<s>
AGI-Plan	B-Application
was	O
a	O
memory	O
resident	O
DOS	B-Device
file	O
infector	O
first	O
isolated	O
at	O
the	O
Agiplan	B-Application
software	O
company	O
in	O
Germany	O
.	O
</s>
<s>
Because	O
of	O
CARO	O
standards	O
that	O
dictate	O
that	O
viruses	O
should	O
not	O
be	O
named	O
after	O
companies	O
,	O
AGI-Plan	B-Application
'	O
s	O
technical	O
name	O
is	O
Month	O
4	O
–	O
6	O
.	O
</s>
<s>
AGI-Plan	B-Application
is	O
related	O
to	O
the	O
Zero	O
Bug	O
virus	O
,	O
as	O
both	O
it	O
and	O
AGI-Plan	B-Application
prepend	O
1,536	O
bytes	B-Application
to	O
files	O
they	O
infect	O
.	O
</s>
<s>
AGI-Plan	B-Application
is	O
not	O
initially	O
damaging	O
until	O
several	O
months	O
after	O
the	O
initial	O
infection	O
,	O
hence	O
its	O
name	O
.	O
</s>
<s>
After	O
activation	O
,	O
AGI-Plan	B-Application
will	O
begin	O
to	O
corrupt	O
write	O
operations	O
,	O
which	O
results	O
in	O
slow	O
,	O
difficult-to-notice	O
damage	O
over	O
time	O
.	O
</s>
<s>
AGI-Plan	B-Application
is	O
notable	O
for	O
reappearing	O
in	O
South	O
Africa	O
in	O
what	O
appeared	O
to	O
be	O
an	O
intentional	O
re-release	O
several	O
years	O
after	O
.	O
</s>
<s>
AGI-Plan	B-Application
never	O
succeeded	O
in	O
spreading	O
significantly	O
beyond	O
the	O
isolated	O
incidents	O
in	O
Germany	O
and	O
South	O
Africa	O
.	O
</s>
