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ThreatExpert's Statistics for Troj/Capper-Gen [Sophos]:

Troj/Capper-Gen [Sophos] is also known as:
Threat AliasNumber of Incidents
Downloader [Symantec]21
Net-Worm.Win32.Koobface.cci [Kaspersky Lab]16
Win32/Koobface.worm.17408.M [AhnLab]16
Net-Worm.Win32.Koobface.csy [Kaspersky Lab]15
Downloader.Generic [PC Tools]12
Generic.dx!iuf [McAfee]5
Net-Worm.Koobface [PC Tools]5
Win32/Koobface.worm.17408.Q [AhnLab]5
Net-Worm.Win32.Koobface [Ikarus]3
Net-Worm.Win32.Koobface.brr [Kaspersky Lab]2
Trojan.Win32.Koobface [Ikarus]2
Net-Worm.Win32.Koobface.biu [Kaspersky Lab]1
Net-Worm.Win32.Koobface.cvd [Kaspersky Lab]1
Win32.SuspectCrc [Ikarus]1

Troj/Capper-Gen [Sophos] is known to be created as:
%ProgramFiles%\captcha.dll
%ProgramFiles%\captcha5.dll
%ProgramFiles%\captcha7.dll
Note: %ProgramFiles% is a variable that refers to the Program Files folder. A typical path is C:\Program Files.