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Virus Profile: W32/YahLover.worm.gen.l!8BAA4622C86B

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Virus Profile information details
Risk Assessment: Home Low | Corporate Low
Date Discovered: 2/12/2013
Date Added: 2/12/2013
Origin: Unknown
Length: 745029
Type: Trojan
Subtype: Win32
DAT Required: 6984
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 DetectionW32/YahLover.worm.gen.l
Length745029 bytes
MD58baa4622c86b6ef5db0eed1418beb8bf
SHA175dc103a15af672752d719c3d8d391721563617e


Other Common Detection Aliases

Company NamesDetection Names
EMSI SoftwareWorm.Win32.AutoRun!IK
ahnlabWorm/Win32.AutoRun
AVG (GriSoft)Worm/Autorun.KE
aviraWorm/Autorun.aaer
KasperskyWorm.Win32.Autorun.fnc
BitDefenderGen:Trojan.Heur.AutoIT.2
clamavPUA.Win32.Packer.PrivateExeProte-15
Dr.WebTrojan.StartPage.41341
F-Protw32/autorun.sx
FortiNetW32/AutoVt.AAAC!tr
MicrosoftWorm:Win32/Tupym.A
SymantecW32.Imaut
EsetWin32/Autoit.EB
normanw32/obfuscated.h3!genr
risingTrojan.Win32.AutoRun.air
SophosW32/AutoRun-BUC
vba32Trojan-Downloader.Autoit.gen
Vet (Computer Associates)Win32/Yahlover.LX

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


ActivitiesRisk Levels
Attempts to create Autorun.inf configuration files on accessible drives that instructs Windows operating systems to run a file when the disk is connected.High
Modifies winlogon configuration settings in registryMedium
Adds or modifies winlogon shell registry value. Could be used to launch a program on startup.Medium
Enumerates many system files and directories.Low
Adds or modifies Internet Explorer cookiesLow
No digital signature is presentInformational


McAfee ScansScan Detections
McAfee BetaW32/YahLover.worm.gen.l
McAfee SupportedW32/YahLover.worm.gen.l



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:

75DC103A15AF672752D719C3D8D391721563617E

The following files have been added to the system:

  • %WINDIR%\system3_.exe
  • %WINDIR%\SYSTEM32\system3_.exe
  • %WINDIR%\SYSTEM32\autorun.ini

The following files have been changed:

  • %TEMP%orary Internet Files\Content.IE5\index.dat

The following registry elements have been created:

  • HKEY_CURRENT_USER\SOFTWARE\POLICIES\MICROSOFT\INTERNET EXPLORER\
  • HKEY_CURRENT_USER\SOFTWARE\POLICIES\MICROSOFT\INTERNET EXPLORER\CONTROL PANEL\
  • HKEY_LOCAL_MACHINE\SOFTWARE\POLICIES\MICROSOFT\INTERNET EXPLORER\
  • HKEY_LOCAL_MACHINE\SOFTWARE\POLICIES\MICROSOFT\INTERNET EXPLORER\CONTROL PANEL\

The following registry elements have been changed:

  • HKEY_CURRENT_USER\SOFTWARE\MICROSOFT\INTERNET EXPLORER\MAIN\START PAGE = http://www.mydreamworld.50webs.com
  • HKEY_CURRENT_USER\SOFTWARE\MICROSOFT\WINDOWS\CURRENTVERSION\RUN\YAHOO MESSENGGER = %WINDIR%\SYSTEM32\system3_.exe
  • HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\INTERNET EXPLORER\MAIN\DEFAULT_PAGE_URL = http://www.mydreamworld.50webs.com
  • HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\INTERNET EXPLORER\MAIN\DEFAULT_SEARCH_URL = http://www.mydreamworld.50webs.com
  • HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\INTERNET EXPLORER\MAIN\SEARCH PAGE = http://www.mydreamworld.50webs.com
  • HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\INTERNET EXPLORER\MAIN\START PAGE = http://www.mydreamworld.50webs.com
  • HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\WINDOWS NT\CURRENTVERSION\WINLOGON\SHELL = Explorer.exe system3_.exe
  • HKEY_LOCAL_MACHINE\SYSTEM\ControlSet\SERVICES\SCHEDULE\ATTASKMAXHOURS = 0

The applications attempted the following network connection(s):

  • 199.59.243.***:80
  • 204.13.161.***:80
  • hxxp://h1.ripway.com/asdb000/*****

   

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.