OneHalf

For the fraction, see One half.
OneHalf
Technical nameOneHalf
AliasSlovak Bomber
TypeDOS
Subtypefile and boot infector
ClassificationVirus
FamilyOneHalf
OriginSlovakia
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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]

  1. ^ "One Half Virus". VSUM. Retrieved 13 February 2013.
  2. ^ "One_Half Description - F-Secure Labs". www.f-secure.com.
  3. ^ "One-half virus". Proland Software. Retrieved 13 February 2013.
  4. ^ "Onehalf - The Virus Encyclopedia". virus.wikidot.com.
  5. ^ "One Half". ESET. Retrieved 13 February 2013.