I encountered this issue last night while scanning my g/f's C: drive that I had hooked up as an eSATA slave to my PC (she was having problems with the drive). The OS is Windows 7 Professional 64bit. One thing I noticed about the false positive is that it would only alert about the BACKDOOR.BOT trojan when the icardagt.exe file was outside of the C:\windows\system32 directory; it would scan clean from within c:\windows\system32. I verified this on 4 different computers of mine. I'm assuming the error must have been related to the software thinking it was a trojan due to it being in the incorrect location. Interestingly for me, when I was scanning my g/f's C: drive, it was connected via eSATA to my PC and showed as the H:\ drive, so MBAM alerted me to the H:\windows\system32 copy as well - presumably since it, too, is outside of C:\windows\system32. This problem did not exist with the scanning DB version from 2/20 that I tested by restoring an image from then to my PC. It only happened with version 5900 that I pulled last night. Today's 5904 seems to have corrected the false positive.