For Home

Virus Profile: Koutodoor.gen.g!4CA810C29C50

Threat Search
Print
   
Virus Profile information details
Risk Assessment: Home Low | Corporate Low
Date Discovered: 5/9/2012
Date Added: 5/9/2012
Origin: Unknown
Length: 188672
Type: Trojan
Subtype: Generic
DAT Required: 6706
Removal Instructions
   
 
 
   

Description

This is a Trojan detection. Unlike viruses, Trojans do not self-replicate. They are spread manually, often under the premise that they are beneficial or wanted. The most common installation methods involve system or security exploitation, and unsuspecting users manually executing unknown programs. Distribution channels include e-mail, malicious or hacked Web pages, Internet Relay Chat (IRC), peer-to-peer networks, etc.

Indication of Infection

This symptoms of this detection are the files, registry, and network communication referenced in the characteristics section.

Methods of Infection

Trojans do not self-replicate. They are spread manually, often under the premise that the executable is something beneficial. Distribution channels include IRC, peer-to-peer networks, newsgroup postings, e-mail, etc.

   

Virus Characteristics

This is a Trojan

File PropertiesProperty Values
McAfee DetectionKoutodoor.gen.g
Length188672 bytes
MD54ca810c29c508a094793a7ff83bedbb3
SHA1ae49f452da6fb1d570cab5e39c2494b1b034f596


Other Common Detection Aliases

Company NamesDetection Names
ahnlabTrojan/Win32.Koutodoor
avastWin32:Koutodoor-F
AVG (GriSoft)Luhe.Fiha.A
aviraTR/Dropper.Gen
F-ProtW32/Koutodoor.A.gen!Eldorado
MicrosoftTrojan:Win32/Koutodoor.E
SymantecTrojan Horse
normanKoutodoor.CVH
pandaBck/Koutodoor.E
SophosMal/Koutodoor-A
Trend MicroBKDR_KTDOOR.SMIC

Other brands and names may be claimed as the property of others.


ActivitiesRisk Levels
Attempts to write to a memory location of a protected process.High
Attempts to write to a memory location of a Windows system processHigh
Attempts to launch an instance of the Windows file system explorer.Low
Attempts to launch an instance of Internet Explorer.Low
Enumerates many system files and directories.Low
No digital signature is presentInformational


McAfee ScansScan Detections
McAfee BetaKoutodoor.gen.g
McAfee SupportedKoutodoor.gen.g



System Changes

Some path values have been replaced with environment variables as the exact location may vary with different configurations.
e.g.
%WINDIR% = \WINDOWS (Windows 9x/ME/XP/Vista/7), \WINNT (Windows NT/2000)
%PROGRAMFILES% = \Program Files


The following files were analyzed:

ae49f452da6fb1d570cab5e39c2494b1b034f596

The following files have been added to the system:

  • %WINDIR%\SYSTEM32\drivers\xrue.sys
  • %WINDIR%\SYSTEM32\dxv.dll
The following files were temporarily written to disk then later removed:

  • %WINDIR%\SYSTEM32\regqdf.bat
The following registry elements have been changed:

  • HKEY_CURRENT_USER\SOFTWARE\MICROSOFT\INTERNET EXPLORER\EXTENSIONS\CMDMAPPING\{92780B25-18CC-41C8-B9BE-3C9C571A8263} = 8193
  • HKEY_CURRENT_USER\SOFTWARE\MICROSOFT\INTERNET EXPLORER\EXTENSIONS\CMDMAPPING\NEXTID = 8194
  • HKEY_CURRENT_USER\SOFTWARE\MICROSOFT\INTERNET EXPLORER\MAIN\FULLSCREEN = no
  • HKEY_CURRENT_USER\SOFTWARE\MICROSOFT\INTERNET EXPLORER\MAIN\WINDOW_PLACEMENT = [binary data]
  • HKEY_CURRENT_USER\SOFTWARE\MICROSOFT\INTERNET EXPLORER\TOOLBAR\LOCKED = 1
  • HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\WINDOWS\CURRENTVERSION\DATETIME\SID = S-1-5-21-1482476501-[private subnet]522115-500
  • HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\WINDOWS\CURRENTVERSION\EXPLORER\HIDEDESKTOPICONS\NEWSTARTPANEL\{871C5380-42A0-1069-A2EA-08002B30309D} = 0
The applications attempted the following network connection(s):

  • 123.125.115.***:80
  • hxxp://www.go2000.cn/*****
   

All Users:

Please use the following instructions for all supported versions of Windows to remove threats and other potential risks:

1.Disable System Restore .

2.Update to current engine and DAT files for detection and removal.

3.Run a complete system scan.

Modifications made to the system Registry and/or INI files for the purposes of hooking system startup, will be successfully removed if cleaning with the recommended engine and DAT combination (or higher).

1. Please go to the Microsoft Recovery Console and restore a clean MBR.

On windows XP:

Insert the Windows XP CD into the CD-ROM drive and restart the computer.
When the "Welcome to Setup" screen appears, press R to start the Recovery Console.
Select the Windows installation that is compromised and provide the administrator password
Issue 'fixmbr' command to restore the Master Boot Record
Follow onscreen instructions
Reset and remove the CD from CD-ROM drive.


On Windows Vista and 7:

Insert the Windows CD into the CD-ROM drive and restart the computer.
Click on "Repair Your Computer"
When the System Recovery Options dialog comes up, choose the Command Prompt.
Issue 'bootrec /fixmbr' command to restore the Master Boot Record
Follow onscreen instructions
Reset and remove the CD from CD-ROM drive.