First thing first, we run a quick initial nmap scan to see which ports are open and which services are running on those ports.
target="10.10.10.4"
ports=$(sudo nmap -p- --min-rate=1000 -T4 $target | grep "^[0-9]" | cut -d '/' -f 1 | tr '\\n' ',' | sed s/,$//)
sudo nmap -p$ports -sC -sV $target -vvv
PORT STATE SERVICE REASON VERSION
135/tcp open msrpc syn-ack ttl 127 Microsoft Windows RPC
139/tcp open netbios-ssn syn-ack ttl 127 Microsoft Windows netbios-ssn
445/tcp open microsoft-ds syn-ack ttl 127 Windows XP microsoft-ds
Service Info: OSs: Windows, Windows XP; CPE: cpe:/o:microsoft:windows, cpe:/o:microsoft:windows_xp
Host script results:
| smb-security-mode:
| account_used: guest
| authentication_level: user
| challenge_response: supported
|_ message_signing: disabled (dangerous, but default)
| nbstat: NetBIOS name: LEGACY, NetBIOS user: <unknown>, NetBIOS MAC: 00:50:56:b9:14:44 (VMware)
| Names:
| LEGACY<00> Flags: <unique><active>
| HTB<00> Flags: <group><active>
| LEGACY<20> Flags: <unique><active>
| HTB<1e> Flags: <group><active>
| HTB<1d> Flags: <unique><active>
| \\x01\\x02__MSBROWSE__\\x02<01> Flags: <group><active>
| Statistics:
| 00:50:56:b9:14:44:00:00:00:00:00:00:00:00:00:00:00
| 00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00:00
|_ 00:00:00:00:00:00:00:00:00:00:00:00:00:00
| smb-os-discovery:
| OS: Windows XP (Windows 2000 LAN Manager)
| OS CPE: cpe:/o:microsoft:windows_xp::-
| Computer name: legacy
| NetBIOS computer name: LEGACY\\x00
| Workgroup: HTB\\x00
|_ System time: 2024-05-03T19:33:51+03:00
|_clock-skew: mean: 5d00h27m38s, deviation: 2h07m16s, median: 4d22h57m38s
| p2p-conficker:
| Checking for Conficker.C or higher...
| Check 1 (port 40600/tcp): CLEAN (Couldn't connect)
| Check 2 (port 59028/tcp): CLEAN (Couldn't connect)
| Check 3 (port 50902/udp): CLEAN (Failed to receive data)
| Check 4 (port 38298/udp): CLEAN (Failed to receive data)
|_ 0/4 checks are positive: Host is CLEAN or ports are blocked
|_smb2-security-mode: Couldn't establish a SMBv2 connection.
|_smb2-time: Protocol negotiation failed (SMB2)
We get back the following result showing that these ports are open:
Similarly, we run an nmap scan with the -sU flag enabled to run a UDP scan.
sudo nmap -Pn -sU --open -p- --min-rate 10000 $target
PORT STATE SERVICE
123/udp open ntp
137/udp open netbios-ns
138/udp open|filtered netbios-dgm
445/udp open|filtered microsoft-ds
500/udp open|filtered isakmp
1025/udp open|filtered blackjack
1900/udp open|filtered upnp
4500/udp open|filtered nat-t-ike
Neither smbmap nor smbclient nor netexec show any ability to log in without authentication:
SMB has had its fair share of vulnerabilities in the past, so let’s first run nmap scripts to determine if it is vulnerable.