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Virus:Worm/Rimecud.B.243
Date discovered:18/03/2010
Type:Worm
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Medium
Damage Potential:Low to medium
Static file:Yes
File size:124.928 Bytes
MD5 checksum:ead344acd5f482299f0cf4c4d74129f4
IVDF version:7.10.05.136 - Thursday, March 18, 2010

 General Methods of propagation:
    Autorun feature
    Messenger
   • Peer to Peer


Aliases:
   •  Sophos: W32/Autorun-BBI
   •  Panda: W32/P2Pworm.HM
   •  Eset: Win32/Peerfrag.EC
   •  Bitdefender: Worm.P2P.Palevo.CX


Platforms / OS:
   • Windows 2000
   • Windows XP
   • Windows 2003


Side effects:
   • Drops malicious files
   • Registry modification

 Files It copies itself to the following locations:
   • %recycle bin%\%CLSID%\MsMxEng.exe
   • %drive%\ravira\ravira32.exe



The following files are created:

%recycle bin%\%CLSID%\Desktop.ini
%drive%\autorun.inf This is a non malicious text file with the following content:
   • %code that runs malware%

 Registry The following registry key is added in order to run the process after reboot:

[HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon]
   • "Taskman"="%recycle bin%\%CLSID%\MsMxEng.exe"

 P2P In order to infect other systems in the Peer to Peer network community the following action is performed:   It retrieves shared folders by querying the following registry keys:
   • Software\BearShare\General
   • Software\iMesh\General
   • Software\Shareaza\Shareaza\Downloads
   • Software\Kazaa\LocalContent
   • Software\DC++
   • Software\eMule
   • Software\Microsoft\Windows\CurrentVersion\Uninstall\eMule Plus_is1

   It searches for directories that contain the following substring:
   • \Local Settings\Application Data\Ares\My Shared Folder


 Messenger It is spreading via Messenger. The characteristics are described below:

 MSN Messenger

The URL then refers to a copy of the described malware. If the user downloads and executes this file the infection process will start again.

 Backdoor The following ports are opened:

ant**********.com on UDP port 44490
fre**********.com on UDP port 44490
dig**********.cn on UDP port 44490

 Injection It injects itself as a remote thread into a process.

    Process name:
   • explorer.exe


 File details Runtime packer:
In order to aggravate detection and reduce size of the file it is packed with a runtime packer.

Description inserted by Petre Galan on Thursday, June 24, 2010
Description updated by Andrei Ivanes on Friday, June 25, 2010

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