local bin = require "bin"
local bit = require "bit"
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 http://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 = bit.band(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 )
local output =""
if data==nil then return end
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
local data_byte
local crypto_byte
for i = 1, #data do
data_byte = string.byte(data,i)
--calculate next seed
seed = gen_next_seed(seed)
--calculate encryption key based on seed
local key = bit.band(bit.arshift(seed,16), 0xff)
crypto_byte = bit.bxor(data_byte,key)
output = bin.pack("AC",output,crypto_byte)
if i == 256 then break end --ARGSIZE limitation
end
return output
end
local function BOpack(type_packet, str1, str2)
-- create BO packet
local data = ""
local size = #MAGICSTRING + 4*2 + 3 + #str1 + #str2
data = bin.pack("A<IICACAC",MAGICSTRING,size,g_packet,type_packet,str1,0x00,str2,0x00)
g_packet = g_packet + 1
return data
end
local function BOunpack(packet)
local pos, magic = bin.unpack("A8",packet)
if magic ~= MAGICSTRING then return nil,TYPE.ERROR end --received non-BO packet
local packetsize, packetid, type_packet, data
pos, packetsize, packetid, type_packet = bin.unpack("<IIC",packet,pos)
pos, data = bin.unpack("A"..(packetsize-pos-1),packet,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.ip, port.number, 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 bit.band(p_type,TYPE.PARTIAL_PACKET)==0x00
and bit.band(p_type,TYPE.CONTINUED_PACKET)==0x00 then break end
--first
if bit.band(p_type,TYPE.CONTINUED_PACKET)==0x00 then
multi_flag = true
end
--last
if bit.band(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
@KyuuKazami