4 Ways to DNS Enumeration

Today we are going to perform DNS enumeration with Kali Linux platform only. It has an in-built tool for DNS enumeration. For this tutorial, you must be aware of DNS server and its records, if you are not much aware of DNS then read our previous article “Setup DNS Penetration Testing Lab on Windows Server 2012”.

Nmap

The following command will try to discover hosts’ services using the DNS Service Discovery protocol. It sends a multicast DNS-SD query and collects all the responses.

The script first sends a query for _services._dns-sd._udp.local to get a list of services. It then sends a follow-up query for each one to try to get more information.

 From the given screenshot, you can observe the running service on a DNS server.

Following command will try to enumerate DNS hostnames by brute force guessing of common subdomains. With the dns-brute.srv argument, dns-brute will also try to enumerate common DNS SRV records.

Wildcard records are listed as “*A” and “*AAAA” for IPv4 and IPv6 respectively.

 From the screenshot, you can observe DNS hostname

By default, the DNS server performs recursive queries on behalf of its DNS clients and DNS servers that have forwarded DNS client queries to it

Attackers can use recursion to deny the DNS Server service. Therefore, if a DNS server in your network is not intended to receive recursive queries, recursion should be disabled on that server

Following command will Checks if a DNS server allows queries for third-party names. It is expected that recursion will be enabled on your own internal nameservers.

From //technet.microsoft.com

As result, you can observe that recursion is enabled on the targeted system

The following command will enumerate various common service (SRV) records for a given domain name. The service records contain the hostname, port and priority of servers for a given service. The following services are enumerated by the script: – Active Directory Global Catalog – Exchange Autodiscovery – Kerberos KDC Service – Kerberos Passwd Change Service – LDAP Servers – SIP Servers – XMPP S2S – XMPP C2S

DNSEnum

 Multithreaded Perl script to enumerate DNS information of a domain and to discover non-contiguous IP blocks.

OPERATIONS:

  • Get the host’s address (A record).
  • Get the nameservers (threaded).
  • Get the MX record (threaded).
  • Perform axfr queries on nameservers and get BIND VERSION (threaded).
  • Get extra names and subdomains via google scraping (google query = “allinurl: -www site:domain”).
  • Brute force subdomains from a file can also perform recursion on a subdomain that has NS records (all threaded).
  • Calculate C class domain network ranges and perform whois queries on them (threaded).
  • Perform reverse lookups on netranges ( C class or/and whois netranges) (threaded).
  • Write to domain_ips.txt file IP-blocks.

The following command will avoid enumeration of reverse lookup and save the output result into XML format.

DNSRecon

DNSRecon provides the ability to perform:

  1. Check all NS Records for Zone Transfers
  2. Enumerate General DNS Records for a given Domain (MX, SOA, NS, A, AAAA, SPF and TXT)
  3. Perform common SRV Record Enumeration. Top Level Domain (TLD) Expansion
  4. Check for Wildcard Resolution
  5. Brute Force subdomain and host A and AAAA records are given a domain and a wordlist
  6. Perform a PTR Record lookup for a given IP Range or CIDR
  7. Check a DNS Server Cached records for A, AAAA and CNAME Records provided a list of host records in a text file to check
  8. Enumerate Common DNS records in the Local Network Enumerate Hosts and Subdomains using Google

The following command will enumerate DNS record of targeted website

You can observe the result from given below image.

Fierce

Fierce is a reconnaissance tool. Fierce is a PERL script that quickly scans domains (usually in just a few minutes, assuming no network lag) using several tactics.

Type following command for DNS enumeration on the targeted website

From the screenshot, you can see that we have scanned almost the same result as from the above tools.

Author: Aarti Singh is a Researcher and Technical Writer at Hacking Articles an Information Security Consultant Social Media Lover and Gadgets. Contact here

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