Zero Bug

Threat description

Details

CATEGORYMalware
TYPEVirus
OTHERResident, COM-files

Summary

The "Zero Bug" will mark infected files in the same way as the Vienna virus, placing 62 in the "seconds" field of the timestamp of the .COM files it infects. Apart from this, the viruses are very dissimilar.

This virus will search for COMMAND.COM, using the value of the COMSPEC environment variable to locate the file. Then it will remain resident, hook INT 60 and infect every .COM file run. After some time has passed, a "smiley" (ASCII 1) will appear on the screen and "eat" any zero it finds on the screen.

The virus seems not too well written - containing some unreachable code, but it is unusual in some ways.

If the virus is active in memory and you look at a directory containing infected files, the virus will make the directory entries appear as they were before the infection. That is, you will not see any increase in file length.



Removal

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