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Virus:Worm/Taterf.DL.2
Date discovered:18/04/2010
Type:Worm
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Low
Damage Potential:Low to medium
Static file:Yes
File size:122.880 Bytes
MD5 checksum:92a7c84e74fdd1176f3536e0d04971da
IVDF version:7.10.06.116 - Sunday, April 18, 2010

 General Aliases:
   •  Bitdefender: Trojan.PWS.OnLineGames.KDHY
   •  Panda: W32/Lineage.KZD
   •  Eset: Win32/PSW.OnLineGames.OUM


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 location:
   • %TEMPDIR%\xvassdf.exe



It deletes the initially executed copy of itself.



It deletes the following files:
   • %TEMPDIR%\4tddfwq0.dll
   • %TEMPDIR%\ar.exe
   • %TEMPDIR%\ar1.rar



The following files are created:

%TEMPDIR%\4tddfwq1.dll
%TEMPDIR%\ar1.rar
%TEMPDIR%\4tddfwq0.dll Further investigation pointed out that this file is malware, too. Detected as: Worm/Taterf.DL.1

%temporary internet files%\ar[1].rar
%TEMPDIR%\ar.exe
%temporary internet files%\ar1[1].rar



It tries to download some files:

– The location is the following:
   • http://www.googlecvn.com/1rb/**********


– The location is the following:
   • http://www.baidudfc.com/1rb/**********




It tries to executes the following files:

– Filename:
   • "%PROGRAM FILES%\Internet Explorer\IEXPLORE.EXE"


– Filename:
   • "%TEMPDIR%\ar.exe"

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

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • "54dfsger"="%TEMPDIR%\xvassdf.exe"



The following registry key is added:

– [HKLM\SOFTWARE\Classes\CLSID\MADOWN]
   • "urlinfo"="nedsc.i"

 Injection –  It injects the following file into a process: %TEMPDIR%\4tddfwq0.dll

    Process name:
   • explorer.exe



– It injects itself as a remote thread into a process.

    Process name:
   • iexplore.exe



–  It injects the following file into a process: %TEMPDIR%\4tddfwq1.dll

    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 mercoledì 21 luglio 2010
Descrizione aggiornata da Petre Galan su mercoledì 21 luglio 2010

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