Threat Explorer

The Threat Explorer is a comprehensive resource consumers can turn to for daily, accurate, up-to-date information on the latest threats, risks and vulnerabilities.

Adware.Sheldor

Adware.Sheldor

Updated:
February 13, 2007
Risk Impact:
High
File Names:
AdServerCJ.exe
Systems Affected:
Windows

Behavior


Adware.Sheldor is an adware program that displays advertisements for an adult-content Web site. It is written in the Delphi programming language and packed with ASPack.

Note : Virus definitions dated January 28, 2005 or earlier may detect this threat as Backdoor.Sheldor.

Symptoms


The files on the system are detected as Adware.Sheldor.

Behavior


This adware component must be manually installed, or installed as a component of another program.

Antivirus Protection Dates

  • Initial Rapid Release version October 02, 2014 revision 022
  • Latest Rapid Release version March 23, 2017 revision 037
  • Initial Daily Certified version January 28, 2005 revision 002
  • Latest Daily Certified version March 23, 2017 revision 041
  • Initial Weekly Certified release date February 02, 2005
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

When Adware.Sheldor is executed, it does the following:

  1. Displays the error message:

    "E47250: Incorrect MPEG Data format"

  2. Copies itself as %System%\Shellexpl.exe or %System%\shellexp.exe

    Note: %System% is a variable. The Trojan locates the System folder and copies itself to that location. By default, this is C:\Windows\System (Windows 95/98/Me), C:\Winnt\System32 (Windows NT/2000), or C:\Windows\System32 (Windows XP).

  3. Adds one of the following values:

    "Explorer"="%System%\Shellexpl.exe"
    "Explorer"="%System%\shellexp.exe en.." 

    to one of the following registry keys:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

    so that the Adware runs when Windows starts.

  4. Creates one or more of the following configuration files:

    • %System%\Hndldt.ini
    • %System%\Winhndl.ini
    • %System%\windll.ini

  5. Modifies the Hosts file (located at %SYSTEM%\drivers\etc\hosts in Windows XP and 2K and %Windir%\hosts in Windows 98/ME) by adding the line:

    64.237.37.47 auto.search.msn.com

    which redirects searches to Adware.Sheldor's search site.

    Note: %Windir% is a variable that refers to the Windows installation folder. By default, this is C:\Windows or C:\Winnt.

  6. Monitors any new cookies that are created. If the cookies contain certain keywords, advertisements for an adult-content Web site will be displayed.

    The following keywords trigger advertisements:

    • adult
    • adware
    • amateur
    • anal
    • babes
    • bbw
    • bdsm
    • blowjob
    • bondage
    • cartrige
    • casino
    • celeb
    • centerfold
    • chubby
    • cumshot
    • dating
    • diet
    • digital camera
    • DVD
    • ebony
    • escort
    • facial
    • fat
    • fetish
    • ffm
    • fisting
    • gambling
    • gangbang
    • gay
    • grann
    • groupsex
    • hairy
    • hardcore
    • health
    • hentai
    • horoscope
    • hosting
    • hunks
    • incest
    • insurance
    • interracial
    • jobs
    • lesb
    • lingerie
    • loan
    • lolita
    • manga
    • mature
    • midget
    • milf
    • mmf
    • mortgage
    • mp3 player
    • naturist
    • nudist
    • older
    • orgy
    • panty
    • peeing
    • penis enlargement
    • perfume
    • pharma
    • pheromones
    • phone
    • pills
    • piss
    • plump
    • poker
    • preg
    • rape
    • ringtones
    • sexual+enhancement
    • shemale
    • spyware
    • teens
    • teeny
    • toon
    • top
    • tranny
    • travel
    • twinks
    • viagra
    • virgin
    • voyeur
    • watersport
    • webserver
    • weight loss
    • wive
    • xxx



The following instructions pertain to all Symantec antivirus products that support Security Risk detection.
  1. Update the definitions.
  2. Run a full system scan.
  3. Delete the value that was added to the registry.
For specific details on each of these steps, read the following instructions.

1. To update the definitions
To obtain the most recent definitions, start your Symantec program and run LiveUpdate.


2. To run the scan
  1. Start your Symantec antivirus program, and then run a full system scan.
  2. If any files are detected as Adware.Sheldor and depending on which software version you are using, you may see one or more of the following options:

    Note: This applies only to versions of Norton AntiVirus that support Security Risk detection. If you are running a version of Symantec AntiVirus Corporate Edition that supports Security Risk detection, and Security Risk detection has been enabled, you will only see a message box that gives the results of the scan. If you have questions in this situation, contact your network administrator.
    • Exclude (Not recommended): If you click this button, it will set the threat so that it is no longer detectable. That is, the antivirus program will keep the security risk on your computer and will no longer detect it to remove from your computer.

    • Ignore or Skip: This option tells the scanner to ignore the threat for this scan only. It will be detected again the next time that you run a scan.

    • Cancel: This option is new to Norton Antivirus 2005. It is used when Norton Antivirus 2005 has determined that it cannot delete a security risk. This Cancel option tells the scanner to ignore the threat for this scan only, and thus, the threat will be detected again the next time that you run a scan.

      To actually delete the security risk:
      • Click its file name (under the Filename column).
      • In the Item Information box that displays, write down the full path and file name.
      • Then use Windows Explorer to locate and delete the file.

        If Windows reports that it cannot delete the file, this indicates that the file is in use. In this situation, complete the rest of the instructions on this page, restart the computer in Safe mode, and then delete the file using Windows Explorer.

    • Delete: This option will attempt to delete the detected files. In some cases, the scanner will not be able to do this.
      • If you see a message, "Delete Failed" (or similar message), manually delete the file.
      • Click the file name of the threat that is under the Filename column.
      • In the Item Information box that displays, write down the full path and file name.
      • Then use Windows Explorer to locate and delete the file.

        If Windows reports that it cannot delete the file, this indicates that the file is in use. In this situation, complete the rest of the instructions on this page, restart the computer in Safe mode, and then delete the file using Windows Explorer.


3. To delete the value from the registry
Important: Symantec strongly recommends that you back up the registry before making any changes to it. Incorrect changes to the registry can result in permanent data loss or corrupted files. Modify the specified subkeys only. Read the document, "How to make a backup of the Windows registry ," for instructions.
  1. Click Start > Run.
  2. Type regedit

    Then click OK.

  3. Navigate to the subkey:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

  4. In the right pane, delete the value, if exists:

    "Explorer"="%System%\Shellexpl.exe"
    "Explorer"="%System%\shellexp.exe en.."

  5. Navigate to the subkey:

    HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

  6. In the right pane, delete the value, if exists:

    "Explorer"="%System%\Shellexpl.exe"
    "Explorer"="%System%\shellexp.exe en.."

  7. Exit the Registry Editor.

  8. Open the Host file (located at %SYSTEM%\drivers\etc\hosts in Windows XP and 2K and %Windir%\hosts in Windows 98/ME) by any text editor (notepad.exe).

    Note: %Windir% is a variable that refers to the Windows installation folder. By default, this is C:\Windows or C:\Winnt.

  9. Remove the following line:

    64.237.37.47 auto.search.msn.com

  10. Exit the text editor.