"Virus.DOS.2up.6000 or Ugly.6000, is a dangerous memory resident parasitic encrypted stealth virus on DOS."@en . . "2"^^ . . . . . "MS-DOS"@en . "Virus.DOS.2up.6000 or Ugly.6000, is a dangerous memory resident parasitic encrypted stealth virus on DOS."@en . "Assembly"@en . "*DOS executable \n*MZ executable"@en . . "Virus"@en . . "2up"@en . "6000"^^ . . . "*2up\n*Ugly"@en . "1994"^^ . "Ugly"@en .