W32.HLLW.Manex

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Discovered: November 11, 2002
Updated: February 13, 2007 11:57:06 AM
Also Known As: Worm.Win32.Manex [Kaspersky]
Type: Worm
Systems Affected: Windows


W32.HLLW.Manex is a worm that is written in Delphi and C++. It spreads to shares of computers whose IP addresses start with 188.1 . These addresses correspond to hosts on the (German) dfn.de network.

Antivirus Protection Dates

  • Initial Rapid Release version November 11, 2002
  • Latest Rapid Release version November 11, 2002
  • Initial Daily Certified version November 11, 2002
  • Latest Daily Certified version November 11, 2002
  • Initial Weekly Certified release date November 13, 2002

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

Writeup By: Frederic Perriot

Discovered: November 11, 2002
Updated: February 13, 2007 11:57:06 AM
Also Known As: Worm.Win32.Manex [Kaspersky]
Type: Worm
Systems Affected: Windows


When W32.HLLW.Manex runs, it displays a message that begins with the following text:

send 188.1.255.255

It pings random IP addresses of the form 188.1.x.y . If a computer replies to the ping, the worm attempts to infect all disk shares that are on it.

When W32.HLLW.Manex infects a share, it looks for .exe files and replaces them with a copy of itself (possibly padded with random data if the original file is larger than the worm executable). If it can not find an .exe file to overwrite, it uses one of the following names when it creates a slightly modified copy of itself on the share:

  • <a random number below 999999>.exe
  • Animation.exe
  • <|ac_f_> - Go Home.exe, where the first few characters in angle brackets may be printed differently on different machines
  • Stereo.exe
  • DX8Test3D.exe
  • Sex&Money.exe

W32.HLLW.Manex listens on port UDP/34251 for a special datagram that triggers the payload if the date is September 1, 2002. When the payload is triggered, the worm performs a Denial of Service attack against IP address 188.1.10.48 and deletes all files that have the following extensions on drives C through G:
  • .doc
  • .rtf
  • .dot
  • .xls
  • .dwg
  • .txt
  • .dat
  • .prt


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: Frederic Perriot

Discovered: November 11, 2002
Updated: February 13, 2007 11:57:06 AM
Also Known As: Worm.Win32.Manex [Kaspersky]
Type: Worm
Systems Affected: Windows


NOTE: These instructions are for all current and recent Symantec antivirus products, including the Symantec AntiVirus and Norton AntiVirus product lines.

  1. Update the virus definitions.
  2. Run a full system scan, and delete all files that are detected as W32.HLLW.Manex.

For details on how to do this, read the following instructions.

To update the virus definitions:
All virus definitions receive full quality assurance testing by Symantec Security Response before being posted to our servers. There are two ways to obtain the most recent virus definitions:
  • Run LiveUpdate, which is the easiest way to obtain virus definitions. These virus definitions are posted to the LiveUpdate servers once each week (usually Wednesdays) unless there is a major virus outbreak. To determine whether definitions for this threat are available by LiveUpdate, look at the Virus Definitions (LiveUpdate) line at the top of this write-up.
  • Download the definitions using the Intelligent Updater. Intelligent Updater virus definitions are posted on U.S. business days (Monday through Friday). They must be downloaded from the Symantec Security Response Web site and installed manually. To determine whether definitions for this threat are available by the Intelligent Updater, look at the Virus Definitions (Intelligent Updater) line at the top of this write-up.

    Intelligent Updater virus definitions are available here. For detailed instructions on how to download and install the Intelligent Updater virus definitions from the Symantec Security Response Web site, click here.

To scan for and delete the infected files:
  1. Start your Symantec antivirus program, and make sure that it is configured to scan all files.
  2. Run a full system scan.
  3. If any files are detected as infected with W32.HLLW.Manex, click Delete.
  4. Restore overwritten or deleted files from backups.


Writeup By: Frederic Perriot