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Virus Profile: W32/YahLover.worm.gen!3997AC53AF77

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Virus Profile information details
Risk Assessment: Home Low | Corporate Low
Date Discovered: 2/6/2013
Date Added: 2/6/2013
Origin: Unknown
Length: 2799812
Type: Virus
Subtype: Win32
DAT Required: 6977
Removal Instructions
   
 
 
   

Description

Viruses are self-replicating. They are often spread by a network or by transmission to a removable medium such as a removable disk, writable CD, or USB drive. Viruses may also spread by infecting files on a network file system or a file system that is shared by another computer.

Indication of Infection

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

Methods of Infection

Viruses are self-replicating. They are often spread by a network or by transmission to a removable medium such as a removable disk, writable CD, or USB drive. Viruses may also spread by infecting files on a network file system or a file system that is shared by another computer.

   

Virus Characteristics

This is a Virus

File PropertiesProperty Values
McAfee DetectionW32/YahLover.worm.gen
Length2799812 bytes
MD53997ac53af77303fd6f4ad87a0d4e7fa
SHA1a1a297e5bdb0d1aabf52418396dcda6f6c21e853


Other Common Detection Aliases

Company NamesDetection Names
EMSI SoftwareGen:Trojan.Heur.AutoIT.2 (B)
ahnlabWorm/Win32.Hakaglan
AVG (GriSoft)virus (suspicious)
aviraTR/Dropper.Gen
KasperskyTrojan.Win32.Autoit.zu
BitDefenderGen:Trojan.Heur.AutoIT.2
clamavPUA.Win32.Packer.PrivateExeProte-15
Dr.WebWin32.HLLW.Autoruner.58495
FortiNetW32/Nuqel.A!tr
MicrosoftWorm:Win32/Nuqel.K
SymantecW32.Imaut!gen1
EsetWin32/Sohanad.NEW worm
normanW32/Obfuscated.H2!genr
risingWorm.Win32.Nuqel.a
SophosW32/Nuqel-A
Trend MicroTROJ_SPNR.15F412
vba32Trojan.Autoit.F
V-BusterTrojan.AutoIT.AM
Vet (Computer Associates)Win32/fakeFLDR_i

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


ActivitiesRisk Levels
Prevents the use of the default Windows Registry Editor.High
Disables the Windows Task Manager.High
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
Adds or modifies system policies. Could be used to prevent the or detour the use of common system tools.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
Enumerates process listLow
Adds or modifies Internet Explorer cookiesLow
No digital signature is presentInformational


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



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:

A1A297E5BDB0D1AABF52418396DCDA6F6C21E853

The following files have been added to the system:

  • %WINDIR%\hinhem.scr
  • %WINDIR%\SYSTEM32\autorun.ini
  • %WINDIR%\SYSTEM32\scvshosts.exe
  • %WINDIR%\scvshosts.exe
  • %WINDIR%\SYSTEM32\blastclnnn.exe
  • %WINDIR%\SYSTEM32\setting.ini

The following registry elements have been created:

  • HKEY_CURRENT_USER\SOFTWARE\MICROSOFT\WINDOWS\CURRENTVERSION\POLICIES\SYSTEM\

The following registry elements have been changed:

  • HKEY_CURRENT_USER\SOFTWARE\MICROSOFT\WINDOWS\CURRENTVERSION\EXPLORER\WORKGROUPCRAWLER\SHARES\SHARED = \New Folder.exe
  • HKEY_CURRENT_USER\SOFTWARE\MICROSOFT\WINDOWS\CURRENTVERSION\POLICIES\EXPLORER\NOFOLDEROPTIONS = 1
  • HKEY_CURRENT_USER\SOFTWARE\MICROSOFT\WINDOWS\CURRENTVERSION\POLICIES\SYSTEM\DISABLEREGISTRYTOOLS = 1
  • HKEY_CURRENT_USER\SOFTWARE\MICROSOFT\WINDOWS\CURRENTVERSION\POLICIES\SYSTEM\DISABLETASKMGR = 1
  • HKEY_CURRENT_USER\SOFTWARE\MICROSOFT\WINDOWS\CURRENTVERSION\RUN\YAHOO MESSENGGER = %WINDIR%\SYSTEM32\scvshosts.exe
  • HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\WINDOWS NT\CURRENTVERSION\WINLOGON\SHELL = Explorer.exe scvshosts.exe
  • HKEY_LOCAL_MACHINE\SYSTEM\ControlSet\SERVICES\SCHEDULE\ATTASKMAXHOURS = 0

The applications attempted the following network connection(s):

  • 75.98.17.**: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.