Awesome

shuffleDNS is a wrapper around massdns, written in go, that allows you to enumerate valid subdomains using active bruteforce, as well as resolve subdomains with wildcard handling and easy input-output support.

Based on the work on massdns project by @blechschmidt.

Features

• Simple and modular code base making it easy to contribute.
• Fast And Simple active subdomain scanning.
• Handles wildcard subdomains in a smart manner.
• Optimized for ease of use
• Stdin and stdout support for integrating in workflows

Usage

shuffledns -h

This will display help for the tool. Here are all the switches it supports.

shuffleDNS is a wrapper around massdns written in go that allows you to enumerate valid subdomains using active bruteforce as well as resolve subdomains with wildcard handling and easy input-output support.

Usage:
  ./shuffledns [flags]

Flags:
Flags:
INPUT:
   -d, -domain string[]           Domain to find or resolve subdomains for
   -l, -list string               File containing list of subdomains to resolve
   -w, -wordlist string           File containing words to bruteforce for domain
   -r, -resolver string           File containing list of resolvers for enumeration
   -tr, -trusted-resolver string  File containing list of trusted resolvers
   -ri, -raw-input string         Validate raw full massdns output
   -mode string                   Execution mode (bruteforce, resolve, filter)

RATE-LIMIT:
   -t int  Number of concurrent massdns resolves (default 10000)

UPDATE:
   -up, -update                 update shuffledns to latest version
   -duc, -disable-update-check  disable automatic shuffledns update check

OUTPUT:
   -o, -output string            File to write output to (optional)
   -j, -json                     Make output format as ndjson
   -wo, -wildcard-output string  Dump wildcard ips to output file

CONFIGURATIONS:
   -m, -massdns string         Path to the massdns binary
   -mcmd, -massdns-cmd string  Optional massdns commands to run (example '-i 10')
   -directory string           Temporary directory for enumeration

OPTIMIZATIONS:
   -retries int           Number of retries for dns enumeration (default 5)
   -sw, -strict-wildcard  Perform wildcard check on all found subdomains
   -wt int                Number of concurrent wildcard checks (default 250)

DEBUG:
   -silent         Show only subdomains in output
   -version        Show version of shuffledns
   -v              Show Verbose output
   -nc, -no-color  Don't Use colors in output

Prerequisite

shuffledns requires massdns to be installed in order to perform its operations. You can see the installation instructions at massdns project. If you place the binary in /usr/bin/massdns or /usr/local/bin/massdns, the tool will auto-detect the presence of the binary and use it. On Windows, you need to supply the path to the binary for the tool to work.

The tool also needs a list of valid resolvers. The dnsvalidator project can be used to generate these lists. You also need to provide wordlist, you can use a custom wordlist or use the commonspeak2-wordlist.

Installation Instructions

shuffledns requires go1.21+ to install successfully. Run the following command to install the latest version:

go install -v github.com/projectdiscovery/shuffledns/cmd/shuffledns@latest

Running shuffledns

shuffledns supports two types of operations:

<ins>Subdomain resolving</ins>

To resolve a list of subdomains, you can pass the list of subdomains via the -list option.

shuffledns -d example.com -list example-subdomains.txt -r resolvers.txt -mode resolve

This will run the tool against subdomains in example-subdomains.txt and returns the results. The tool uses the resolvers specified with -r flag to do the resolving.

You can also pass the list of subdomains at standard input (STDIN). This allows for easy integration in automation pipelines.

subfinder -d example.com | shuffledns -d example.com -r resolvers.txt -mode resolve

This uses the subdomains found passively by subfinder and resolves them with shuffledns returning only the unique and valid subdomains.

<ins>Subdomain Bruteforcing</ins>

shuffledns also supports bruteforce of a target with a given wordlist. You can use the w flag to pass a wordlist which will be used to generate permutations that will be resolved using massdns.

shuffledns -d hackerone.com -w wordlist.txt -r resolvers.txt -mode bruteforce

This will run the tool against hackerone.com with the wordlist wordlist.txt. The domain bruteforce can also be done with standard input as in previous example for resolving the subdomains.

echo hackerone.com | shuffledns -w wordlist.txt -r resolvers.txt -mode bruteforce

Handling Wildcards

A special feature of shuffleDNS is its ability to handle multi-level DNS based wildcards, and do it so with a very reduced number of DNS requests. Sometimes all the subdomains would resolve, leading to lots of garbage in the results. The way shuffleDNS handles this is by keeping track of how many subdomains point to an IP, and if the number of subdomains increase beyond a certain small threshold, it checks for wildcard on all the levels of the hosts for that IP iteratively.

Notes

• Wildcard filter feature works with domain (-d) input only.
• Resolving or Brute-forcing only one operation can be done at a time.

License

shuffledns is distributed under GPL v3 License