This is a dangerous memory resident parasitic virus. It hooks INT 21h and writes itself to the end of COM and EXE files (except AIDSTEST.EXE) that are executed. On December, 27th it erases the hard drive sectors. It also hooks INT 17h (printer) and sometimes prints rude messages in Russian.
The virus contains the text string:
SNAIDSTESTCOMEXE
HS86.2 Ver 4.06.Copyright by EA computers inc.1994