Win32.Igloo is a backdoor Trojan but it also has worm-like characteristics.  It will offer itself as a download in the KaZaa network shared directories.  It can also distribute itself through IRC channels but is not always successful because there are bugs in the code.  Once inside, it will copy itself to c:\windows\system\RealWayToHack.exe and c:\windows\system\EXPLORER.EXE and will run on each Windows startup.

Recommended Action:
Remove at Once

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AKA:
Backdoor.Win32.Igloo,
Backdoor.Igloo,
VBS/Dismissed.gen,
W32.HLLW.Gool,
VBS/Kazoa-C,
VBS/Karmahotel.gen*,
VBS_GOOL.A,
VBS/Karmahotel.B,
IRC:Generic,
VBS/Pila,
VBS.Igloo.A,
VBS/Kazoa.C,
Win32/Igloo.15.B