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Discovered: May 08, 2001
Updated: February 13, 2007 11:53:30 AM
Also Known As: sadmind/IIS, Backdoor.Sadmind.dr
Type: Worm

Backdoor.Sadmind is a backdoor worm program that may affect systems that are running unpatched versions of Microsoft IIS or unpatched versions of Solaris.

If files on a desktop computer are detected as Backdoor.Sadmind.Dr, that does not mean that there is an infection. It means that you have visited a Website whose server has been compromised by Backdoor.Sadmind, which replicates only on Solaris systems. You should delete any files detected as Backdoor.Sadmind.Dr.

CERT has issued an advisory regarding sadmind-IIS:

Microsoft Corporation
The following documents regarding this vulnerability are available from Microsoft:

Sun Microsystems
Sun has issued the following bulletin for this vulnerability:

NOTE: The patch closes the security hole on Solaris systems that Backdoor.Sadmind uses to infect a system. Left unpatched, other malicious programs could take advantage of the same vulnerability. The best way to close the vulnerable ports is to use the security patch.

Antivirus Protection Dates

  • Initial Rapid Release version May 10, 2001
  • Latest Rapid Release version September 28, 2010 revision 054
  • Initial Daily Certified version May 10, 2001
  • Latest Daily Certified version September 28, 2010 revision 036

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

Writeup By: Cary Ng

Discovered: May 08, 2001
Updated: February 13, 2007 11:53:30 AM
Also Known As: sadmind/IIS, Backdoor.Sadmind.dr
Type: Worm

Backdoor.Sadmind attempts to spread on systems that have unpatched versions of Solaris installed by using a buffer overflow exploit on a program named Sadmind. Backdoor.Sadmind uses TCP port 600 on the Solaris computer to listen. Two directories are created:


These directories contain a list of compromised computers and the tools used by Backdoor.Sadmind. Several scripts will also be running on the Solaris computers such as and

Backdoor.Sadmind also victimizes systems that have unpatched versions of Microsoft IIS. It replaces the default Web page file so that the Web server displays the new Web pages instead of the default pages. These pages contain profane remarks against the government, and the text:



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: Cary Ng

Discovered: May 08, 2001
Updated: February 13, 2007 11:53:30 AM
Also Known As: sadmind/IIS, Backdoor.Sadmind.dr
Type: Worm

Delete all files detected by Norton Antivirus as Backdoor.Sadmind or Backdoor.Sadmind.Dr.

A patch is available from Microsoft at

NOTE : This patch is included in Service Pack 2

For IIS Version 4:

For IIS Version 5:

Additional advice on securing IIS web servers is available from

Apply a patch from Sun Microsystems as described in Sun Security Bulletin #00191:

Writeup By: Cary Ng