Virus.DOS.AJ or AJ is a virus that runs on MS-DOS.

This virus has 3 versions:

  • Virus.DOS.AJ.390
  • Virus.DOS.AJ.391
  • Virus.DOS.AJ.793


AJ.390 & AJ.391Edit

AJ.390 & AJ.391 is a memory resident parasitic virus. It hooks INT 21h, and writes itself to the end of .EXE files that are executed. The header of infected files contains the word:



AJ.793 is a virus. In February, starting from the 6th, it formats hard drive sectors. It also corrupts the anti-virus databases of ANTI-VIR.DAT and CHKLIST.MS.


No images or videos available.

Ad blocker interference detected!

Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers

Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.