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ThreatExpert's Statistics for W32.Downadup.C [Symantec]:

W32.Downadup.C [Symantec] is also known as:
Threat AliasNumber of Incidents
Worm:Win32/Conficker.D [Microsoft]12
Trojan-Downloader.Win32.Kido.a [Kaspersky Lab]7
Trojan-Downloader.Win32.Kido [Ikarus]6
W32/Conficker.worm.gen.c [McAfee]6
W32/Conficker.worm.gen.d [McAfee]6
W32/Confick-G [Sophos]5
Mal/Conficker-B [Sophos]4
Mal/Generic-A [Sophos]3
Trojan.Conficker.c.gen [PC Tools]3
Win32.Worm.Downadup [Ikarus]3
Worm.Conficker.B [PC Tools]3
Net-Worm.Win32.Kido [Ikarus]2
Trojan-Downloader.Kido!sd6 [PC Tools]2
Worm.Conficker.C [PC Tools]2
Net-Worm.Kido!sd6 [PC Tools]1
Trojan.Downloader [PC Tools]1
Trojan.Win32.Pakes.ngs [Kaspersky Lab]1
Trojan.Win32.Vilsel.ohm [Kaspersky Lab]1
Trojan-Downloader.Win32.Kido.bi [Kaspersky Lab]1
Trojan-Downloader.Win32.Kido.f [Kaspersky Lab]1
Trojan-Downloader.Win32.Kido.l [Kaspersky Lab]1
Win32/Conficker.worm.103424 [AhnLab]1
Win32/Conficker.worm.83456 [AhnLab]1
Win32/Conficker.worm.84992 [AhnLab]1
Win32/Conficker.worm.87040 [AhnLab]1
Win32/Conficker.worm.88064 [AhnLab]1
Win32/Conficker.worm.88576 [AhnLab]1
Win32/Conficker.worm.88576.B [AhnLab]1
Win32/Conficker.worm.Gen [AhnLab]1
Win-Trojan/Kido.87040.B [AhnLab]1

W32.Downadup.C [Symantec] is known to be created as:
%System%\zeweujnd.dll
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).