w32.jeefo

[OssMan]

W32.Jeefo is a Windows Portable Executable (PE) file infector. Files infected by W32.Jeefo increase in size by 36,352 bytes.

Anyone know what this virus does? A friend of mine has it..it just says that files infected by it increase in size, but that doesn't really make sense to me. I looked on the Symantec website and that's pretty much what it says, but it seems like it does something else too.
http://securityresponse.symantec.com/avcenter/venc/data/w32.jeefo.html

[DS]

Damage

Payload:
Modifies files: Modifies system registry.
Compromises security settings: Allows unauthorized access to the compromised machine.

Meaning it takes system files and adds itself to them. It then allows people who created the virus or know how to work with it, to get into your computer.