Enumerate all the subdomains for a domain name

83 pointsposted 10 months ago
by Eikon
(merklemap.com)

24 Comments

Kab1r

10 months ago

Is this just searching certificate transparency logs?

flemhans

10 months ago

I think it's a mix of different sources. Certainly, some of my subdomains there never had an SSL certificate.

remram

10 months ago

I have subdomains with (non-wildcard) certificates that aren't on there.

yup_sto

10 months ago

Have you considered adding a monitoring feature where a user can enter a domain to be monitored and then be notified if a "similar" domain comes across the ingestion pipeline.

This would be useful for early detection of potential impersonations/typo-squatting domains typically used for phishing/scams.

Something as simple as a configurable levenshtein distance/jaro-winkler similarity check across CN and SAN of all new certs maybe? (user can configure with threshold to control how "noisy" they want their feed).

Eikon

10 months ago

For sure, it was on my todo list :)

yup_sto

10 months ago

Awesome, I will keep my eye on this for sure, I've spent the past few months tinkering with ingesting CT logs for bug bounty automation.

Curious if you're running your own CertStream server, or just continuously polling known CT logs with your own implementation.

yup_sto

10 months ago

I also noticed you are ingesting/storing flowers-to-the-world.com certs, not sure what stage of optimization you are at but blacklisting/ignoring these certs in my ingestion pipeline helped with avoiding storing unnecessary data

I'm not sure but I believe that's used by Google internally for testing purposes.

For example if you search google, it returns 120k+ results, and these useless results are at the front.

Eikon

10 months ago

> I also noticed you are ingesting/storing flowers-to-the-world.com certs, not sure what stage of optimization you are at but blacklisting/ignoring these certs in my ingestion pipeline helped with avoiding storing unnecessary data

The goal is to have something exhaustive so I'll keep them. But you are right that I probably should not put them at front. Not sure how important it is though as these results shouldn't match many queries.

yup_sto

10 months ago

Exhaustive/Robust is the way for sure.

Minimizing storage was a priority for me since it's just a small side-project/automation.

I've looked for information on what the hell the `flowers-to-the-world` entries are that pop and have found nothing, curious what's going on there.

Eikon

10 months ago

I am not using certstream as we'd lose data on the first network error. The way it's designed is more "Rsync for ct logs" than something like a stream => storage system.

Btw, you can get our feed like that:

    curl -N 'https://api.merklemap.com/live-domains?no_throttle=true'

veb

10 months ago

How strange. I just tried this out and I see two unauthorised subdomains, with one being an actual "spam" website. However, I don't even know how to delete a subdomain that doesn't show up in my domain registrar or cloudflare!

Thanks for the tool.

roninorder

10 months ago

Found only 43 subdomains for *.wordpress.com.