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ThreatExpert's Statistics for Mal/EncPk-CL [Sophos]:

Mal/EncPk-CL [Sophos] is also known as:
Threat AliasNumber of Incidents
VirTool:Win32/Obfuscator.Q [Microsoft]7
Trojan Horse [Symantec]6
Infostealer.Bzup [Symantec]5
Generic.dx [McAfee]4
New Malware.bx [McAfee]3
TROJ_BZUP.AG [Trend Micro]2
Trojan:Win32/Boaxxe.B [Microsoft]2
Trojan-Spy.Win32.BZub.btd [Kaspersky Lab]2
Backdoor.Win32.Small.dco [Kaspersky Lab]1
Backdoor.Win32.Small.dul [Kaspersky Lab]1
Generic BackDoor [McAfee]1
Generic BackDoor.u [McAfee]1
Generic PWS.y [McAfee]1
New Malware.bl [McAfee]1
New Malware.cn [McAfee]1
Rootkit.Win32.Podnuha.ai [Kaspersky Lab]1
TROJ_OBFUSCA.GQ [Trend Micro]1
TROJ_SMALL.GNY [Trend Micro]1
Trojan.Win32.Agent.dhc [Kaspersky Lab]1
Trojan.Win32.BHO.gy [Kaspersky Lab]1
Trojan.Win32.StartPage.bag [Ikarus]1
Trojan-Downloader.Win32.Murlo.lt [Kaspersky Lab]1
TrojanDownloader:Win32/Cavitate.gen!C [Microsoft]1
TrojanSpy.Bzub.BYQ!Pac [PC Tools]1
TSPY_BZUP.AC [Trend Micro]1
VirTool.Obfuscator.NO [PC Tools]1
VirTool:WinNT/Boaxxe.D [Microsoft]1

Mal/EncPk-CL [Sophos] is known to be created as:
%CommonPrograms%\startup\msupd64335.exe
%System%\ccfgn.dll
%System%\comui.dll
Notes:
  • %CommonPrograms% is a variable that refers to the file system directory that contains the directories for the common program groups that appear on the Start menu for all users. A typical path is C:\Documents and Settings\All Users\Start Menu\Programs (Windows NT/2000/XP).
  • %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).