Threat Level: green Handler on Duty: Didier Stevens

SANS ISC: Enhancing pentesting recon with nmap - SANS Internet Storm Center SANS ISC InfoSec Forums


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Enhancing pentesting recon with nmap

You might have used nmap several times for recon using the conventional portscan functionality (Connect scan, SYN Scan, FIN scan, UDP scan, ...) but for gathering extra info like HTTP directories, DNS host enumeration without performing zone transfer, Microsoft SQL Server enumeration and SMB device info people usually uses additional tools. I will show you how nmap can provide that information without use of extra tools:

1. HTTP Directories

The http-enum script is able to test for the existence of some directories that are common to many webservers and could have potentially interesting information and vulnerabilities. This is an alternative to tools like nikto:

HTTP enumeration with nmap

2. DNS Host Enumeration

Most DNS are correctly configured so they will not allow a zone transfer by default. Instead, the other available way is to query for specific known names common to exposed services like the common names used by Microsoft services. We can use the dnsbrute nmap script, which is a basic alternative to dnsrecon and not supporting all its functionalities:

DNS brute nmap script

3. SMB device info

Windows devices got lots of information that can be gathered from nmap directly:

SMB nmap scan

4. Microsoft SQL Server instances info

You can grab useful information of mysql instances in a server. This is an alternative to SQLRecon or SQLPing:

MySQL scan

What I like about nmap recon scripts is they are fast, reliable and they minimize the load of tools you need to carry on. They will save you tons of time gathering valuable info so you can focus in compromising the assets. If you want to know more about the nmap scripts, please check https://nmap.org/nsedoc.

Manuel Humberto Santander Peláez
SANS Internet Storm Center - Handler
Twitter: @manuelsantander
Web:http://manuel.santander.name
e-mail: msantand at isc dot sans dot org

Manuel Humberto Santander Pelaacuteez

185 Posts
ISC Handler

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