<s>
Win32/Simile	B-Application
(	O
also	O
known	O
as	O
Etap	O
and	O
MetaPHOR	O
)	O
is	O
a	O
metamorphic	O
computer	O
virus	O
written	O
in	O
assembly	B-Language
language	I-Language
for	O
Microsoft	B-Application
Windows	I-Application
.	O
</s>
<s>
It	O
was	O
written	O
by	O
the	O
virus	O
writer	O
"	O
Mental	B-Application
Driller	I-Application
"	O
.	O
</s>
<s>
Files	O
will	O
not	O
be	O
infected	O
if	O
they	O
are	O
located	O
in	O
a	O
subfolder	B-Application
more	O
than	O
three	O
levels	O
deep	O
,	O
or	O
if	O
the	O
folder	B-Application
name	I-Application
begins	O
with	O
the	O
letter	O
W	O
.	O
For	O
each	O
file	O
that	O
is	O
found	O
,	O
there	O
is	O
a	O
50	O
percent	O
chance	O
that	O
it	O
will	O
be	O
ignored	O
.	O
</s>
<s>
The	O
virus	O
contains	O
checks	O
to	O
avoid	O
infecting	O
"	O
goat	O
"	O
or	O
"	O
bait	O
"	O
files	O
(	O
files	O
that	O
are	O
created	O
by	O
anti-virus	B-Application
programs	I-Application
)	O
.	O
</s>
