From Norton's site:
w32.idjit.NULL virus is a backdoor Trojan Horse that gives a remote attacker complete control over a compromised system. The existence of the file uprootkit.exe is an indication of a possible infection.
Also Known As: Backdoor.UpRootKit [Kaspersky]
Type: Trojan Horse
Infection Length: 49,152 bytes
Systems Affected: Windows 2000, Windows NT, Windows Server 2003, Windows XP
Systems Not Affected: Linux, Macintosh, OS/2, UNIX, Windows 95, Windows 98, Windows Me