Junkie

Risk Level 1: Very Low

Updated:
February 13, 2007 11:46:13 AM
Also Known As:
Boot.Malmo
Type:
Virus

Junkie is a virus that infects .com files, the DOS boot sector on floppy disks, and the master boot record (MBR) on the first physical hard disk (drive 80h, drive C). The file form of Junkie does not become memory resident. It simply checks the MBR or floppy-disk boot sector for infection. If the sector is not infected, the virus infects the drive and returns control to the infected host file. The file form of the virus also contains code to target and remove from memory the antivirus TSR (VSafe), which shipped with MS-DOS 6.x. The virus code is two sectors in length and reserves 3 KB of memory. Thus, on a computer with 640 KB of memory, MEM would report 637 KB and CHKDSK would report 652,288 bytes of free memory.

Antivirus Protection Dates

  • Initial Rapid Release version December 20, 2000
  • Latest Rapid Release version July 12, 2008 revision 018
  • Initial Daily Certified version December 20, 2000
  • Latest Daily Certified version September 28, 2010 revision 036
  • Initial Weekly Certified release date pending
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

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