<s>
Yahoo	B-Application
Assistant	I-Application
,	O
formerly	O
named	O
3721	B-Application
Internet	I-Application
Assistant	I-Application
,	O
is	O
a	O
Browser	B-Application
Helper	I-Application
Object	I-Application
for	O
Internet	B-Application
Explorer	I-Application
developed	O
by	O
Beijing	O
3721	B-Application
Technology	O
Co	O
.	O
Ltd	O
,	O
and	O
was	O
renamed	O
to	O
Yahoo	B-Application
Assistant	I-Application
after	O
Beijing	O
3721	B-Application
Technology	O
was	O
acquired	O
by	O
Yahoo	B-Application
.	O
</s>
<s>
3721	B-Application
Internet	I-Application
Assistant	I-Application
,	O
together	O
with	O
3721	B-Application
Chinese	O
Keywords	O
,	O
are	O
known	O
as	O
Spyware	O
by	O
Microsoft	O
AntiSpyware	O
,	O
and	O
malware	O
or	O
browser	O
hijacker	O
by	O
some	O
others	O
,	O
such	O
as	O
Panda	O
Antivirus	O
.	O
</s>
<s>
However	O
,	O
Yahoo	B-Application
China	O
filed	O
a	O
lawsuit	O
against	O
Beijing	O
Sanjiwuxian	O
Internet	O
Technology	O
Co	O
.	O
Ltd	O
,	O
the	O
developer	O
of	O
the	O
360Safe	O
antispyware	O
for	O
identifying	O
Yahoo	B-Application
Assistant	I-Application
as	O
malware	O
in	O
360Safe	O
.	O
</s>
<s>
3721	B-Application
Internet	I-Application
Assistant	I-Application
was	O
originally	O
released	O
as	O
a	O
normal	O
client-server	O
application	O
.	O
</s>
<s>
However	O
,	O
it	O
turned	O
to	O
use	O
ActiveX	B-Application
technology	O
to	O
install	O
itself	O
on	O
a	O
client	O
system	O
later	O
and	O
was	O
also	O
shipped	O
with	O
many	O
sharewares	O
as	O
default	O
install	O
options	O
.	O
</s>
<s>
3721	B-Application
Internet	I-Application
Assistant	I-Application
was	O
also	O
blamed	O
for	O
its	O
use	O
of	O
a	O
flaw	O
in	O
Microsoft	B-Application
Internet	I-Application
Explorer	I-Application
to	O
install	O
itself	O
automatically	O
when	O
a	O
user	O
is	O
browsing	O
an	O
array	O
of	O
3721	B-Application
sponsored	O
personal	O
and	O
commercial	O
websites	O
with	O
Microsoft	B-Application
Internet	I-Application
Explorer	I-Application
.	O
</s>
<s>
Yahoo	B-Application
!	O
</s>
<s>
Assistant	O
is	O
also	O
included	O
in	O
3721	B-Application
Chinese	O
Keywords	O
and	O
Yahoo	B-Application
!	O
</s>
<s>
Mail	O
Express	O
,	O
but	O
sometimes	O
the	O
whole	O
package	O
of	O
Internet	O
Assistant	O
,	O
Chinese	O
Keywords	O
and	O
Mail	O
Express	O
is	O
named	O
"	O
Yahoo	B-Application
Assistant	I-Application
"	O
in	O
some	O
sharewares	O
.	O
</s>
<s>
The	O
company	O
says	O
the	O
automatic	O
installation	O
ended	O
in	O
September	O
2005	O
and	O
now	O
asks	O
user	O
's	O
permission	O
before	O
installing	O
,	O
however	O
,	O
CA	O
Inc	O
.	O
reported	O
that	O
during	O
Yahoo	B-Application
!	O
</s>
<s>
3721	B-Application
claims	O
3721	B-Application
Internet	I-Application
Assistant	I-Application
includes	O
many	O
useful	O
features	O
,	O
such	O
as	O
IE	O
setting	O
repair	O
,	O
security	O
shield	O
,	O
removal	O
of	O
internet	O
history	O
information	O
and	O
blocking	O
ads	O
.	O
</s>
<s>
Some	O
users	O
also	O
reported	O
that	O
Internet	O
Assistant	O
buttons	O
reappeared	O
immediately	O
after	O
their	O
manual	O
removal	O
using	O
Internet	B-Application
Explorer	I-Application
customization	O
features	O
,	O
and	O
Blue	O
Screen	O
of	O
Death	O
appeared	O
when	O
using	O
Internet	O
Assistant	O
.	O
</s>
<s>
3721	B-Application
Internet	I-Application
Assistant	I-Application
will	O
enable/disable	O
other	O
Internet	B-Application
Explorer	I-Application
extensions	O
,	O
except	O
the	O
advertisement	O
links	O
and	O
extensions	O
installed	O
by	O
Yahoo	B-Application
products	O
.	O
</s>
<s>
3721	B-Application
Internet	I-Application
Assistant	I-Application
runs	O
under	O
multiple	O
rundll32.exe	O
processes	O
.	O
</s>
<s>
A	O
driver	B-Application
named	O
CnsMinKP.sys	O
is	O
installed	O
with	O
3721	B-Application
Internet	I-Application
Assistant	I-Application
,	O
along	O
with	O
several	O
hidden	O
Windows	O
services	O
.	O
</s>
<s>
After	O
uninstallation	O
,	O
several	O
files	O
are	O
left	O
on	O
the	O
system	O
,	O
but	O
they	O
are	O
not	O
visible	O
in	O
Windows	B-Protocol
Explorer	I-Protocol
.	O
</s>
<s>
They	O
can	O
be	O
found	O
by	O
using	O
tools	O
such	O
as	O
Total	B-Language
Commander	I-Language
or	O
in	O
the	O
DOS	O
box	O
.	O
</s>
<s>
Yahoo	B-Application
Assistant	I-Application
also	O
removes	O
360Safe	O
,	O
an	O
antispyware	O
program	O
of	O
a	O
competitor	O
,	O
without	O
notifying	O
the	O
user	O
.	O
</s>
<s>
3721	B-Application
Internet	I-Application
Assistant	I-Application
,	O
together	O
with	O
3721	B-Application
Chinese	O
Keywords	O
,	O
according	O
to	O
Interfax	O
,	O
are	O
regarded	O
by	O
Chinese	O
internet	O
users	O
as	O
"	O
Hooligan	O
"	O
or	O
"	O
Zombie	O
"	O
applications	O
.	O
</s>
<s>
The	O
uninstall	O
program	O
of	O
the	O
pair	O
provided	O
by	O
3721	B-Application
simply	O
redirects	O
users	O
to	O
the	O
3721	B-Application
website	O
(	O
in	O
Simplified	O
Chinese	O
thus	O
not	O
recognizable	O
except	O
by	O
Chinese	O
speakers	O
)	O
,	O
and	O
the	O
default	O
option	O
of	O
the	O
web	O
page	O
is	O
to	O
keep	O
3721	B-Application
Internet	I-Application
Assistant	I-Application
after	O
the	O
uninstallation	O
.	O
</s>
<s>
After	O
following	O
the	O
web	O
uninstallation	O
wizard	O
and	O
a	O
reboot	O
,	O
many	O
3721	B-Application
files	O
will	O
still	O
remain	O
on	O
the	O
client	O
system	O
.	O
</s>
