<s>
Sircam	B-Application
is	O
a	O
computer	O
worm	O
that	O
first	O
propagated	O
in	O
2001	O
by	O
e-mail	O
in	O
Microsoft	B-Application
Windows	I-Application
systems	O
.	O
</s>
<s>
It	O
affected	O
computers	O
running	O
Windows	B-Application
95	I-Application
,	O
Windows	B-Device
98	I-Device
,	O
and	O
Windows	B-Device
Me	I-Device
(	O
Millennium	O
)	O
.	O
</s>
<s>
Sircam	B-Application
was	O
notable	O
during	O
its	O
outbreak	O
for	O
the	O
way	O
it	O
distributed	O
itself	O
.	O
</s>
<s>
Sircam	B-Application
scanned	O
the	O
network	O
for	O
computers	O
with	O
shared	O
drives	O
and	O
copied	O
itself	O
to	O
a	O
machine	O
with	O
an	O
open	O
(	O
non-password	O
protected	O
)	O
drive	O
or	O
directory	O
.	O
</s>
<s>
A	O
simple	O
RPC	B-Operating_System
(	O
Remote	B-Operating_System
Procedure	I-Operating_System
Call	I-Operating_System
)	O
was	O
then	O
executed	O
to	O
start	O
the	O
process	O
on	O
the	O
target	O
machine	O
,	O
usually	O
unknown	O
to	O
the	O
owner	O
of	O
the	O
now-compromised	O
computer	O
.	O
</s>
<s>
Over	O
a	O
year	O
after	O
the	O
initial	O
2001	O
outbreak	O
,	O
Sircam	B-Application
was	O
still	O
in	O
the	O
top	O
10	O
on	O
virus	O
charts	O
.	O
</s>
