when I'm looking for a real threat but I still want to use flash, IE doesn't need those folders and files, or does it store them somewhere else?). I'm sorry for the long story and many questions, hope it doesn't scare you away from helping me fight this. I suspect it's people wanting to belong to the hackergroup Anonymous who are doing this to my system and repeating their tricks (or the virus is still there, but I've done many antivirus scans with different programs so no need to suggest that option to me, they don't find it or I run into it after a while again, so far, have not seen jar_cache show up). Obviously, you may focus on the questions pertaining firefox and plugtmp folders, but if you can help me with any information regarding those exploits I would be extremely grateful, I've read alot but there isn't much specific information for checking where it comes from when all the anti-virus scanners don't detect anything anymore and don't block it incoming. I also have downloaded and installed process monitor but it crashes when I try to run it. The first time I tried to run it it lasted the longest, now it crashes after a few seconds, I just saw the number of events run up to almost a million and lots of cpu usage. When it crashed everything returned back to normal, or at least that's what I'm supposed to think I guess. I'll follow up on that one on their forum, but you can tell me if the program is ligit or not (it has a microsoft digital signature, or the name micosoft is used in that signature).