<s>
Jingwang	B-Application
Weishi	I-Application
(	O
)	O
is	O
a	O
content-control	B-Protocol
mobile	B-Application
app	I-Application
developed	O
by	O
Shanghai	O
Landasoft	O
Data	O
Technology	O
Inc	O
.	O
</s>
<s>
In	O
2018	O
,	O
a	O
research	O
team	O
of	O
analysts	O
conducted	O
a	O
thorough	O
report	O
on	O
Jingwang	B-Application
Weishi	I-Application
.	O
</s>
<s>
The	O
server	O
responds	O
with	O
a	O
JSON	O
object	O
containing	O
a	O
list	O
of	O
MD5	B-Algorithm
hashes	I-Algorithm
,	O
which	O
the	O
program	O
stores	O
in	O
a	O
local	O
SQLite	B-Language
database	O
.	O
</s>
<s>
Jingwang	B-Application
Weishi	I-Application
also	O
performs	O
file	O
scans	O
on	O
the	O
device	O
.	O
</s>
<s>
It	O
looks	O
for	O
files	O
with	O
the	O
extensions	O
3GP	O
,	O
AMR	B-Algorithm
,	O
AVI	O
,	O
WEBM	B-Application
,	O
FLV	B-Operating_System
,	O
IVX	O
,	O
M4A	O
,	O
MP3	B-Application
,	O
MP4	O
,	O
MPG	O
,	O
RMVB	O
,	O
RAM	B-Algorithm
,	O
WMA	B-Application
,	O
WMV	B-Device
,	O
TXT	B-General_Concept
,	O
HTML	B-Language
,	O
CHM	B-Protocol
,	O
PNG	O
,	O
and	O
JPG	O
.	O
</s>
<s>
It	O
then	O
records	O
specific	O
metadata	O
for	O
each	O
file	O
,	O
consisting	O
of	O
each	O
file	O
's	O
name	O
,	O
path	O
,	O
size	O
,	O
MD5	B-Algorithm
hash	I-Algorithm
,	O
and	O
the	O
MD5	B-Algorithm
hash	I-Algorithm
of	O
the	O
MD5	B-Algorithm
hash	I-Algorithm
.	O
</s>
<s>
After	O
the	O
scan	O
,	O
the	O
program	O
compares	O
the	O
files	O
 '	O
MD5	B-Algorithm
hashes	I-Algorithm
with	O
the	O
database	O
of	O
hashes	O
it	O
received	O
from	O
the	O
base	O
server	O
.	O
</s>
<s>
The	O
application	O
uploads	O
device	O
data	O
by	O
compressing	O
two	O
files	O
named	O
jbxx.txt	O
and	O
files.txt	O
into	O
a	O
ZIP	O
file	O
named	O
JWWS.zip	O
.	O
</s>
<s>
The	O
jbxx.txt	O
contains	O
the	O
device	O
's	O
"	O
essential	O
information	O
"	O
.	O
</s>
<s>
The	O
files.txt	O
contains	O
the	O
metadata	O
of	O
the	O
"	O
dangerous	O
"	O
files	O
found	O
on	O
the	O
user	O
's	O
device	O
.	O
</s>
<s>
If	O
no	O
files	O
have	O
been	O
deemed	O
"	O
dangerous	O
"	O
,	O
files.txt	O
will	O
not	O
be	O
sent	O
.	O
</s>
<s>
The	O
application	O
updates	O
itself	O
by	O
downloading	O
newer	O
APKs	B-Application
(	O
Android	O
app	O
files	O
)	O
from	O
another	O
server	O
.	O
</s>
<s>
To	O
download	O
a	O
new	O
version	O
of	O
its	O
APK	B-Application
,	O
the	O
application	O
makes	O
an	O
HTTP	B-Protocol
request	O
to	O
the	O
update	O
server	O
's	O
URL	O
using	O
the	O
syntax	O
http://xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx1/APP/GA_AJ_JK/GA_AJ_JK_GXH.apk?AJLY=650102000000	O
,	O
which	O
performs	O
a	O
download	O
of	O
the	O
APK	B-Application
file	I-Application
.	O
</s>
<s>
The	O
application	O
also	O
makes	O
periodic	O
requests	O
to	O
the	O
base	O
server	O
to	O
update	O
its	O
local	O
database	O
of	O
MD5	B-Algorithm
hashes	I-Algorithm
of	O
"	O
dangerous	O
"	O
files	O
.	O
</s>
<s>
Data	O
is	O
transferred	O
in	O
plaintext	O
and	O
over	O
insecure	O
HTTP	B-Protocol
.	I-Protocol
</s>
<s>
Since	O
the	O
APK	B-Application
file	I-Application
's	O
validity	O
is	O
not	O
verified	O
when	O
updating	O
,	O
a	O
man-in-the-middle	O
attacker	O
could	O
also	O
supply	O
any	O
APK	B-Application
they	O
wanted	O
to	O
the	O
application	O
,	O
which	O
the	O
user	O
would	O
be	O
asked	O
to	O
update	O
to	O
.	O
</s>
