Summary

This virus activates on Thursday the 12th, popping up a window with a warning that the next day is Friday the 13th. It pretends to be an anti-virus program, called VirCheck V1.2

The virus avoids infecting programs with names containing the following patterns:

      SCAN     (McAfee's SCAN)
      CLEAN    (McAfee's CLEAN)
      VIR      (Various anti-virus programs)
      ARJ      The ARJ compression program
      FLU      FLUSHOT+ from Ross Greenberg
      COMMAND  COMMAND.COM