Worm.Win32.Doomjuice.a

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This worm spreads via the Internet, using computers infected by I-Worm.Mydoom.a and I-Worm.Mydoom.b to propagate. It is approximately 35KB in size, compressed using UPX. The size of the decompressed file is approximately 43 KB. Installation On launching, the worm copies itself to the Windows system directory under the name intrenat.exe and registers this file in the system registry auto-run key:

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
 "Gremlin" = "%system%\intrenat.exe"

The worm extracts a file named sync-src-1.00.tbz from itself, and copies this file to the root directory, the Windows directory, the Windows system directory and to user directories in Documents and Settings.

This file is a tar archive which contains the full source text of I-Worm.Mydoom.a

The worm creates the unique identifier sync-Z-mtx_133 to show its presence in memory. Propagation To propagate, the worm utilizes computers infected by Mydoom.a and Mydoom.b The worm connects to TCP port 3127, which has been opened by shimgapi.dll, the backdoor component of Mydoom, to receive commands. If the infected computer answers the command, then Doomjuice establishes a connection and sends a copy of itself. The backdoor component of Mydoom accepts the file and executes it.

In order to choose IP addresses to attack, the worm uses the following formula: (A.B.C.D)

The first value in the address (A) is selected from the following list:

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