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Win32.Netsky.P

by Marianna Schmudlach / March 24, 2004 2:39 PM PST

Detection Published: March 21, 2004
Description Modified: March 25, 2004

Category: Win32
Also known as: ZIP.Netsky.P, Win32/Netsky.P.Worm, W32/Netsky.P@mm (F-Secure), W32/Netsky.p@MM (McAfee), I-Worm.Netsky.q (Kaspersky)

Netsky.P is a worm that spreads through e-mail and file sharing. It is distributed as a 29,568 byte Win32 executable, compressed with FSG, which drops a 26,624 byte DLL file. It also distributes itself inside ZIP archives.

Netsky.P arrives in the form of a 29,568 byte "dropper", which creates and loads a DLL file containing the bulk of the worm code.

When run, the dropper creates a mutex called "'D'r'o'p'p'e'd'S'k'y'N'e't'", to avoid running multiple copies of itself.

It copies itself to

%Windows%\FVProtect.exe

It also decrypts the DLL stored inside its own file, and writes the result to:

%Windows%\userconfig9x.dll

It then calls the first (and only) function in the DLL. The DLL then takes over.

The worm creates a registry value in order to run the dropper each time Windows starts:

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Norton Antivirus AV = "%Windows%\FVProtect.exe"

More:http://www3.ca.com/threatinfo/virusinfo/virus.aspx?id=38650

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