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Virus:Worm/Palevo.107520
Date discovered:29/03/2010
Type:Worm
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Medium
Damage Potential:Low to medium
Static file:Yes
File size:107.520 Bytes
MD5 checksum:677b9c315d6e15f4692d947586fd63d3
IVDF version:7.10.05.244 - Monday, March 29, 2010

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


Aliases:
   •  Mcafee: W32/Palevo.gen.a
   •  Sophos: Mal/Palevo-A
   •  Bitdefender: Trojan.Generic.4345815
   •  Panda: W32/P2PWorm.JM
   •  Eset: Win32/Peerfrag.GL


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


Side effects:
   • Downloads a malicious file
   • Drops malicious files
   • Registry modification

 Files It copies itself to the following locations:
   • %drive%\ZOKAPEDER\gejlord.exe
   • %HOME%\csrss.exe



The following files are created:

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

– %HOME%\Application Data\juzjf.exe Further investigation pointed out that this file is malware, too. Detected as: TR/Kryptik.FY

%temporary internet files%\2525-c[1].exe Further investigation pointed out that this file is malware, too. Detected as: TR/Kryptik.FY

%TEMPDIR%\098.exe Further investigation pointed out that this file is malware, too. Detected as: TR/Kryptik.FY




It tries to download a file:

– The location is the following:
   • http://rapidshare.com/files/426123444/**********




It tries to execute the following file:

– Filename:
   • C:\Temp\098.exe

 Registry The following registry keys are added in order to run the processes after reboot:

– [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon]
   • "Taskman"="%HOME%\csrss.exe"

– [HKCU\Software\Microsoft\Windows NT\CurrentVersion\Winlogon]
   • "Shell"="%HOME%\csrss.exe,explorer.exe,%HOME%\Application Data\juzjf.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:

– Windows Live 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:

– property.ban**********.ru on UDP port 43000
– sandra.pri**********.com on UDP port 43000
– gut**********.com on UDP port 2525

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

    Process name:
   • explorer.exe


 Miscellaneous It creates the following Mutexes:
   • k800+41
   • aljsughu55

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

Description insérée par Petre Galan le vendredi 22 octobre 2010
Description mise à jour par Petre Galan le vendredi 22 octobre 2010

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