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Date discovered:23/04/2010
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Medium
Damage Potential:Low to medium
Static file:Yes
File size:154.112 Bytes
MD5 checksum:a8ae3d72a9316ceb00260bfcf5610674
IVDF version:

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

   •  Bitdefender: Win32.Worm.Palevo.AV
   •  Panda: W32/P2Pworm.JW
   •  Eset: Win32/Peerfrag.GL

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

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

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

It deletes the initially executed copy of itself.

The following files are created:

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

%temporary internet files%\kristijan[1].exe Further investigation pointed out that this file is malware, too. Detected as: Worm/Palevo.104960

%TEMPDIR%\168.exe Further investigation pointed out that this file is malware, too. Detected as: Worm/Palevo.104960

– %HOME%\Application Data\lbisov.exe
%temporary internet files%\10[1].exe

It tries to download some files:

– The location is the following:

– The location is the following:

It tries to executes the following files:

– Filename:
   • %TEMPDIR%\833.exe

– Filename:
   • %TEMPDIR%\168.exe

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

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

–  [HKCU\Software\Microsoft\Windows NT\CurrentVersion\Winlogon]
   • Shell

 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:

– 91.211.11**********.127 on UDP port 8111
– jebena.ana**********.su on UDP port 50000
– 92.241.19**********.172 on UDP port 15000

 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.

Descrizione inserita da Petre Galan su lunedì 6 settembre 2010
Descrizione aggiornata da Petre Galan su lunedì 6 settembre 2010

Indietro . . . .