Virus - CIH (1998)

Chernobyl virus also known as CIH was first detected in 1998, however, it first triggered in April 1999, 13th the anniversary of the Chernobyl nuclear disaster (which took place in Ukrainian). 

One of the most harmful viruses, it overwrites critical information on infected system drives. The virus was reportedly the first virus known to have the power to damage computer hardware, with virus attempting to erase the hard drive and overwrite the system's BIOS as well. 

The virus is also known as "space filler virus," due to its ability to clandestinely take up file space on computers and prevent anti-virus software from running. The malicious programme caused widespread damage in several Asian countries paralyzing thousands of computers.