Sudomy – Subdomain Enumeration & Analysis

Sudomy is a subdomain enumeration tool, created using a bash script, to analyze domains and collect subdomains in fast and comprehensive way.


For recent time, Sudomy has these 9 features:
  • Easy, light, fast and powerful. Bash script is available by default in almost all Linux distributions. By using bash script multiprocessing feature, all processors will be utilized optimally.
  • Subdomain enumeration process can be achieved by using active method or passive method
    • Active Method

      • Sudomy utilize Gobuster tools because of its highspeed performance in carrying out DNS Subdomain Bruteforce attack (wildcard support). The wordlist that is used comes from combined SecList (Discover/DNS) lists which contains around 3 million entries
    • Passive Method

      • By selecting the third-party sites, the enumeration process can be optimized. More results will be obtained with less time required. Sudomy can collect data from these well-curated 16 third-party sites:
        Entrust Certificate Search
        https://www.threatcrowd.org https://riddler.io https://findsubdomains.com
  • Test the list of collected subdomains and probe for working http or https servers. This feature uses a third-party tool, httprobe.
  • Subdomain availability test based on Ping Sweep and/or by getting HTTP status code.
  • The ability to detect virtualhost (several subdomains which resolve to single IP Address). Sudomy will resolve the collected subdomains to IP addresses, then classify them if several subdomains resolve to single IP address. This feature will be very useful for the next penetration testing/bug bounty process. For instance, in port scanning, single IP address won’t be scanned repeatedly
  • Performed port scanning from collected subdomains/virtualhosts IP Addresses
  • Testing Subdomain TakeOver attack
  • Taking Screenshotsof subdomains
  • Report output in HTML or CSV format

How Sudomy Works

Sudomy is using cURL library in order to get the HTTP Response Body from third-party sites to then execute the regular expression to get subdomains. This process fully leverages multi processors, more subdomains will be collected with less time consumption.


The following are the results of passive enumeration DNS testing of Sublist3r, Subfinder, and Sudomy. The domain that is used in this comparison is bugcrowd.com.


Asciinema :


Sudomy is currently extended with the following tools. Instructions on how to install & use the application are linked below.

GobusterApache License 2.0not mandatory
httprobeTom Hudson –mandatory
nmapGNU General Public License v2.0not mandatory


$ pip install -r requirements.txt

Sudomy requires jq to run and pars. For more information, Download and install jq here

# Linux
apt-get install jq nmap phantomjs

# Mac
brew cask install phantomjs
brew install jq nmap

If you have a Go environment ready to go, it’s as easy as:

export GOPATH=$HOME/go
export PATH=$PATH:$GOROOT/bin:$GOPATH/bin
go get -u github.com/tomnomnom/httprobe
go get -u github.com/OJ/gobuster

Download Sudomy From Github

# Clone this repository
git clone --recursive https://github.com/screetsec/Sudomy.git

# Go into the repository
sudomy --help

Running in a Docker Container

# Pull an image from DockerHub
docker pull screetsec/sudomy:v1.1.0

# Run an image, you can run the image on custom directory but you must copy/download config sudomy.api on current directory
docker run -v "${PWD}/output:/usr/lib/sudomy/output" -v "${PWD}/sudomy.api:/usr/lib/sudomy/sudomy.api" -it --rm screetsec/sudomy:v1.1.0 [argument]

Post Installation

API Key is needed before querying on third-party sites, such as Shodan, Censys, SecurityTrails, Virustotal, and BinaryEdge.

  • The API key setting can be done in sudomy.api file.
# Shodan
# URL :  http://developer.shodan.io
# Example :
#      - SHODAN_API="VGhpc1M0bXBsZWwKVGhmcGxlbAo"


# Censys
# URL : https://censys.io/register


# Virustotal
# URL : https://www.virustotal.com/gui/

# Binaryedge
# URL : https://app.binaryedge.io/login

# SecurityTrails
# URL : https://securitytrails.com/


 ___         _ _  _
/ __|_  _ __| (_)(_)_ __ _  _
__  || / _  / __   '  || |
|___/_,___,_____/_|_|__, |
                          |__/ v{1.1.0#dev} by @screetsec
Sud⍥my - Fast Subdmain Enumeration and Analyzer

Usage: sud⍥my.sh [-h [--help]] [-s[--source]][-d[--domain=]]

Example: sud⍥my.sh -d example.com
         sud⍥my.sh -s Shodan,VirusTotal -d example.com
         sud⍥my.sh -pS -rS -sC -nT -sS -d example.com

Optional Arguments:
  -a,  --all		 Running all Enumeration, no nmap & gobuster
  -b,  --bruteforce	 Bruteforce Subdomain Using Gobuster (Wordlist: ALL Top SecList DNS)
  -d,  --domain		 domain of the website to scan
  -h,  --help		 show this help message
  -o,  --html		 Make report output into HTML
  -s,  --source		 Use source for Enumerate Subdomain
  -tO, --takeover	 Subdomain TakeOver Vulnerabilty Scanner
  -pS, --ping-sweep	 Check live host using methode Ping Sweep
  -rS, --resolver	 Convert domain lists to resolved IP lists without duplicates
  -sC, --status-code     Get status codes, response from domain list
  -nT, --nmap-top	 Port scanning with top-ports using nmap from domain list
  -sS, --screenshot	 Screenshots a list of website
  -nP, --no-passive	 Do not perform passive subdomain enumeration
       --no-probe	 Do not perform httprobe

To use all 16 Sources and Probe for working http or https servers:

$ sudomy -d hackerone.com

To use one of more source:

$ sudomy -s shodan,dnsdumpster,webarchive -d hackerone.com

To use one or more plugins:

$ sudomy -pS -sC -sS -d hackerone.com

To use all plugins: testing host status, http/https status code, subdomain takeover and screenshots

$ sudomy --all -d hackerone.com

To create report in HTML Format

$ sudomy --all -d hackerone.com --html

HTML Report Sample:


Tools Overview

  • Youtube Videos : Click here

Download Sudomy here – https://github.com/Screetsec/Sudomy

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