W32.HLLP.Scrambler

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Updated: February 13, 2007 11:56:58 AM
Also Known As: VBS.Scrambled
Type: Virus


This Windows virus infects EXE files on local machines. It also exhibits worm-like behavior by sending itself through email using Microsoft Outlook and through Internet Relay Chat via mIRC. The file "Scrambler.VBS" is dropped by the virus, and if mIRC is installed, the file "Script.INI" will be dropped in the mIRC program folder.

Antivirus Protection Dates

  • Initial Rapid Release version May 30, 2000
  • Latest Rapid Release version August 08, 2016 revision 023
  • Initial Daily Certified version May 30, 2000
  • Latest Daily Certified version August 09, 2016 revision 001

Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

Writeup By: Edric Ta

Updated: February 13, 2007 11:56:58 AM
Also Known As: VBS.Scrambled
Type: Virus


Through the header information of the virus, it was determined that this virus was created some time on May 26, 2000. The virus prepends itself to EXE files on local machines and it drops two files: Scramble.VBS and Script.INI.
The virus also exhibits worm-like behaviors. The "Scramble.VBS" file uses MAPI calls to the Microsoft Outlook application and creates messages by iterating through all the addresses in the Microsoft Outlook Address Book.

The subject of the email is: Check this out, it's funny!

The attachment will be the virus itself in the form of an executable file with a randomly generated filename.
The virus may also spread via mIRC by creating a "Script.INI" file in the mIRC program directory, which sends the polymorphic EXE file to other users.

Recommendations

Symantec Security Response encourages all users and administrators to adhere to the following basic security "best practices":

  • Use a firewall to block all incoming connections from the Internet to services that should not be publicly available. By default, you should deny all incoming connections and only allow services you explicitly want to offer to the outside world.
  • Enforce a password policy. Complex passwords make it difficult to crack password files on compromised computers. This helps to prevent or limit damage when a computer is compromised.
  • Ensure that programs and users of the computer use the lowest level of privileges necessary to complete a task. When prompted for a root or UAC password, ensure that the program asking for administration-level access is a legitimate application.
  • Disable AutoPlay to prevent the automatic launching of executable files on network and removable drives, and disconnect the drives when not required. If write access is not required, enable read-only mode if the option is available.
  • Turn off file sharing if not needed. If file sharing is required, use ACLs and password protection to limit access. Disable anonymous access to shared folders. Grant access only to user accounts with strong passwords to folders that must be shared.
  • Turn off and remove unnecessary services. By default, many operating systems install auxiliary services that are not critical. These services are avenues of attack. If they are removed, threats have less avenues of attack.
  • If a threat exploits one or more network services, disable, or block access to, those services until a patch is applied.
  • Always keep your patch levels up-to-date, especially on computers that host public services and are accessible through the firewall, such as HTTP, FTP, mail, and DNS services.
  • Configure your email server to block or remove email that contains file attachments that are commonly used to spread threats, such as .vbs, .bat, .exe, .pif and .scr files.
  • Isolate compromised computers quickly to prevent threats from spreading further. Perform a forensic analysis and restore the computers using trusted media.
  • Train employees not to open attachments unless they are expecting them. Also, do not execute software that is downloaded from the Internet unless it has been scanned for viruses. Simply visiting a compromised Web site can cause infection if certain browser vulnerabilities are not patched.
  • If Bluetooth is not required for mobile devices, it should be turned off. If you require its use, ensure that the device's visibility is set to "Hidden" so that it cannot be scanned by other Bluetooth devices. If device pairing must be used, ensure that all devices are set to "Unauthorized", requiring authorization for each connection request. Do not accept applications that are unsigned or sent from unknown sources.
  • For further information on the terms used in this document, please refer to the Security Response glossary.

Writeup By: Edric Ta

Updated: February 13, 2007 11:56:58 AM
Also Known As: VBS.Scrambled
Type: Virus


Norton Antivirus will detect the virus as W32.HLLP.Scrambler. The .VBS file will be detected as VBS.Scrambler. These files should be deleted. Users of mIRC should also delete "Script.INI" from the mIRC program directory.

Writeup By: Edric Ta