Threat description




Rizal is a trojan that damages critical system files. The trojan is a Windows NE (16-bit) file 14kb long.


Automatic action

Depending on the settings of your F-Secure security product, it will either automatically delete, quarantine or rename the suspect file, or ask you for a desired action.

More scanning & removal options

More information on the scanning and removal options available in your F-Secure product can be found in the Help Center.

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

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

Technical Details

When run the trojan first adds a big amount of similar command blocks AUTOEXEC.BAT. These commands will clear screen, output the below given messages and wait for key to be pressed.

	-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- 	   R I Z A L I A N    T R O J A N 	PROGRAMMED BY: THE HAMMER HEAD TEAM     Computer Science Dept. Jose Rizal University        Shaw BLVD Mandaluyong City Philppines LARRY CONANAN and BENITO TY 	-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-  

Then the trojan destroys MSDOS.SYS file by zeroing it. This only affects DOS and Windows 9x/ME systems.

After that the trojan starts to copy files from \Windows\Command\ folder to \My Documents\, \Windows\, \Windows\System\, \Windows\System\Iosubsys\ and \Windows\Help\ folders. The copied files have zero length. After restart an affected system could become unusable.

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