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Virus:Worm/Palevo.zlt
Date discovered:01/04/2010
Type:Worm
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Medium
Damage Potential:Low to medium
Static file:Yes
File size:109.056 Bytes
MD5 checksum:8a2fc1c7c7bda12e344e4f652cc7d091
IVDF version:7.10.06.11 - Thursday, April 1, 2010

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


Aliases:
   •  Mcafee: W32/Palevo.gen.a virus
   •  Sophos: Mal/Palevo-A
   •  Bitdefender: Win32.Worm.Palevo.AV
   •  Panda: W32/P2Pworm.FW
   •  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%\CAROBNJAK\jellena.exe



It deletes the initially executed copy of itself.



The following files are created:

%drive%:\RECYCLER\%CLSID%\Desktop.ini
%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%\890.exe Further investigation pointed out that this file is malware, too. Detected as: Worm/Palevo.104960

%TEMPDIR%\127.exe
%temporary internet files%\24[1].exe
%temporary internet files%\icq600[1].exe Further investigation pointed out that this file is malware, too. Detected as: Worm/Palevo.auvi

– %HOME%\Application Data\lbisov.exe
%drive%:\RECYCLER\%CLSID%\yv8g67.exe Further investigation pointed out that this file is malware, too. Detected as: Worm/Palevo.auvi

%TEMPDIR%\8975119.exe Further investigation pointed out that this file is malware, too. Detected as: Worm/Palevo.auvi

– %HOME%\Application Data\ozzfhv.exe Further investigation pointed out that this file is malware, too. Detected as: Worm/Palevo.104960




It tries to download some files:

– The locations are the following:
   • http://rapidshare.com/files/415338241/**********
   • http://rs816tl3.rapidshare.com/files/415338241/**********


– The location is the following:
   • http://94.228.214.202/**********


– The location is the following:
   • http://193.104.186.88:38716/**********


– The location is the following:
   • http://94.228.214.202/chivas/**********


– The location is the following:
   • http://178.162.182.141:31045/**********


– The location is the following:
   • http://178.162.182.141:31045/**********




It tries to executes the following files:

– Filename:
   • %TEMPDIR%\127.exe


– Filename:
   • %TEMPDIR%\890.exe


– Filename:
   • %TEMPDIR%\8975119.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%\Application Data\ozzfhv.exe"

– [HKCU\Software\Microsoft\Windows NT\CurrentVersion\Winlogon]
   • "Shell"="%recycle bin%\%CLSID%\yv8g67.exe,%HOME%\Application Data\ozzfhv.exe,explorer.exe,%HOME%\Application Data\lbisov.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:

– sandra.pri**********.com on UDP port 44000
– gut**********.com on UDP port 8111
– 77.91.22**********.248 on UDP port 15000
– 91.211.11**********.127 on UDP port 8111
– f5v**********.com on UDP port 443
– 95.211.**********.148 on UDP port 5190

 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 Monday, September 6, 2010
Description updated by Petre Galan on Wednesday, September 8, 2010

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