For Consumer

Virus Profile: W32/Autorun.worm.b!77638ED1BAB6

Threat Search
Print
   
Virus Profile information details
Risk Assessment: Home Low | Corporate Low
Date Discovered: 1/25/2013
Date Added: 1/25/2013
Origin: Unknown
Length: 114688
Type: Trojan
Subtype: Win32
DAT Required: 6966
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/Autorun.worm.b
Length114688 bytes
MD577638ed1bab6d702bf08ba9d7c94b349
SHA1453dc839b98a5705561ed69c46ea5ed170c8a820


Other Common Detection Aliases

Company NamesDetection Names
AVG (GriSoft)Win32/Heur.dropper
aviraTR/Crypt.XPACK.Gen
KasperskyWorm.Win32.AutoRun.pmk
BitDefenderTrojan.Downloader.Agent.ZQD
clamavTrojan.Agent-54281
Dr.WebWin32.HLLW.Autoruner.2762
F-ProtW32/DldrX.BBZM
FortiNetW32/AutoRun.PMK!worm
MicrosoftTrojan:Win32/Delf.DC
SymantecW32.SillyFDC
EsetWin32/AutoRun.Delf.KG worm
normanW32/AutoRun.FZC
pandaW32/Autorun.JDJ.worm
risingWorm.Win32.Autorun.ewc
SophosMal/EncPk-RY
vba32Trojan-Dropper.Win32.Agent.ddc
V-BusterWorm.AutoRun!U190IihVGhA
Vet (Computer Associates)Win32/SillyAutorun.QF

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
Enumerates many system files and directories.Low
Adds or modifies Internet Explorer cookiesLow
No digital signature is presentInformational


McAfee ScansScan Detections
McAfee BetaW32/Autorun.worm.b
McAfee SupportedW32/Autorun.worm.b



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:

453DC839B98A5705561ED69C46EA5ED170C8A820

The following files have been added to the system:

  • C:\autorun.inf
  • C:\74630177.EXE
  • %WINDIR%\SYSTEM32\winsos.exe
  • %WINDIR%\SYSTEM32\winsn.exe
  • %WINDIR%\SYSTEM32\shovth.exe

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

  • C:\0001
  • C:\0002
  • %TEMP%\$mad$res$000004e8$9204ac$
  • %TEMP%\FilF.tmp
  • %TEMP%\$mad$res$0000075c$9004ac$
  • %TEMP%\Fil8.tmp

The following registry elements have been changed:

  • HKEY_CURRENT_USER\SOFTWARE\MICROSOFT\WINDOWS\CURRENTVERSION\EXPLORER\ADVANCED\HIDDEN = 49
  • HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\WINDOWS\CURRENTVERSION\RUN\SIS32 = %WINDIR%\SYSTEM32\winsos.exe
  • HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\WINDOWS\CURRENTVERSION\RUN\WINROOT = %WINDIR%\SYSTEM32\winsn.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.