W32.Perrun is a virus that appends itself to .jpeg or .txt files. The malicious content of files that it alters will not spread to other computers. Indications of infection are that .jpg or .txt files will have increased in size by approximately 11KB, and the presence of the file Extrk.exe or Textrk.exe.

The original data will not successfully extract from .jpeg files if the file C:\Windows\System\Shimgvw.dll does not exist on an infected computer.
The original data will not successfully extract from .txt files if the file C:\Windows\Notepad.exe does not exist on an infected computer.

Also Known As:  W32/Perrun-A, PE_PERRUN.A, Win32.Perrun, W32/Perrun, Perrun, W32/Perrun.A
Variants:       W32.Perrun.dr
Type:   Virus
Infection Length:       11,780 bytes

Systems Affected:       Windows 3.x, Windows 95, Windows 98, Windows NT, Windows 2000, Windows XP, Windows Me
Systems Not Affected:   Macintosh, UNIX, Linux

removal instructions

   1. Update the virus definitions and run a full system scan.
   2. Repair files that are detected as W32.Perrun, and delete files that are detected as W32.Perrun.dr
   3. Restore the (Default) value of the registry key

      HKEY_LOCAL_MACHINE\Software\Classes\jpegfile\shell\open\command

      or

      HKEY_LOCAL_MACHINE\Software\Classes\txtfile\shell\open\command

selengkapnya ada disini:

http://www.symantec.com/avcenter/venc/data/w32.perrun.html


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