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Virus:Worm/Palevo.aiix
Date discovered:19/05/2010
Type:Worm
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Medium
Damage Potential:Low to medium
Static file:Yes
File size:157.696 Bytes
MD5 checksum:7d590f7c081eb0606dc1de16715feedd
IVDF version:7.10.07.134 - Wednesday, May 19, 2010

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


Aliases:
   •  Bitdefender: Win32.Worm.Palevo.AV
   •  Panda: W32/P2Pworm.NJ
   •  Eset: Win32/Peerfrag.HF


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:
   • %drive%\Docs\print.exe
   • %HOME%\ctfmon.exe



It deletes the initially executed copy of itself.



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%

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

– %HOME%\Start Menu\Programs\Startup\mm5jezqql.exe Further investigation pointed out that this file is malware, too. Detected as: TR/Lethic.B.111

– %TEMPDIR%\935.exe Further investigation pointed out that this file is malware, too. Detected as: TR/Dldr.Refroso.ayg

– %temporary internet files%\23[1].exe Further investigation pointed out that this file is malware, too. Detected as: Worm/Palevo.avag

– %recycle bin%\%CLSID%\yv8g67.exe
– %HOME%\Application Data\ozzfhv.exe
– %TEMPDIR%\533.exe
– %temporary internet files%\fvewmo[1].exe
– %TEMPDIR%\1182124.exe Further investigation pointed out that this file is malware, too. Detected as: Worm/Palevo.auvi

– %TEMPDIR%\541.exe Further investigation pointed out that this file is malware, too. Detected as: TR/Lethic.B.111

– %HOME%\Start Menu\Programs\Startup\a6ww6ii6.exe Further investigation pointed out that this file is malware, too. Detected as: TR/Lethic.B.105

– %TEMPDIR%\747.exe
– %TEMPDIR%\795.exe Further investigation pointed out that this file is malware, too. Detected as: Worm/Palevo.avag

– %HOME%\Start Menu\Programs\Startup\vglwriiduup.exe Further investigation pointed out that this file is malware, too. Detected as: TR/Dldr.Refroso.ayg

– %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 Further investigation pointed out that this file is malware, too. Detected as: Worm/Palevo.avag

– %temporary internet files%\fewmkm[1].exe Further investigation pointed out that this file is malware, too. Detected as: TR/Lethic.B.105

– %temporary internet files%\vfgweregw[1].exe Further investigation pointed out that this file is malware, too. Detected as: TR/Dldr.Refroso.ayg




It tries to download some files:

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


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


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




It tries to executes the following files:

– Filename:
   • %TEMPDIR%\795.exe


– Filename:
   • %TEMPDIR%\533.exe


– Filename:
   • %TEMPDIR%\1182124.exe


– Filename:
   • %TEMPDIR%\747.exe


– Filename:
   • %TEMPDIR%\935.exe


– Filename:
   • %TEMPDIR%\541.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:

– tinaivanovic.sex**********.info on UDP port 51000
– 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
– f5v**********.com 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 Thursday, September 9, 2010
Description updated by Petre Galan on Thursday, September 9, 2010

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