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What is it?
win32s.exe is a file associated with the w32.mydoom.v@mm worm.

What does it do?
W32.Mydoom.V@mm is a mass-mailing worm that downloads an excutable file.

When W32.Mydoom.V@mm is executed, it does the following:
  • Adds the value:

    "Win32System" = "%WinSysDir%win32s.exe"

    to the following registry key:


    so that it is executed every time Windows starts.
  • Creates a mutex named "LLLf54fxrDLLL" so that only one copy of the worm is run on the infected computer.
  • Retrieves the email addresses from the Windows address book files.
  • Retrieves the email addresses from the files that have the following extensions on drives C through Y:.........
  • ........
More info and removal instructions

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win32s.exe is Spyware!

Startup DB Entries:
Nothing Found

Service DB Entries:
Nothing Found


Every attempt has been made to ensure the information about win32s.exe is accurate but alot of malware applications try to pose as valid applications. If it is something other than what was posted above please leave some feedback in the forum.
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