<s>
Alcon	B-Application
,	O
or	O
RSY	O
(	O
which	O
is	O
more	O
or	O
less	O
as	O
commonly	O
used	O
of	O
a	O
name	O
as	O
Alcon	B-Application
)	O
,	O
is	O
a	O
computer	O
virus	O
that	O
was	O
discovered	O
to	O
be	O
spreading	O
in	O
Europe	O
in	O
1997	O
.	O
</s>
<s>
Alcon	B-Application
is	O
a	O
standard	O
boot	O
sector	O
virus	O
that	O
spreads	O
via	O
floppies	O
.	O
</s>
<s>
Instead	O
of	O
the	O
MBR	B-Device
,	O
it	O
infects	O
the	O
DBR	O
,	O
making	O
some	O
antivirus	O
programs	O
miss	O
it	O
.	O
</s>
<s>
Alcon	B-Application
contains	O
no	O
notable	O
symptoms	O
beyond	O
one	O
extremely	O
damaging	O
one	O
,	O
which	O
is	O
overwriting	O
random	O
information	O
.	O
</s>
<s>
Assuming	O
that	O
the	O
overwrites	O
are	O
subtle	O
,	O
this	O
may	O
result	O
in	O
significant	O
compounding	O
data	O
over	O
time	O
,	O
as	O
Alcon	B-Application
is	O
a	O
slow	O
damager	O
.	O
</s>
<s>
Alcon	B-Application
contains	O
the	O
text	O
"	O
R.SY	O
"	O
.	O
</s>
<s>
Alcon	B-Application
was	O
listed	O
as	O
being	O
spreading	O
by	O
the	O
WildList	O
from	O
April	O
1998	O
to	O
July	O
1999	O
.	O
</s>
<s>
Like	O
most	O
boot	O
viruses	O
,	O
it	O
is	O
near	O
extinct	O
,	O
although	O
it	O
was	O
certainly	O
in	O
the	O
last	O
wave	O
of	O
boot	O
viruses	O
,	O
so	O
cases	O
involving	O
Alcon	B-Application
may	O
be	O
false	O
positives	O
,	O
but	O
may	O
also	O
be	O
due	O
to	O
older	O
,	O
unused	O
infected	O
disks	O
resurfacing	O
.	O
</s>
<s>
Alcon	B-Application
's	O
most	O
common	O
alias	O
is	O
RSY	O
,	O
based	O
on	O
inclusions	O
in	O
the	O
virus	O
code	O
.	O
</s>
<s>
This	O
virus	O
is	O
unrelated	O
to	O
W32/Alcon	O
.	O
</s>
