So I had something very unusual happen with Smart Security over the weekend. When I got to my PC yesterday afternoon, the ESS icon was still spinning like it was scanning the PC. I found this odd since the scan starts at 3am and it only has two SSDs to scan. ESS opened normally, and showed the scanning screen normally, where it appeared to be stuck on a file (in a Windows Python distro for Blender, had been on PC long time already). Clicking the pause button, etc. failed to stop or restart the scan. I rebooted the PC and scanned the PC manually, nothing unusual was found. This morning when I got to the PC, I got an alert saying ESS was not able to update its virus signatures. I tried clearing the cache, etc., but it continued to die when updating. I checked the box for the beta or pre-release signatures, and started the update again. It downloaded a lot of new stuff, but also failed to update successfully. The update would die around 7 or 8 of 10 steps, in what appeared to be a data unpacking and applying stage rather than a downloading stage. At this point I uninstalled the ESS beta and installed ESS 5. It installed properly, updated without any trouble, and I ran a quick memory and boot sector scan with nothing found. I then set it for a full scan and went about working. After a few minutes ESS starting popping up warnings about files in memory and the disk being infected with Kryptik.AMQ. One of the infected files was in the ESET program directory, and so was one of the files in memory. ESS was unable to delete the files or quarantine them. At this point I pulled the power and intended to boot from a rescue CD to check the system with an uncompromised source. Unfortunately it did not boot from the CD as intended, and Windows booted to the login screen while I was out of the room. So, it's possible ESS deleted any infected files at boot. I rebooted with rescue CDs. Running complete scans with both Avira and Kaspersky rescue CDs yielded no infections. Rebooting into Windows and scanning again with ESS 5 yields no infections. I am concerned, however, because the ESS threat log does not show that all of the infected files were deleted. They no longer appear in the locations given, but I'm skeptical. I've been unable to identify the vector by which the virus would have entered the system. All downloads are saved on a networked share and a scan of it yields nothing infected. The only thing I've downloaded or installed recently was a game patch for Tropico 4, and that was downloaded directly by the game. There is only one other Windows PC on the network, and it scans as clean. From Googling, it appears this Kryptik trojan is fairly old, so I'm surprised it would have been able to slip by ESS 6. I know this information is very vague and probably not helpful, but I thought I would throw it out there in case anyone else experiences a similar problem. If so, maybe ESET can determine if there's an actual bug running loose.