Full description

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.

说明添加者： Petre Galan 打开 2010年9月6日星期一
说明更新者： Petre Galan 打开 2010年9月8日星期三

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