<s>
Bomber	B-Application
(	O
also	O
known	O
as	O
Commander	O
Bomber	B-Application
)	O
is	O
a	O
DOS	B-Device
polymorphic	O
memory	O
resident	O
computer	O
virus	O
,	O
known	O
for	O
its	O
technique	O
of	O
"	O
patchy	O
infection	O
"	O
.	O
</s>
<s>
This	O
method	O
of	O
infection	O
is	O
very	O
similar	O
to	O
that	O
which	O
is	O
utilised	O
by	O
the	O
OneHalf	B-Application
computer	O
virus	O
.	O
</s>
<s>
Contrary	O
to	O
the	O
usual	O
method	O
of	O
infecting	O
executables	B-Application
(	O
which	O
is	O
to	O
append	O
virus	O
body	O
to	O
the	O
executable	B-Application
and	O
to	O
change	O
the	O
entry	O
point	O
)	O
,	O
it	O
inserts	O
several	O
fragments	O
(	O
"	O
patches	O
"	O
)	O
of	O
its	O
code	O
in	O
random	O
places	O
inside	O
the	O
file	O
.	O
</s>
<s>
The	O
method	O
of	O
infection	O
makes	O
the	O
detection	O
of	O
the	O
virus	O
difficult	O
by	O
anti-virus	B-Application
programs	I-Application
,	O
and	O
it	O
means	O
that	O
they	O
would	O
have	O
to	O
scan	O
the	O
file	O
in	O
its	O
entirety	O
in	O
order	O
to	O
detect	O
the	O
virus	O
.	O
</s>
<s>
The	O
size	O
of	O
the	O
Bomber	B-Application
executable	B-Application
is	O
approximately	O
4096	O
bytes	B-Application
and	O
contains	O
the	O
following	O
text	O
:	O
</s>
