<s>
SevenDust	B-Operating_System
is	O
a	O
computer	O
virus	O
that	O
infects	O
computers	O
running	O
certain	O
versions	O
of	O
the	O
classic	B-Application
Mac	I-Application
OS	I-Application
.	O
</s>
<s>
SevenDust	B-Operating_System
is	O
a	O
polymorphic	O
virus	O
,	O
with	O
some	O
variant	O
also	O
being	O
encrypted	O
.	O
</s>
<s>
Some	O
variants	O
of	O
SevenDust	B-Operating_System
also	O
delete	O
all	O
non-application	O
files	O
accessed	O
during	O
certain	O
times	O
.	O
</s>
