One of the most valuable skills in IT is building custom scrapers—especially for sites that make it tricky. Data is money. So if you can automate data harvesting, and bypass methods which work against this, it’s safe to say this skill is worth the trouble and headaches endured learning how to. Ultimate-Guitar.com is a prime example. If you visit the site, you’ll notice their HTML tags get dynamically obfuscated on every page load via javascript. That means traditional scraping methods break down because the expected markup is scrambled and inconsistent. With that said - there is always a way…
Back in January, I found a broken access control vulnerability which allowed me to repeatedly trick the server into serving me files that normally would be account-walled. I’ve experimented a lot with this and, I can say with certainty - manipulating cookies and ‘echoing’ streamed data (in the form of guitar pro files) is working flawless. I even tried to offer fixes to which I was given no response. Now, over six months later, I’m doubling down with solid, fully automated tools that exploit not only their broken access control but also bypass their anti-bot defenses and obfuscation layers.
What My Scraper Does
The screenshots I’m sharing show my scraper running live, bypassing all security without crossing any legal lines. I’ve built in careful rate limiting so it behaves like a normal user—Ultimate Guitar’s servers can’t distinguish it from human traffic. The scraper systematically crawls every artist from 0-9 and A-Z, logging every song under each artist, and for each song, it extracts genre tags and other metadata. All this structured data is fed into a PostgreSQL database, ready for whatever I want to do downstream.
I achieve this by relying heavily on consistent URL patterns. No matter how much they obfuscate their frontend HTML, the underlying URL structure remains predictable and exploitable. Simply put, Ultimate Guitar is essentially cooked when it comes to my approach.
This scraper runs separately from my updated implementation of the echoHEIST.sh proof-of-concept (which you can find on GitHub.com/drrhnet). However, when combined, they form a highly effective end-to-end system: the scraper discovers and collects all the links, and the echoHEIST.sh script handles downloading the actual Guitar Pro files.
Hypothetically, this means I could batch-download every Guitar Pro tab on the entire site—by artist, by song, or the whole catalog at once. That’s serious power.
