Subjack Save Abandoned

Subdomain Takeover tool written in Go

Project README


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Subjack is a Subdomain Takeover tool written in Go designed to scan a list of subdomains concurrently and identify ones that are able to be hijacked. With Go's speed and efficiency, this tool really stands out when it comes to mass-testing. Always double check the results manually to rule out false positives.

Subjack will also check for subdomains attached to domains that don't exist (NXDOMAIN) and are available to be registered. No need for dig ever again! This is still cross-compatible too.

What's New? (Last Updated 09/17/18)

  • Custom fingerprint support
  • New Services (Re-added Zendesk && Added Readme, Bitly, and more)
  • Slight performance enhancements


Requires Go

go get

How To Use:


  • ./subjack -w subdomains.txt -t 100 -timeout 30 -o results.txt -ssl


  • -d if you want to test a single domain.
  • -w domains.txt is your list of subdomains.
  • -t is the number of threads (Default: 10 threads).
  • -timeout is the seconds to wait before timeout connection (Default: 10 seconds).
  • -o results.txt where to save results to. For JSON: -o results.json
  • -ssl enforces HTTPS requests which may return a different set of results and increase accuracy.
  • -a skips CNAME check and sends requests to every URL. (Recommended)
  • -m flag the presence of a dead record, but valid CNAME entry.
  • -v verbose. Display more information per each request.
  • -c Path to configuration file.

Practical Use

You can use which is kind of a PoC script to mass-locate vulnerable subdomains using results from Rapid7's Project Sonar. This script parses and greps through the dump for desired CNAME records and makes a large list of subdomains to check with subjack if they're vulnerable to Hostile Subdomain Takeover. Of course this isn't the only method to get a large amount of data to test. Please use this responsibly ;)

Adding subjack to your workflow

package main

import (


func main() {
	var fingerprints []subjack.Fingerprints
	config, _ := ioutil.ReadFile("custom_fingerprints.json")
	json.Unmarshal(config, &fingerprints)

	subdomain := ""
	/* Use subjack's advanced detection to identify 
	if the subdomain is able to be taken over. */
	service := subjack.Identify(subdomain, false, false, 10, fingerprints)

	if service != "" {
		service = strings.ToLower(service)
		fmt.Printf("%s is pointing to a vulnerable %s service.\n", subdomain, service)

See the godoc for more functions.


Q: What should my wordlist look like?

A: Your wordlist should include a list of subdomains you're checking and should look something like:


Extra information about Hostile Subdomain Takeovers:

Open Source Agenda is not affiliated with "Subjack" Project. README Source: haccer/subjack
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