<s>
Ikee	B-Operating_System
was	O
a	O
worm	O
that	O
spread	O
by	O
Secure	B-Protocol
Shell	I-Protocol
connections	I-Protocol
between	O
jailbroken	B-Application
iPhones	B-Device
.	O
</s>
<s>
The	O
code	O
from	O
Ikee	B-Operating_System
was	O
later	O
used	O
to	O
make	O
a	O
more	O
malicious	O
iPhone	B-Device
malware	O
,	O
called	O
Duh	O
.	O
</s>
<s>
iPhone	B-Device
owners	O
of	O
Australia	O
reported	O
that	O
smart	O
phones	O
had	O
been	O
infected	O
by	O
a	O
worm	O
that	O
changed	O
their	O
iPhone	B-Device
wallpaper	O
to	O
Rick	O
Astley	O
,	O
a	O
1980s	O
pop	O
singer	O
.	O
</s>
<s>
It	O
affected	O
smartphones	O
if	O
the	O
owner	O
did	O
not	O
change	O
their	O
default	O
password	O
after	O
installation	O
of	O
SSH	B-Protocol
.	O
</s>
<s>
Once	O
the	O
Ikee	B-Operating_System
worm	O
infected	O
,	O
it	O
would	O
find	O
other	O
iPhones	B-Device
on	O
the	O
mobile	O
network	O
which	O
were	O
vulnerable	O
and	O
infect	O
them	O
as	O
well	O
.	O
</s>
<s>
The	O
worm	O
would	O
n't	O
affect	O
users	O
who	O
had	O
n't	O
jailbroken	B-Application
or	O
installed	O
SSH	B-Protocol
on	O
their	O
iPhone	B-Device
.	O
</s>
<s>
The	O
source	O
code	O
of	O
the	O
ikee	B-Operating_System
worm	O
says	O
it	O
was	O
written	O
by	O
Ikex	O
.	O
</s>
<s>
Two	O
weeks	O
after	O
the	O
release	O
of	O
Ikee	B-Operating_System
,	O
a	O
malicious	O
worm	O
dubbed	O
"	O
Duh	O
"	O
,	O
built	O
off	O
the	O
code	O
of	O
Ikee	B-Operating_System
,	O
was	O
discovered	O
.	O
</s>
<s>
it	O
acted	O
as	O
a	O
Botnet	B-Architecture
,	O
communicating	O
with	O
a	O
command	O
and	O
control	O
center	O
.	O
</s>
