OneHalf

OneHalf is a DOS-based polymorphic computer virus (hybrid boot and file infector) discovered in October 1994. It is also known as Slovak Bomber, Freelove or Explosion-II. It infects the master boot record (MBR) of the hard disk, and any files with extensions .COM, .SCR and .EXE. However, it will not infect files that have SCAN, CLEAN, FINDVIRU, GUARD, NOD, VSAFE, MSAV or CHKDSK in the name.

OneHalf
Common nameOneHalf
Technical nameOneHalf
AliasesSlovak Bomber
FamilyOneHalf
ClassificationVirus
TypeDOS
Subtypefile and boot infector
Isolation1994
Point of isolationunknown
Point of originSlovakia

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.

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