You're reading from Nmap Network Exploration and Security Auditing Cookbook, Third Edition Network discovery and security scanning at your fingertips

Product type Paperback

Published in Sep 2021

Publisher Packt

ISBN-13 9781838649357

Length 436 pages

Edition 3rd Edition

Languages

C++

Tools

Nmap

Concepts

Network Security

Author (1):

Paulino Calderon

View More author details

Table of Contents (22) Chapters

Preface

1. Chapter 1: Nmap Fundamentals

2. Chapter 2: Getting Familiar with Nmap's Family FREE CHAPTER

3. Chapter 3: Network Scanning

4. Chapter 4: Reconnaissance Tasks

5. Chapter 5: Scanning Web Servers

6. Chapter 6: Scanning Databases

7. Chapter 7: Scanning Mail Servers

8. Chapter 8: Scanning Windows Systems

9. Chapter 9: Scanning ICS/SCADA Systems

10. Chapter 10: Scanning Mainframes

11. Chapter 11: Optimizing Scans

12. Chapter 12: Generating Scan Reports

13. Chapter 13: Writing Your Own NSE Scripts

14. Chapter 14: Exploiting Vulnerabilities with the Nmap Scripting Engine

15. Other Books You May Enjoy

Appendix A: HTTP, HTTP Pipelining, and Web Crawling Configuration Options

HTTP user agent

1. Appendix Β: Brute-Force Password Auditing Options

Brute modes

2. Appendix C: NSE Debugging

3. Appendix D: Additional Output Options

4. Appendix Ε: Introduction to Lua

5. Appendix F: References and Additional Reading

Why subscribe?

Retrieving information from SMTP servers with NTLM authentication

SMTP servers with Windows NT LAN Manager (NTLM) authentication disclose NetBIOS, DNS, and OS build version information. This is excellent information to fingerprint a system accurately prior to authentication.

This recipe shows how to use Nmap to extract information from SMTP servers with NTLM authentication enabled.

How to do it...

To retrieve information from an SMTP server with NTLM, run the following command:

$ nmap -p25,465,587 --script smtp-ntlm-info --script-args smtp-ntlm- info.domain=<target domain> <target>

The results will include NetBIOS, DNS, and OS build version information in the script output section:

25/tcp   open  smtp
| smtp-ntlm-info:
|    Target_Name: SMTP
|    NetBIOS_Domain_Name: SMTP
|    NetBIOS_Computer_Name: SMTP
|    DNS_Domain_Name: 0xdeadbeefcafe.com
| ...