Virus:Worm/Taterf.B.84
Date discovered:14/03/2010
Type:Worm
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Low to medium
Damage Potential:Low to medium
Static file:Yes
File size:94.720 Bytes
MD5 checksum:c2312593403d6966c416929434ea2d09
VDF version:7.10.02.30
IVDF version:7.10.05.67 - Sunday, March 14, 2010

 General Method of propagation:
   • Autorun feature


Aliases:
   •  Mcafee: PWS
   •  Sophos: Mal/Generic-A
   •  Bitdefender: Trojan.Generic.3287495
   •  Panda: W32/Lineage.LIW
   •  Eset: Win32/PSW.OnLineGames.NWF


Platforms / OS:
   • Windows 2000
   • Windows XP
   • Windows 2003


Side effects:
   • Lowers security settings
   • Downloads malicious files
   • Drops malicious files
   • Registry modification

 Files It copies itself to the following locations:
   • %drive%\q1.exe
   • %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:

– %drive%\autorun.inf This is a non malicious text file with the following content:
   • %code that runs malware%

– %TEMPDIR%\ar.exe
– %TEMPDIR%\4tddfwq0.dll Further investigation pointed out that this file is malware, too. Detected as: TR/Crypt.ASPM.Gen

– %temporary internet files%\ar[1].rar
– %TEMPDIR%\4tddfwq1.dll
– %TEMPDIR%\ar1.rar



It tries to download some files:

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


– The location is the following:
   • http://www.yahoosd3.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.h"



The following registry keys are changed:

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced]
   New value:
   • "Hidden"=dword:0x00000002
   • "ShowSuperHidden"=dword:0x00000000

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer]
   New value:
   • "NoDriveTypeAutoRun"=dword:0x00000091

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\
   Folder\Hidden\SHOWALL]
   New value:
   • "CheckedValue"=dword:0x00000000

 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.

Description inserted by Petre Galan on Tuesday, July 20, 2010
Description updated by Andrei Ivanes on Thursday, July 29, 2010

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