joohoi
Joona is a seasoned hacker with over two decades of experience in the fields of software development and information security. He is recognized for his significant contributions to the open-source community, notably his work on acme-dns, ffuf, and certbot.
During days he works to secure hundreds of applications as the Head of Security Testing at Visma
Session
Did you know that if you change a single bit from 1 to 0 (or vice versa) in the first 'g' of the domain name google.com (which is 01100111 in binary) you will end up with variety of valid "bitflip" domains like coogle.com, oogle.com, & woogle.com
So what happens if you generate and register a bunch of cheap bitfliped versions of popular cloud / Saas provider domains, point them to your VPS, log all incoming requests & then forget about the whole thing for two years?
Well you will in fact receive a stiff bill, generate huge log files and eventually run out of disk space. But on the upside, you will also have collected a treasure trove of legit credentials & interesting stuff like valid OAuth refresh tokens, JWT tokens, bearers, cookies, emails, meeting invites with passwords & truckloads of internet scanner noise.
In this session we will revisit bitflip research from the last decade and weponize it. Showcase 'Certainly' a pioneering offensive / defensive tool that employs Wildcard DNS matching & on-the-fly generated SSL certificates and custom payloads for incoming requests across various protocols. All with the intention to downgrade security, harvest credentials, capture emails and replacing dependencies with custom "malicious" payloads