<s>
The	O
Zlob	B-Application
Trojan	I-Application
,	O
identified	O
by	O
some	O
antiviruses	O
as	O
Trojan.Zlob	B-Application
,	O
is	O
a	O
Trojan	O
horse	O
which	O
masquerades	O
as	O
a	O
required	O
video	O
codec	O
in	O
the	O
form	O
of	O
ActiveX	B-Application
.	O
</s>
<s>
Once	O
installed	O
,	O
it	O
displays	O
popup	O
ads	O
which	O
appear	O
similar	O
to	O
real	O
Microsoft	B-Application
Windows	I-Application
warning	O
popups	O
,	O
informing	O
the	O
user	O
that	O
their	O
computer	O
is	O
infected	O
with	O
spyware	O
.	O
</s>
<s>
Playing	O
videos	O
on	O
these	O
sites	O
activates	O
a	O
request	O
to	O
download	O
an	O
ActiveX	B-Application
codec	O
which	O
is	O
malware	O
.	O
</s>
<s>
Other	O
variants	O
of	O
Zlob	B-Application
Trojan	I-Application
installation	O
come	O
in	O
the	O
form	O
of	O
a	O
Java	B-Language
cab	O
file	O
masquerading	O
as	O
a	O
computer	O
scan	O
.	O
</s>
<s>
There	O
is	O
evidence	O
that	O
the	O
Zlob	B-Application
Trojan	I-Application
might	O
be	O
a	O
tool	O
of	O
the	O
Russian	O
Business	O
Network	O
or	O
at	O
least	O
of	O
Russian	O
origin	O
.	O
</s>
<s>
The	O
group	O
that	O
created	O
Zlob	B-Application
has	O
also	O
created	O
a	O
Mac	O
Trojan	O
with	O
similar	O
behaviors	O
(	O
named	O
RSPlug	B-Application
)	O
.	O
</s>
<s>
Some	O
variants	O
of	O
the	O
Zlob	B-Application
family	O
,	O
like	O
the	O
so-called	O
"	O
DNSChanger	B-Application
"	O
,	O
add	O
rogue	O
DNS	B-Protocol
name	I-Protocol
servers	O
to	O
the	O
registry	B-Protocol
of	O
Windows-based	O
computers	O
and	O
attempt	O
to	O
hack	O
into	O
any	O
detected	O
router	O
to	O
change	O
the	O
DNS	B-Protocol
settings	O
,	O
potentially	O
re-routing	O
traffic	O
from	O
legitimate	O
web	O
sites	O
to	O
other	O
suspicious	O
web	O
sites	O
.	O
</s>
<s>
DNSChanger	B-Application
in	O
particular	O
gained	O
significant	O
attention	O
when	O
the	O
U.S.	O
FBI	O
announced	O
it	O
had	O
shut	O
down	O
the	O
source	O
of	O
the	O
malware	O
in	O
late	O
November	O
2011	O
.	O
</s>
<s>
However	O
,	O
as	O
there	O
were	O
millions	O
of	O
infected	O
computers	O
which	O
would	O
lose	O
access	O
to	O
the	O
Internet	O
if	O
the	O
malware	O
group	O
's	O
servers	O
were	O
shut	O
down	O
,	O
the	O
FBI	O
opted	O
to	O
convert	O
the	O
servers	O
into	O
legitimate	O
DNS	B-Protocol
servers	O
.	O
</s>
<s>
By	O
the	O
date	O
of	O
the	O
shutdown	O
,	O
there	O
were	O
many	O
free	O
of	O
charge	O
programs	O
available	O
that	O
removed	O
the	O
Zlob	B-Application
malware	O
effectively	O
and	O
without	O
requiring	O
great	O
technical	O
knowledge	O
.	O
</s>
<s>
Current	O
antivirus	O
programs	O
are	O
very	O
effective	O
at	O
detecting	O
and	O
removing	O
Zlob	B-Application
and	O
its	O
time	O
in	O
the	O
wild	O
appears	O
to	O
be	O
coming	O
to	O
an	O
end	O
.	O
</s>
