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  1. Everything
  2. Everything Web

Sub Domain Enumeration

Last updated 2 years ago

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Google Dorking

Google dorks can be used to enumerate host subdomains. For example searching for Microsoft.com subdomains we can use the minus - symbol to tell Google to remove URL results for particular strings.

Every time a sub domain is found it can then be excluded from the next search

microsoft.com -www -docs -infrastructuremap

Tools

Amass

amass enum -d <domain>

DNSRecon

# Quick brute force
dnsrecon -t brt -v -d <Domain>

# With Wordlist
dnsrecon -t brt -D <Wordlist> -v -d <Domain>

Sublist3r

# Default Search
sublist3r -d <Domain> -v

# With brute force

Wfuzz

wfuzz -c -f sub-fighter -w /usr/share/seclists/Discovery/DNS/subdomains-top1million-5000.txt -u "http://love.htb" -H "Host: FUZZ.love.htb" --hl 125

Web Tools

Cert.sh

Searching a domain name in Cert.sh can help identify when SSL Certificates have been issued to a particular domain and subdomains.

DNSdumpster

VirusTotal

https://www.virustotal.com/gui/domain/<Domain>/relations

Virtual Hosts

Some subdomains aren't always hosted in publicly accessible DNS results, such as development versions of a web application or administration portals.

Web servers can host multiple websites under the same IP. The web server is able to differentiate between requests by the value in the Host header of a request. It is possible to take advantage of this by fuzzing the host header for discovery.

Fuff

ffuf -w <Wordlist> -H "Host: FUZZ.acmeitsupport.thm" -u <IP>

is a great tool for DNS and host enumeration. We even get a nice downloadable graph and can even export discovered hosts directly to .xlsx.

VirusTotal can be used to look up sub domains of a host:

DNSdumpster
https://www.virustotal.com/gui/home/search
crt.sh | Certificate Search
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