This page shows details and results of our analysis on the malware W32/Sdbot.worm!g!c540dfcca461

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Threat Detail

  • Malware Type: Virus
  • Malware Sub-type: N/A
  • Protection Added: 2009-06-03

This is a virus detection. Viruses are programs that self-replicate recursively, meaning that infected systems spread the virus to other systems, which then further propagate the virus. Although many viruses contain a destructive payload, it's quite common for viruses to do nothing more than spread from one system to another.

Minimum Engine


File Length


Description Added


Description Modified


Malware Proliferation

File PropertyProperty Value
McAfee ArtemisArtemis!c540dfcca461
McAfee DetectionW32/Sdbot.worm!g
Length688,128 bytes

Other Common Detection Aliases

Company NameDetection Name
AVG (GriSoft)Klone.AE
Vet (Computer Associates)

Avert® Labs has observed the following system activities:

ActivityRisk Level
Enumerates open windows
Program often suspends itself
Uses shared memory of other processes
Writes executable in the windows folder
Registers DLLsInformational

This sample can be identified by the following symptoms.

System Changes

These are general defaults for typical path variables. (Although they may differ, these examples are common.):
%WinDir% = \WINDOWS (Windows 9x/ME/XP/Vista), \WINNT (Windows NT/2000)
%SystemDir% = \WINDOWS\SYSTEM (Windows 98/ME), \WINDOWS\SYSTEM32 (Windows XP/Vista), \WINNT\SYSTEM32 (Windows NT/2000)
%ProgramFiles% = \Program Files

The following files were analyzed:

  • %USERPROFILE%\local settings\temp\be5439c78a217bfba0fca15d3d1d65d54354e65d.exe
  • The following files have been added to the system:

  • %ALLUSERSPROFILE%\application data\temp
  • %WINDIR%\config\csrss.exe
  • The following registry elements have been created:

  • HKEY_LOCAL_MACHINE\software\classes\clsid\{74e902b0-4d42-e37e-ec7f-de7a8389195a}\
    • bvwgd = oihuto}jcbedc]rlc`dgfzm{t{mq
    • bvwgd = oihuto}jsbedc]rls`dgfzm{t{mq
    • czdi = wgeyqkjmphg]owrcmmesxjm
    • dwaw = pvg|weofd\ejvtioxgiiifvs`ktvj
    • etmecqqpghr = img[\dewfdlfft_gewkolz{hzhwf
    • etmecqqpghr = img[\dewfdlfft_gewkopz{hzhjn
    • webaaedvmofub = cp{okwbjkkfgbuq[hplxo{qrsuahue{i
    • wskfzu = ]{f`
    • wskfzu = tzb@
  • HKEY_LOCAL_MACHINE\software\classes\clsid\{74e902b0-4d42-e37e-ec7f-de7a8389195a}\inprocserver32\
    • (default) = c:\windows\system32\catsrvut.dll
    • threadingmodel = both
  • HKEY_LOCAL_MACHINE\software\licenses\
    • {0c6e3d0636b8b23b2} = [binary data]
    • {ic6e3d0636b8b23b2} = 1
    • {ic6e3d0636b8b23b2} = 2
    • {ic6e3d0636b8b23b2} = 3
    • {ic6e3d0636b8b23b2} = 4
    • {ic6e3d0636b8b23b2} = 5
    • {ic6e3d0636b8b23b2} = 6
    • {k7c0db872a3f777c0} = [binary data]
    • {r7c0db872a3f777c0} = 345626
  • HKEY_LOCAL_MACHINE\Software\Microsoft\rfc1156agent\currentversion\parameters\
    • trappolltimemillisecs = 1080
  • The following registry elements have been changed:

  • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows nt\currentversion\winlogon\
    • shell = explorer.exe c:\windows\config\csrss.exe
  • This symptoms of this detection are the files, registry, and network communication referenced in the characteristics section.

    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.

    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.