Do you miss AXFR technique? This tool allows to get the subdomains from a HTTPS website in a few seconds.
How it works? CTFR does not use neither dictionary attack nor brute-force, it just abuses of Certificate Transparency logs.
For more information about CT logs, check www.certificate-transparency.org and crt.sh.

Please, follow the instructions below for installing and run CTFR.

Make sure you have installed the following tools:

Python 3.0 or later.
pip3 (sudo apt-get install python3-pip).

$ git clone https://github.com/UnaPibaGeek/ctfr.git
$ cd ctfr
$ pip3 install -r requirements.txt

$ python3 ctfr.py --help

Parameters and examples of use.

-d --domain [target_domain] (required)
-o --output [output_file] (optional)

$ python3 ctfr.py -d starbucks.com

$ python3 ctfr.py -d facebook.com -o /home/shei/subdomains_fb.txt

I think it's a little bit crazy to use Docker for running such a little python script, but if you want to do it anyway, you can use this Docker image.

The instructions are there.

• Sheila A. Berta - (@UnaPibaGeek).