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Virus Profile: W32/Yahlover.worm!9AA39042D2FE

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Virus Profile information details
Risk Assessment: Home Low | Corporate Low
Date Discovered: 1/29/2013
Date Added: 1/29/2013
Origin: Unknown
Length: 135680
Type: Trojan
Subtype: Win32
DAT Required: 6969
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
Length135680 bytes
MD59aa39042d2fe5e04d4787ab0a70c9a2e
SHA14e2b0140620e7eaa0eb2846f6a9655c8442551ac


Other Common Detection Aliases

Company NamesDetection Names
avastWin32:Rootkit-gen
Dr.WebTrojan.Opclose
F-ProtW32/Trojan2.MPL
MicrosoftWorm:Win32/SillyFDC.E
SymantecW32.SillyFDC
normanw32/obfuscated.h3!genr
SophosMal/Behav-043
Trend MicroMal_OtorunN
vba32Worm.AutoRun.gog

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


ActivitiesRisk Levels
Modifies Windows explorer file browser's Advanced settings. Sometimes used by malware to make executable files look like documents.Medium
Attempts to launch an instance of the Windows file system explorer.Low
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
McAfee SupportedW32/YahLover.worm



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:

4E2B0140620E7EAA0EB2846F6A9655C8442551AC

The following files have been added to the system:

  • %WINDIR%\SYSTEM32\rundII32.exe
  • %WINDIR%\SYSTEM32\msng.exe
  • %WINDIR%\SYSTEM32\rundll32.exe

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

  • C:\~0002ftd.tmp

The following registry elements have been created:

  • HKEY_CURRENT_USER\SOFTWARE\VB AND VBA PROGRAM SETTINGS\
  • HKEY_CURRENT_USER\SOFTWARE\VB AND VBA PROGRAM SETTINGS\SVCHOST\
  • HKEY_CURRENT_USER\SOFTWARE\VB AND VBA PROGRAM SETTINGS\SVCHOST\OPEN\

The following registry elements have been changed:

  • HKEY_CURRENT_USER\SOFTWARE\MICROSOFT\INTERNET EXPLORER\TOOLBAR\LOCKED = 1
  • HKEY_CURRENT_USER\SOFTWARE\MICROSOFT\WINDOWS\CURRENTVERSION\EXPLORER\ADVANCED\HIDEFILEEXT = 49
  • HKEY_CURRENT_USER\SOFTWARE\VB AND VBA PROGRAM SETTINGS\SVCHOST\OPEN\TIMES = 49
  • HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\WINDOWS\CURRENTVERSION\RUN\MSNG = %WINDIR%\SYSTEM32\msng.exe

   

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.