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Virus:Worm/VB.nbh
Date discovered:06/07/2010
Type:Worm
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Low
Damage Potential:Low to medium
Static file:Yes
File size:192.512 Bytes
MD5 checksum:73aef5143f392a1a6775b498f133f55f
VDF version:7.10.03.229
IVDF version:7.10.09.16 - Tuesday, July 6, 2010

 General Aliases:
   •  Sophos: W32/SillyFDC-FA
   •  Bitdefender: Trojan.VB.Agent.GY
   •  Panda: W32/Esfury.A
   •  Eset: Win32/AutoRun.VB.RN


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


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

 Files It copies itself to the following location:
   • %HOME%\%current username%1\winlogon.exe




It tries to download some files:

– The location is the following:
   • http://%hex values%-1-1-1-1-1-1-1-.0-0-0-0-0-0-0-0-0-0-0-0-0-%second%-0-0-0-0-0-0-0-0-0-0-0-0-0.info/**********


– The locations are the following:
   • http://3-x-5-3-7-h-p-g-r-y-7-g-b-3-8-9-8-4-l-j.che**********.info/?UqyF177iLqnerD3k1wMD9pphZK5YRcUqENZElLs6pLBTnsiViaQ3l9R34A3NSzr0YPm44JW40azS8NatLXdM3z3lDmp6riA9BZLnAfF7JvRSe3eW2OdgMaG8zWee2tLbhUpLv62we0CUOa7JJDhKzz3spffIYbrgtwsuJtItUIr6Gfkfd2Le=%character string%
   • http://3-x-5-3-7-h-p-g-r-y-7-g-b-3-8-9-8-4-l-j.che**********.info/?PWaevb7Nu6Pppnsx6gbJMPnnDHUPqa5W9MLXtueIMdn1UfoRhsYDY8CbrOJ2YW04vJu4DpIcWdQXStTkQpLfTX8JfIwCy04EIgcRu2UZn1MvgwU3RG5QM5jqXgCDmq84LTikYxahcv97XSH58hkn2TklKhDm7qqWQpLfTX8JfIwCy04EIgcRg9FZGYCYZCcOiNZSAtq1DtN1pCkFSIZOW0sqa0jm=%character string%
   • http://3-x-5-3-7-h-p-g-r-y-7-g-b-3-8-9-8-4-l-j.che**********.info/?XuWr5AhyfCVDk2iGiWCLY1a8okJQOnBfy6DiOwHI9sOxF8JmM73ROUUUmYQJ9sOxF8JmM73ROUUUmYQJBuzolaJfiCzuN6XOn6OPSK96bNl44BULJOq40hKelL2Xk4cQiY0SdxiEk8oh=%character string%
   • http://3-x-5-3-7-h-p-g-r-y-7-g-b-3-8-9-8-4-l-j.che**********.info/?cli_728*90=%character string%




It tries to execute the following files:

– Filename:
   • %HOME%\%current username%1\winlogon.exe


– Filename:
   • %SYSDIR%\svchost.exe

 Registry The following registry keys are added in order to run the processes after reboot:

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • "NVIDIA Media Center Library"="%HOME%\%current username%1\winlogon.exe"

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   • "NVIDIA Media Center Library"="%HOME%\%current username%1\winlogon.exe"



The following registry keys are added:

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\system]
   • "EnableLUA"=dword:0x00000000

– [HKCU\Software\Microsoft\Internet Explorer\Main]
   • "Default_Page_URL"="http://www.nuevaq.fm"
   • "Default_Search_URL"="http://www.nuevaq.fm"



The following registry keys are changed:

– [HKLM\SOFTWARE\Microsoft\Internet Explorer\MAIN]
   New value:
   • "Default_Page_URL"="http://www.nuevaq.fm"
   • "Default_Search_URL"="http://www.nuevaq.fm"
   • "Local Page"="http://www.nuevaq.fm"
   • "Search Page"="http://www.nuevaq.fm"
   • "Start Page"="http://www.nuevaq.fm"

– [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\SystemRestore]
   New value:
   • "DisableSR"=dword:0x00000001

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced]
   New value:
   • "Hidden"=dword:0x00000002
   • "HideFileExt"=dword:0x00000003
   • "ShowSuperHidden"=dword:0x00000000
   • "SuperHidden"=dword:0x00000001

– [HKCU\Software\Microsoft\Internet Explorer\Main]
   New value:
   • "Local Page"="http://www.nuevaq.fm"
   • "Search Page"="http://www.nuevaq.fm"
   • "Start Page"="http://www.nuevaq.fm"

– [HKLM\SYSTEM\CurrentControlSet\Services\Sr]
   New value:
   • "Start"=dword:0x00000004

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

    Process name:
   • svchost.exe


 Miscellaneous Accesses internet resources:
   • http://whos.amung.us/widget/**********/
   • http://widgets.amung.us/classic/02/**********

 File details Programming language:
The malware program was written in Visual Basic.


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 Monday, January 10, 2011
Description updated by Petre Galan on Monday, January 10, 2011

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