June 16th

Threat description




Pretoria overwrites the first 879 bytes of infected files with itself, and stores the original 879 bytes at the end of the file. This makes it impossible to fully restore programs shorter than 879 bytes, as their original length is not stored anywhere.

When an infected program is executed, the virus searches the entire current directory for .COM files to infect. As it uses a full-depth recursive directory search, this may take considerable time on an XT-class machine.

On June 16th the execution of an infected file will cause all entries in the root directory to be changed to 'ZAPPED'. June 16th is the day when the Soweto riots first broke out.

The virus uses a simple substitution encryption.


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.

Contact Support

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

Submit a Sample

Suspect a file or URL was wrongly detected? Send it to our Labs for further analysis

Submit a Sample

Give And Get Advice

Give advice. Get advice. Share the knowledge on our free discussion forum.

More Info