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ThreatExpert's Statistics for NTRootKit-AC [McAfee]:

NTRootKit-AC [McAfee] is also known as:
Threat AliasNumber of Incidents
Mal/FakeAle-C [Sophos]177
Backdoor.Win32.UltimateDefender.a [Kaspersky Lab]176
Hacktool.Rootkit [Symantec]176
VirTool:WinNT/Xantvi.gen!A [Microsoft]176
Rootkit.Renos.Gen.11 [PC Tools]167
Backdoor.Win32.UltimateDefender [Ikarus]68
not-a-virus:FraudTool.Win32.UltimateDefender.cm [Ikarus]42
not-a-virus:.FraudTool.Win32.UltimateDefender.cm [Ikarus]37
not-a-virus:.FraudTool [Ikarus]5
Adware.Agent.ZO [PC Tools]4
Backdoor.UltimateDefender [PC Tools]3
Hacktool.Rootkit!sd6 [PC Tools]2
Win-Trojan/Ultimatedefender.28672.B [AhnLab]2
Win-Trojan/Ultimatedefender.27648.AB [AhnLab]1
Win-Trojan/Ultimatedefender.27648.AM [AhnLab]1
Win-Trojan/Ultimatedefender.27648.BP [AhnLab]1

NTRootKit-AC [McAfee] is known to be created as:
%System%\dllcache\beep.sys
%System%\dllcache\figaro.sys
Note: %System% is a variable that refers to the System folder. By default, this is C:\Windows\System (Windows 95/98/Me), C:\Winnt\System32 (Windows NT/2000), or C:\Windows\System32 (Windows XP).