<s>
Graybird	B-Application
is	O
a	O
Trojan	O
horse	O
that	O
hides	O
its	O
presence	O
on	O
compromised	O
computers	O
and	O
downloads	O
files	O
from	O
remote	O
Web	O
sites	O
.	O
</s>
<s>
There	O
are	O
many	O
variations	O
of	O
this	O
virus	O
such	O
as	O
Backdoor.Graybird.P	O
(	O
the	O
most	O
recently	O
discovered	O
variation	O
)	O
.	O
</s>
