Threat Description



Category: Malware
Platform: W32
Aliases: Sadmind, Sadmind/IIS, Unix/Sadmind, Solaris/Sadmind.worm, Worm.PoizonBox


Sadmind is a worm, that propagates from a Sun Solaris machine to another. It also compromises Windows NT/2000 servers running Internet Information Server 4.0 or 5.0.


Automatic action

Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.

More scanning & removal options

More information on scanning or removal options is available in the documentation for your F-Secure security product on the Downloads section of our Home - Global site.

You may also refer to the Knowledge Base on the F-Secure Community site for more information.

Contact Support

For further assistance, F-Secure customers can request support online via the Request support or the Chat forms on our Home - Global site.

Technical Details


The worm uses an old vulnerability in the Solaris operating system to enter the system. In the system it first opens remote shell (rsh) service for the root user. It then extracts itself to "/dev/cuc" directory, and adds a worm startup code to the "/etc/rc2.d/S71rpc". The worm also attempts to download and install Perl on the system, and starts itself by executing "/dev/cuc/" on the victim using the rsh service.

"" creates a directory "/dev/cup", and starts worms main processes in the background.

The worm goes through random Class-B subnets looking for unpatched Windows NT/2000 machines running IIS web server. If a vulnerable machine is found, the worm will copy the "\winnt\system32\cmd.exe" to "wwwroot\scripts\root.exe" directory and replace "index.htm", "index.asp", "default.htm" and "default.asp" files with its own.

Sadmind also looks for vulnerable Solaris systems from randon Class-B networks. If a vulnerable host is found, the worm creates a tar archive "uni.tar" out of itself, and sends it to the victim using rsh service.

Both vulnerabilities have been fixed by vendors.

Futher information about the problem and the fix in sandmind service in Solaris is available from Sun:

Further information about the IIS unicode vulnerability, including a fix, is available from Microsoft at: and additional information at:

Technical Details:Sami Rautiainen, F-Secure; May 2001


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