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API Reference: MS17-010 (EternalBlue) Detection
CVE-2017-0144 — EternalBlue
Affected Systems
- Windows XP, Vista, 7, 8, 8.1, 10 (pre-patch)
- Windows Server 2003, 2008, 2008 R2, 2012, 2016 (pre-patch)
Protocol: SMBv1 (Port 445)
Nmap NSE Script
Check for MS17-010
nmap -p 445 --script smb-vuln-ms17-010 <target>
Output (Vulnerable)
PORT STATE SERVICE
445/tcp open microsoft-ds
| smb-vuln-ms17-010:
| VULNERABLE:
| Remote Code Execution vulnerability in Microsoft SMBv1 servers
| Risk factor: HIGH CVSSv2: 9.3
SMB Protocol Basics
Negotiate Protocol Request
| Offset | Size | Field |
|---|---|---|
| 0 | 4 | NetBIOS Session header |
| 4 | 4 | SMB magic (0xFF534D42) |
| 8 | 1 | Command (0x72 = Negotiate) |
| 9 | 4 | Status |
| 13 | 1 | Flags |
SMB Versions
| Version | Protocol | Notes |
|---|---|---|
| SMBv1 | NT LM 0.12 | Vulnerable to EternalBlue |
| SMBv2 | SMB 2.002 | Not vulnerable |
| SMBv3 | SMB 3.0 | Not vulnerable |
Python Socket Check
SMBv1 Connection Test
import socket
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.settimeout(5)
sock.connect((target, 445))
sock.send(SMB_NEGOTIATE_PACKET)
response = sock.recv(4096)
Metasploit Module (Authorized Testing)
Scanner
use auxiliary/scanner/smb/smb_ms17_010
set RHOSTS <target>
run
Detection Events
| Source | Indicator |
|---|---|
| Windows Event 7036 | Service state change |
| Sysmon Event 3 | Network connection to 445 |
| IDS | Signature for EternalBlue SMB exploit |
Remediation
- Apply MS17-010 patch (KB4012598 / KB4013389)
- Disable SMBv1:
Set-SmbServerConfiguration -EnableSMB1Protocol $false - Block port 445 at network perimeter
- Enable Windows Firewall rules for SMB
Suricata Detection Rule
alert tcp any any -> $HOME_NET 445 (msg:"ET EXPLOIT EternalBlue Attempt";
flow:established,to_server; content:"|ff|SMB|73|";
content:"|08 00|"; within:2; distance:54; sid:2024217;)