When every day is Friday the 13th

日期:2019-03-07 03:20:06 作者:管嫩 阅读:

By Barry Fox IF YOU think you’ve beaten the millennium bug by checking that all the software you’ve loaded onto your computer is Y2K compliant, beware. If you’re unknowingly infected with a date-activated virus, it could wreak its own brand of millennium havoc. This warning comes from the Spanish anti-virus software company Panda. Its staff have run Y2K checks on some of the 44 000 viruses in circulation, and have found that the millennium bug could make many even more troublesome. The Friday the 13th virus, for instance, lies dormant until the 13th day of any month falls on a Friday. It then destroys the boot sector of the hard disc, so that a PC won’t start until the operating system is reinstalled. The computer then works properly until Friday the 13th comes round again. These viruses rely on a division formula based on the number of days that have passed since 1 January 1980, the starting date for most computer calendars. When the clock in a Y2K-compliant PC reaches 1 January 2000, and changes its calendar, the virus formula no longer works and can keep triggering every day. If the PC is not compliant and defaults to 1980, the virus may trigger at dates that aren’t a Friday the 13th. “Compliancy is unlikely to be a virus writer’s first priority,” says Panda’s technical director,