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Virus:Worm/Palevo.amyo
Date discovered:21/06/2010
Type:Worm
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Medium
Damage Potential:Low to medium
Static file:Yes
File size:94.720 Bytes
MD5 checksum:c6916d93b1edce6c3f944f45bfdfcfad
IVDF version:7.10.08.132 - Monday, June 21, 2010

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


Aliases:
   •  Sophos: Troj/DelpInj-B
   •  Bitdefender: Trojan.Generic.4215795
   •  Panda: Trj/Spammer.AQC
   •  Eset: Win32/Peerfrag.FD


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:
   • %recycle bin%\%CLSID%\syscr.exe
   • %drive%\RECYCLERW\autorun.exe



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%

%TEMPDIR%\772.exe
%SYSDIR%\msvmiode.exe Further investigation pointed out that this file is malware, too. Detected as: TR/Dropper.Gen

%TEMPDIR%\37338.exe Further investigation pointed out that this file is malware, too. Detected as: TR/Dropper.Gen

– %HOME%\Application Data\ltzqai.exe
%WINDIR%\cfdrive32.exe
%TEMPDIR%\114.exe
%temporary internet files%\c57[1].exe
%temporary internet files%\gbf[1].exe
%temporary internet files%\lik[1].exe Further investigation pointed out that this file is malware, too. Detected as: TR/Dropper.Gen




It tries to download some files:

– The location is the following:
   • http://208.53.183.4/**********


– The locations are the following:
   • http://www.nippon.to/cgi-bin/**********
   • http://www.cooleasy.com/cgi-bin/**********
   • http://obsoletegod.com/cgi-bin/**********
   • http://www.cship.info/cgi-bin/**********


– The location is the following:
   • http://www.mcreate.net/cgi-bin/envchk/**********


– The location is the following:
   • http://208.53.183.124/**********


– The location is the following:
   • http://www16.tok2.com/home/aquemai/cgi-bin/**********


– The location is the following:
   • http://208.53.183.92/**********


– The location is the following:
   • http://mobi-sys.ru/img/**********


– The location is the following:
   • http://116.0.22.245/**********


– The location is the following:
   • http://kuwago.hp.infoseek.co.jp/cgi-bin/nph/**********




It tries to executes the following files:

– Filename:
   • %TEMPDIR%\772.exe


– Filename:
   • %TEMPDIR%\114.exe


– Filename:
   • %TEMPDIR%\37338.exe


– Filename:
   • "%SYSDIR%\msvmiode.exe"


– Filename:
   • "%WINDIR%\cfdrive32.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\ltzqai.exe"

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

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   • "MSODESNV7"="%SYSDIR%\msvmiode.exe"
   • "Microsoft Driver Setup"="%WINDIR%\cfdrive32.exe"

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\
   Run]
   • "Microsoft Driver Setup"="%WINDIR%\cfdrive32.exe"



The following registry key is added:

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Setup]
   • "host"="%character string%"
   • "id"="52214552347988288391756387829202"
   • "ridt100413"="1"

 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:

– 89.149.22**********.136 on UDP port 1863
– 174.139.**********.58 on UDP port 9955
– 239.255.25**********.250 on UDP port 1900
– 89.238.22**********.19 on UDP port 137

 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 insérée par Petre Galan le vendredi 10 septembre 2010
Description mise à jour par Petre Galan le vendredi 10 septembre 2010

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