<s>
EternalBlue	O
was	O
among	O
the	O
several	O
exploits	O
used	O
,	O
in	O
conjunction	O
with	O
the	O
DoublePulsar	B-Application
backdoor	I-Application
implant	O
tool	O
,	O
in	O
executing	O
the	O
2017	O
WannaCry	O
attacks	O
.	O
</s>
<s>
EternalBlue	O
exploits	O
a	O
vulnerability	O
in	O
Microsoft	O
's	O
implementation	O
of	O
the	O
Server	B-Operating_System
Message	I-Operating_System
Block	I-Operating_System
(	O
SMB	O
)	O
protocol	O
.	O
</s>
<s>
The	O
vulnerability	O
exists	O
because	O
the	O
SMB	O
version	O
1	O
(	O
SMBv1	O
)	O
server	O
in	O
various	O
versions	O
of	O
Microsoft	B-Application
Windows	I-Application
mishandles	O
specially	O
crafted	O
packets	O
from	O
remote	O
attackers	O
,	O
allowing	O
them	O
to	O
remotely	O
execute	O
code	O
on	O
the	O
target	O
computer	O
.	O
</s>
<s>
On	O
Tuesday	O
,	O
March	O
14	O
,	O
2017	O
,	O
Microsoft	O
issued	O
security	O
bulletin	O
MS17-010	O
,	O
which	O
detailed	O
the	O
flaw	O
and	O
announced	O
that	O
patches	O
had	O
been	O
released	O
for	O
all	O
Windows	O
versions	O
that	O
were	O
currently	O
supported	O
at	O
that	O
time	O
,	O
these	O
being	O
Windows	B-Application
Vista	I-Application
,	O
Windows	B-Device
7	I-Device
,	O
Windows	B-Device
8.1	I-Device
,	O
Windows	B-Operating_System
10	I-Operating_System
,	O
Windows	B-Device
Server	I-Device
2008	I-Device
,	O
Windows	B-Device
Server	I-Device
2012	I-Device
,	O
and	O
Windows	B-Device
Server	I-Device
2016	I-Device
.	O
</s>
<s>
The	O
next	O
day	O
(	O
May	O
13	O
,	O
2017	O
)	O
,	O
Microsoft	O
released	O
emergency	O
security	O
patches	O
for	O
the	O
unsupported	O
Windows	B-Application
XP	I-Application
,	O
Windows	B-Application
8	I-Application
,	O
and	O
Windows	B-Application
Server	I-Application
2003	I-Application
.	O
</s>
<s>
In	O
February	O
2018	O
,	O
EternalBlue	O
was	O
ported	O
to	O
all	O
Windows	B-Application
operating	I-Application
systems	I-Application
since	O
Windows	B-Application
2000	I-Application
by	O
RiskSense	O
security	O
researcher	O
Sean	O
Dillon	O
.	O
</s>
<s>
They	O
were	O
made	O
available	O
as	O
open	B-License
sourced	I-License
Metasploit	B-Application
modules	O
.	O
</s>
<s>
A	O
month	O
after	O
the	O
patch	O
was	O
first	O
released	O
,	O
Microsoft	O
took	O
the	O
rare	O
step	O
of	O
making	O
it	O
available	O
for	O
free	O
to	O
users	O
of	O
all	O
vulnerable	O
Windows	O
editions	O
dating	O
back	O
to	O
Windows	B-Application
XP	I-Application
.	O
</s>
<s>
EternalRocks	O
or	O
MicroBotMassiveNet	O
is	O
a	O
computer	O
worm	O
that	O
infects	O
Microsoft	B-Application
Windows	I-Application
.	O
</s>
<s>
EternalRocks	O
first	O
installs	O
Tor	B-Application
,	O
a	O
private	O
network	O
that	O
conceals	O
Internet	O
activity	O
,	O
to	O
access	O
its	O
hidden	O
servers	O
.	O
</s>
