This program is packed using a packer program associated with numerous other malware.
Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.
Packed:W32/TDSS.gen!A is a Generic Detection for packed files associated with Backdoor:W32/TDSS.
About Generic Detections
Unlike signature or single-file detections, a Generic Detection does not identify a unique or individual malicious program. Instead, a Generic Detection looks for broadly applicable code or behavior characteristics that indicate a file as potentially malicious, so that a single Generic Detection can efficiently identify dozens, or even hundreds of malware.