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ThreatExpert's Statistics for Net-Worm.Win32.Koobface.csy [Kaspersky Lab]:

Net-Worm.Win32.Koobface.csy [Kaspersky Lab] is also known as:
Threat AliasNumber of Incidents
Troj/Capper-Gen [Sophos]15
Downloader [Symantec]3
Generic.dx!iuf [McAfee]3
Net-Worm.Koobface [PC Tools]3
Win32/Koobface.worm.17408.Q [AhnLab]3

Net-Worm.Win32.Koobface.csy [Kaspersky Lab] is known to be created as:
%ProgramFiles%\captcha.dll
Note: %ProgramFiles% is a variable that refers to the Program Files folder. A typical path is C:\Program Files.