Virus:TR/Dldr.Agent.eckq
Date discovered:28/07/2010
Type:Trojan
Subtype:Downloader
In the wild:Yes
Reported Infections:Medium
Distribution Potential:Medium
Damage Potential:Medium
Static file:Yes
File size:118.784 Bytes
MD5 checksum:a8dbf047f8b6d0eb40c01307ab798c28
IVDF version:7.10.09.249 - Wednesday, July 28, 2010

 General Method of propagation:
   • No own spreading routine


Aliases:
   •  Kaspersky: Trojan-Downloader.Win32.Agent.eckq
   •  Eset: a variant of Win32/Injector.CLP
   •  AhnLab: Downloader/Win32.Agent


Platforms / OS:
   • Windows NT
   • Windows ME
   • Windows 2000
   • Windows XP
   • Windows 2003
   • Windows Vista
   • Windows Server 2008
   • Windows 7


Side effects:
   • Disable security applications
   • Downloads a file
   • Lowers security settings
   • Registry modification
   • Steals information

 Files It copies itself to the following location:
   • %HOME%\user1\winlogon.exe




It tries to download a file:

– The location is the following:
   • http://0-1-0-**********-0-0.info/VERSION.TXT
It is saved on the local hard drive under: %HOME%\user1\VERSION.TXT

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

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   • "NVIDIA Media Center Library"="%HOME%\user1\winlogon.exe"



The following registry keys are added:

– [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\avnt.exe]
   • "Debugger"="\"%WINDIR%\twunk_16.exe\""

– [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\avsched32.exe]
   • "Debugger"="\"%WINDIR%\twunk_16.exe\""

– [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\avrescue.exe]
   • "Debugger"="\"%WINDIR%\twunk_16.exe\""

– [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\avpmon.exe]
   • "Debugger"="\"%WINDIR%\twunk_16.exe\""

– [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\penis32.exe]
   • "Debugger"="\"%WINDIR%\twunk_16.exe\""

– [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\periscope.exe]
   • "Debugger"="\"%WINDIR%\twunk_16.exe\""

– [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\persfw.exe]
   • "Debugger"="\"%WINDIR%\twunk_16.exe\""

– [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\perswf.exe]
   • "Debugger"="\"%WINDIR%\twunk_16.exe\""

– [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\pf2.exe]
   • "Debugger"="\"%WINDIR%\twunk_16.exe\""



The following registry keys are changed:

Internet Explorer's start page:

– [HKEY_USERS\S-1-5-21-602162358-2077806209-839522115-1003\Software\
   Microsoft\Internet Explorer\Main]
   Old value:
   • "Local Page"="c:\windows\\system32\\blank.htm"
   • "Start Page"="about:blank"
   • "Search Page"="http://www.microsoft.com/isapi/redir.dll?prd=ie&ar=iesearch"
   New value:
   • "Local Page"="http://www.nuevaq.fm"
   • "Start Page"="http://www.nuevaq.fm"
   • "Search Page"="http://www.nuevaq.fm"
   • "Default_Search_URL"="http://www.nuevaq.fm"
   • "Default_Page_URL"="http://www.nuevaq.fm"

– [HKLM\SOFTWARE\Microsoft\Internet Explorer\Main]
   Old value:
   • "Default_Page_URL"="http://www.microsoft.com/isapi/redir.dll?prd=ie&pver=6&ar=msnhome"
   • "Default_Search_URL"="http://www.microsoft.com/isapi/redir.dll?prd=ie&ar=iesearch"
   • "Search Page"="http://www.microsoft.com/isapi/redir.dll?prd=ie&ar=iesearch"
   • "Local Page"=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,\
   • 00,74,00,25,00,5c,00,73,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,\
   • 62,00,6c,00,61,00,6e,00,6b,00,2e,00,68,00,74,00,6d,00,00,00
   • "Start Page"="http://www.microsoft.com/isapi/redir.dll?prd={SUB_PRD}&clcid={SUB_CLSID}&pver={SUB_PVER}&ar=home"
   New value:
   • "Default_Page_URL"="http://www.nuevaq.fm"
   • "Default_Search_URL"="http://www.nuevaq.fm"
   • "Search Page"="http://www.nuevaq.fm"
   • "Local Page"="http://www.nuevaq.fm"
   • "Start Page"="http://www.nuevaq.fm"

 Injection – It injects itself into a process.

    Process name:
   • svchost.exe


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

Description inserted by Patrick Schoenherr on Thursday, July 29, 2010
Description updated by Patrick Schoenherr on Thursday, July 29, 2010

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