OneHalf | |
---|---|
Technical name | OneHalf |
Alias | Slovak Bomber |
Type | DOS |
Subtype | file and boot infector |
Classification | Virus |
Family | OneHalf |
Origin | Slovakia |
OneHalf is a DOS-based polymorphic computer virus (hybrid boot and file infector) discovered in October 1994.[1] It is also known as Slovak Bomber, Freelove or Explosion-II.[2] It infects the master boot record (MBR) of the hard disk, and any files with extensions .COM, .SCR and .EXE.[3] However, it will not infect files that have SCAN, CLEAN, FINDVIRU, GUARD, NOD, VSAFE, MSAV or CHKDSK in the name.[4]
It is also known as one of the first viruses to implement a technique of "patchy infection", introduced in Bomber.
OneHalf has about 20 different variants, all with functionally similar behaviour.[5]