Symantec Security Response professionals have just analyzed the first known 64-bit machines for malware threats - W64.Rugrat.3344. The risk-free virus is not spread widely ; But,
Microsoft Office Enterprise 2007, it can be the very first known productive attack a 64-bit Windows executables risk. This menace does not affect the 32-bit executable, not in 32-bit Windows platforms. It 's just for 64-bit Windows operating systems. 
W64.Rugrat.3344 with all the following characteristics : 
- The risk of a immediate impact on plan execution (direct-action infector), which , as soon as applied, immediately from memory. 
- the IA64 ( Intel Architecture) assembly code written in IA64 executable files can be contaminated , but doesn't contain . dll files. 
- could be infected using the virus in the same folder of files and subfolders in all documents. 
Symantec Protection Response senior director Vincent Weafer stated: Impact . At existing, we do not feel the threat of large-scale imitation , mainly because only with innovative technical expertise to complete the preparation of assembly code . 
W64.Rugrat.3344 can be a danger level . ( 5 being one of the most serious risk .) Symantec Protection Response encourages consumers to update virus definitions from the danger of destruction.