Hmmm, I see we helped you back in
February with a similar problem (except no one worked your log -
sorry about that). I note back then I recommended you check out the
Cleaning Out Malware sticky and I assume that is where you picked up MBAM you mentioned above. Note in that sticky is also included steps to clean your system of clutter with ATF, CCleaner, or Disk Cleanup. As Vectris said, this sounds like temp files.
If you set your defenses using that sticky as a guide to build your own suite, AND you (and every user of that computer) have been
practicing safe computing since February, then I suspect you got it with MBAM.
However, the rootkit is surely a concern - even if reported removed by MBAM, which I have a lot of faith in. If you had a virus back in February, and rootkits now, then there is a breach in your computer's defenses. It is not being kept patched, updated, scanned or blocked as needed, or you or another user of that machine, have not been diligent at
practicing safe computing.
I think you need to review that sticky and make sure your defenses are covered. Ensure all users of that PC understand where they can go, and more importantly, where they cannot go. The best defense cannot succeed if the weakest link, the user, lets the badguys in. Make sure all users are fully aware that downloading songs and movies from P2P sites that allow illegal filesharing of copyrighted materials is (1) illegal and (2) just about the best way to defeat all the computer's defenses and infect system with spyware and remote control access to use as a weapon against the rest of us.
Since your log was not analyzed in February, then I agree again with Vectris, a log would be a good idea, just to be safe. I recommend you post a log then leave that computer alone until one of WTT's Malware Removal experts can assist you. Note the sticky in that forum if not you have no response in 5 days.
If you need that computer for productivity work, then I would urge you to run one of those disk cleaners, update and scan with MBAM again, then post your log. Make no other changes to your system until someone there helps you. See
WhattheTech HijackThis Log Procedures for complete instructions on running HijackThis, then post a log where instructed. Please refer to this post so they can catch up. When the HJT analysts give you a clean bill of health, please post back here with an update.
That said, I am not sure there was a problem with those seemingly randomly generated files. Similar files to the ones you note are often created in temporary folders to temporarily store configuration data and compressed/decompressed files during a program install. A good programmer would ensure the install routine cleans up after itself, but if that process is interrupted, perhaps by a firewall, or user terminating the install, they may be left behind. Downloaded files are often temporarily downloaded to temp folders while the system waits for the user to input the correct save location. If a download is terminated prematurely, it may leave such files. All the more reason to do regular disk cleanups.
