1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
|
local bits = require "bits"
local nmap = require "nmap"
local shortport = require "shortport"
local stdnse = require "stdnse"
local string = require "string"
local table = require "table"
description = [[
Connects to a BackOrifice service and gathers information about
the host and the BackOrifice service itself.
The extracted host information includes basic system setup, list
of running processes, network resources and shares.
Information about the service includes enabled port redirections,
listening console applications and a list of BackOrifice plugins
installed with the service.
]]
---
-- @usage
-- nmap --script backorifice-info <target> --script-args backorifice-info.password=<password>
--
-- @arg backorifice-info.password Encryption password (defaults to no password).
-- @arg backorifice-info.seed Encryption seed (default derived from password, or 31337 for no password).
--
--@output
--31337/udp open|filtered BackOrifice
--| backorifice-info:
--| PING REPLY
--| !PONG!1.20!HAL9000!
--| SYSTEM INFO
--| System info for machine 'HAL9000'
--| Current user: 'Dave'
--| Processor: I586
--| Win32 on Windows 95 v4.10 build 2222 - A
--| Memory: 63M in use: 30% Page file: 1984M free: 1970M
--| C:\ - Fixed Sec/Clust: 64 Byts/Sec: 512, Bytes free: 2147155968/21471
--| ...155968
--| D:\ - CD-ROM
--| PROCESS LIST
--| PID - Executable
--| 4293872589 C:\WINDOWS\SYSTEM\KERNEL32.DLL
--| 4294937581 C:\WINDOWS\SYSTEM\MSGSRV32.EXE
--| 4294935933 C:\WINDOWS\SYSTEM\MPREXE.EXE
--| 4294843869 C:\WINDOWS\SYSTEM\MSTASK.EXE
--| 4294838549 C:\WINDOWS\SYSTEM\ .EXE
--| 4294864917 C:\WINDOWS\EXPLORER.EXE
--| 4294880413 C:\WINDOWS\TASKMON.EXE
--| 4294878445 C:\WINDOWS\SYSTEM\SYSTRAY.EXE
--| 4294771309 C:\WINDOWS\WINIPCFG.EXE
--| 4294772081 C:\WINDOWS\SYSTEM\WINOA386.MOD
--| NETWORK RESOURCES - NET VIEW
--| (null) '(null)' - Microsoft Network - UNKNOWN! (Network root?):CONTAINER
--| (null) 'WORKGROUP' - (null) - DOMAIN:CONTAINER
--| (null) '\\HAL9000' - - SERVER:CONTAINER
--| (null) '\\HAL9000\DOCUMENTS' - sample comment 2 - SHARE:DISK
--| (null) '\\WIN982' - - SERVER:CONTAINER
--| (null) '\\WIN982\BO' - tee hee hee comment - SHARE:DISK
--| SHARELIST
--| 'DOCUMENTS'-C:\WINDOWS\DESKTOP\DOCUMENTS 'sample comment 2' RO:'' RW:'
--| ...'' Disk PERSISTANT READONLY
--| 'IPC$'- 'Remote Inter Process Communication' RO:'' RW:'' IPC FULL
--| REDIRECTED PORTS
--| 0 redirs displayed
--| LISTENING CONSOLE APPLICATIONS
--| 0 apps listed
--| PLUGIN LIST
--|_ End of plugins
--
author = "Gorjan Petrovski"
license = "Same as Nmap--See https://nmap.org/book/man-legal.html"
categories = {"default", "discovery", "safe"}
dependencies = {"backorifice-brute"}
portrule = shortport.port_or_service (31337, "BackOrifice", "udp")
--variables
local g_packet = 0
--"constants"
local MAGICSTRING ="*!*QWTY?"
local TYPE = {
ERROR = 0x00,
PARTIAL_PACKET = 0x80,
CONTINUED_PACKET = 0x40,
PING = 0x01,
SYSINFO = 0x06,
PROCESSLIST = 0x20,
NETVIEW = 0x39,
NETEXPORTLIST = 0x12,
REDIRLIST = 0x0D,
APPLIST = 0x3F,
PLUGINLIST = 0x2F
}
--table of commands which have output
local cmds = {
{cmd_name="PING REPLY",p_code=TYPE.PING,arg1="",arg2="",
filter = function(data)
data = string.gsub(data," ","")
return data
end},
{cmd_name="SYSTEM INFO",p_code=TYPE.SYSINFO,arg1="",arg2="",
filter = function(data)
if string.match(data,"End of system info") then return nil end
return data
end},
{cmd_name="PROCESS LIST",p_code=TYPE.PROCESSLIST,arg1="",arg2="",
filter = function(data)
if string.match(data,"End of processes") then return nil end
data = string.gsub(data,"pid","PID")
return data
end},
{cmd_name="NETWORK RESOURCES - NET VIEW",p_code=TYPE.NETVIEW,arg1="",arg2="",
filter = function(data)
if string.match(data,"Network resources:") then return nil end
if string.match(data,"End of resource list") then return nil end
return data
end},
{cmd_name="SHARELIST",p_code=TYPE.NETEXPORTLIST,arg1="",arg2="",
filter = function(data)
if string.match(data,"Shares as returned by system:") then return nil end
if string.match(data,"End of shares") then return nil end
return data
end},
{cmd_name="REDIRECTED PORTS",p_code=TYPE.REDIRLIST,arg1="",arg2="",
filter = function(data)
if string.match(data,"Redirected ports:%s") then return nil end
return data
end},
{cmd_name="LISTENING CONSOLE APPLICATIONS",p_code=TYPE.APPLIST,arg1="",arg2="",
filter = function(data)
if string.match(data,"Active apps:") then return nil end
return data
end},
-- I !think! plugin list MUST be last because it causes problems server-side
{cmd_name="PLUGIN LIST",p_code=TYPE.PLUGINLIST,arg1="",arg2="",
filter = function(data)
if string.match(data,"Plugins:") then return nil end
return data
end}
}
local function gen_next_seed(seed)
seed = seed*214013 + 2531011
seed = seed & 0xffffff
return seed
end
local function gen_initial_seed(password)
if password == nil then
return 31337
else
local y = #password
local z = 0
for x = 1,y do
local pchar = string.byte(password,x)
z = z + pchar
end
for x=1,y do
local pchar = string.byte(password,x)
if (x-1)%2 == 1 then
z = z - (pchar * (y-(x-1)+1))
else
z = z + (pchar * (y-(x-1)+1))
end
z = z % 0x7fffffff
end
z = (z*y) % 0x7fffffff
return z
end
end
--BOcrypt returns encrypted/decrypted data
local function BOcrypt(data, password, initial_seed )
if data==nil then return end
local output = {}
local seed
if(initial_seed == nil) then
--calculate initial seed
seed = gen_initial_seed(password)
else
--in case initial seed is set by backorifice brute
seed = initial_seed
end
for i = 1, #data do
local data_byte = string.byte(data,i)
--calculate next seed
seed = gen_next_seed(seed)
--calculate encryption key based on seed
local key = bits.arshift(seed,16) & 0xff
local crypto_byte = data_byte ~ key
output[i] = string.char(crypto_byte)
if i == 256 then break end --ARGSIZE limitation
end
return table.concat(output, "")
end
local function BOpack(type_packet, str1, str2)
-- create BO packet
local size = #MAGICSTRING + 4*2 + 3 + #str1 + #str2
local data = MAGICSTRING .. string.pack("<I4 I4 B zz", size, g_packet, type_packet, str1, str2)
g_packet = g_packet + 1
return data
end
local function BOunpack(packet)
local header_format = ("<c%d I4 I4 B"):format(#MAGICSTRING)
if #packet < string.packsize(header_format) then
return nil, TYPE.ERROR
end
local magic, packetsize, packetid, type_packet, pos = string.unpack(header_format, packet)
if magic ~= MAGICSTRING then return nil,TYPE.ERROR end --received non-BO packet
if packetsize ~= #packet then
-- No idea how often this happens or if it should be a fatal error
stdnse.debug1("Wrong packet size: expected %d, got %d bytes", packetsize, #packet)
end
local data = packet:sub(pos)
return data, type_packet
end
local function insert_version_info(host,port,BOversion,BOhostname,initial_seed,password)
if(port.version==nil) then port.version={} end
if(port.version.name==nil) then
port.version.name ="BackOrifice"
port.version.name_confidence = 10
end
if(port.version.product==nil) then port.version.product ="BackOrifice trojan" end
if(port.version.version == nil) then port.version.version = BOversion end
if(port.version.extrainfo == nil) then
if password == nil then
if initial_seed == nil then
port.version.extrainfo = "no password"
else
port.version.extrainfo = "initial encryption seed="..initial_seed
end
else
port.version.extrainfo = "password="..password
end
end
port.version.hostname = BOhostname
if(port.version.ostype == nil) then port.version.ostype = "Windows" end
nmap.set_port_version(host, port)
nmap.set_port_state(host, port, "open")
end
action = function( host, port )
--initial seed is set by backorifice-brute
local initial_seed = stdnse.get_script_args( SCRIPT_NAME .. ".seed" )
local password = stdnse.get_script_args(SCRIPT_NAME .. ".password")
local socket = nmap.new_socket("udp")
local try = nmap.new_try(function() socket:close() end)
socket:set_timeout(5000)
local output_all={}
for i=1,#cmds do
--send command
local data = BOpack( cmds[i].p_code, cmds[i].arg1, cmds[i].arg2 )
data = BOcrypt(data, password, initial_seed)
try(socket:sendto(host, port, data))
--receive info
local output, response, p_type, multi_flag
output = {}
output.name = cmds[i].cmd_name
multi_flag = false
while true do
response = try(socket:receive())
response = BOcrypt(response,password,initial_seed)
response, p_type = BOunpack(response) -- p_type -> error, singular, partial, continued
if p_type ~= TYPE.ERROR then
local tmp_str = cmds[i].filter(response)
if tmp_str ~= nil then
if cmds[i].p_code==TYPE.PING then
--invalid chars for hostname are allowed on old windows boxes
local BOversion, BOhostname = string.match(tmp_str,"!PONG!(1%.20)!(.*)!")
if BOversion==nil then
--in case of bad PING reply return ""
return
else
--fill up version information
insert_version_info(host,port,BOversion,BOhostname,initial_seed,password)
end
end
table.insert(output,tmp_str)
end
--singular
if (p_type & TYPE.PARTIAL_PACKET)==0x00
and (p_type & TYPE.CONTINUED_PACKET)==0x00 then break end
--first
if (p_type & TYPE.CONTINUED_PACKET)==0x00 then
multi_flag = true
end
--last
if (p_type & TYPE.PARTIAL_PACKET)==0x00 then break end
end
end
--gather all responses in table
table.insert(output_all,output)
end
socket:close()
return stdnse.format_output(true,output_all)
end
|