Loz.2968 is a dangerous memory resident encrypted parasitic viruses. Some of them use the polymorphic technology. They hook INT 21h and write themselves to the end of COM and EXE files that are accessed (the earlier versions infect COM files only). These viruses alter the first 4 bytes of COM files (JMP Loc_Virus, DB ' '). While creating a resident copy they decrease the value of system memory (the word at 0000:0413).
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Virus.DOS.Loz or Loz are memory resident encrypted parasitic viruses that run on MS-DOS. Some of...