Threat Description

Antinny

Details

Aliases: Antinny, W32.HLLW.Antinny
Category: Malware
Type: Worm
Platform: W32

Summary



This worm will spread though the P2P network of the Japanese software Winny P2P. The file length is 651264.



Removal



Automatic Disinfection

Allow F-Secure Anti-Virus to disinfect the relevant files.

For more general information on disinfection, please see Removal Instructions.



Technical Details



When the worm is executed it will display a fake error Window with Japanese text.

The worm incorporates DLLs within its body, with the purpose of handling LHA and ZIP compressed files. Those DLLs amount for most of the worm's length.

The DLLs will be copied to the Windows' system folder. Their names and lengths follow:

UNLHA32.DLL, 254.464 bytes
 zip32.dll,   135.168 bytes
 ZIP32J.DLL,   61.440 bytes


all of those components are harmless by themselves.

The worm copies itself to the Windows' system folder, the full path of the file is:

%WinSysDir%\ny.exe


and an entry in the Windows' Registry is added, aiming at having the worm start when Windows does.

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\run]
 "ara-key" = %WinSysDir%\ny.exe -StartUp


It will then copy itself again, with the same name "ny.exe", to the user's default folder for temporary files.

The worm will attempt to find the Winny P2P software by searching the system for the application's main executable "Winny.exe", once found it will copy itself to the folder designated by the user as the one containing shared content. This will make the worm available for download to other users of the P2P network.



Detection


Detection in F-Secure Anti-Virus was published on August 18th, 2003 in update:
Detection Type: PC
Database: 2003-08-18_02



Technical Details: Ero Carrera, 26th of September, 2003


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