Summary

Barrotes is a large family of Spanish viruses which infect COM and EXE files when they are executed.

Barrotes.1310 activates on January 5th, at which time it will overwrite the MBR of the first hard disk, and install a display-routine. This routine displays colorized vertical bars on the screen, and a text "Virus BARROTES pro OSoft" in the upper-left corner of the screen. The bars will remain visible on the screen, but the user is allowed to continue using the machine.

Barrotes.1463 attempts to destroy data on the 22nd of every month, but due to an programming error it activates on the 34th of every month - ie. never.

[Analysis: Mikko Hypponen, F-Secure]