Virus Profile: Generic Downloader.gn!B8A5E87E7D42

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Virus Profile information details
Risk Assessment: Home Low | Corporate Low
Date Discovered: 3/20/2011
Date Added: 3/20/2011
Origin: Unknown
Length: 6249696
Type: Trojan
Subtype: -
DAT Required: 6291
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 DetectionGeneric Downloader.gn
Length6249696 bytes
MD5b8a5e87e7d420126751ba9398ce12246
SHA137688ad85097a7cedb47c919cd7686a3eb566907


Other Common Detection Aliases

Company NamesDetection Names
avastWin32:Dropper-DPN [Trj]
AVG (GriSoft)Downloader.Agent2.ADGF (Trojan horse)
aviraTR/Dropper.Gen
KasperskyHEUR:Trojan.Win32.Generic
BitDefenderTrojan.Generic.KDV.61992
Dr.WebDLOADER.Trojan (probably)
F-ProtW32/ChinaTroj.A.gen!Eldorado
FortiNetW32/Dloadr.DEF!tr
Microsofttrojandownloader:win32/small.aia
SymantecTrojan.ADH
EsetWin32/TrojanDownloader.Small.PAL trojan (variant)
normanDloader.AMPUF (trojan)
pandaSuspicious
risingWorm.Win32.Deng.c
SophosTroj/Dloadr-DEF
Trend MicroTROJ_GEN.R31C2KQ
vba32TrojanDownloader.Agent.esxc
V-BusterTrojan.DR.Skintrim.Gen (mutant)
Vet (Computer Associates)Win32/Small.QR

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


ActivitiesRisk Levels
Enumerates many system files and directories.Low
Process attempts to call itself recursivelyLow
No digital signature is presentInformational


McAfee ScansScan Detections
McAfee BetaGeneric Downloader.gn
McAfee SupportedGeneric Downloader.gn



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:

37688AD85097A7CEDB47C919CD7686A3EB566907

The following files have been added to the system:

  • %WINDIR%\Googletk.exe

The following files were temporarily written to disk then later removed:

  • %WINDIR%\Debugs.inf
  • %TEMP%\43400.jpg
  • C:\MyTemp

The following registry elements have been changed:

  • HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\WINDOWS NT\CURRENTVERSION\WINLOGON\USERINIT = %WINDIR%\SYSTEM32\userinit.exe,%WINDIR%\Googletk.exe

The applications attempted the following network connection(s):

  • hxxp://730ad.com/*****
  • 121.12.125.***:80

   

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.

   

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