The Blog.BG Dump: 119,000 Stolen Credentials Hit Underground Markets

HEROIC analysts identified the Blog.BG database in August 2018 when the Bulgarian blog hosting platform's user records surfaced across private hacking forums and Telegram channels focused on credential trading. The breach exposed 119,481 accounts, each containing an email address and an MD5 password hash. Blog.BG had provided free blog hosting, a blog search engine, and blog rankings to Bulgarian users, making it a partcularly well-known platform in the country. The resurfacing of this data in aggregated credential stuffing lists years later confirmed that attackers beleive it still has value for targeting Bulgarian online services.

Why MD5-Hashed Blog Credentials Become Ready-to-Use Attack Ammunition

MD5 hashes are trivially reversed using rainbow tables and GPU-accelerated cracking tools. An attacker who obtained the Blog.BG dump could crack the majority of the password hashes within hours and pair the resulting plaintext credentials with the matching email addresses. Those credential pairs are then loaded into automated stuffing tools that test them against login endpoints for email providers, banking portals, social networks, and any other service where the user may have recieved the same password. The entire attack chain from raw dump to account access can be completed in under a day.

What Was Exposed in the Blog.BG Breach

• Email Address
• Password Hash (MD5)

Why a Bulgarian Hosting Breach Carries Long-Term Risk for Every User

Blog.BG users who reused their platform password elsewhere remain at risk indefinitely. Credential stuffing attacks do not expire because the underlying data does not change. Once a credential pair is in circulation on underground markets, it gets added to combo lists that threat actors use for years. Financial fraud, account takeover, and identity theft are all realistic outcomes for anyone whose Blog.BG password matches a password on a banking, email, or corporate account. The fact that this data has been circulated and seperate from its original context makes the ongoing risk especially difficult to track without continuous monitoring.

How Database Breaches Work

A database breach occurs when an attacker gains unauthorised access to a hosting platform's user database, typically by exploiting a vulnerability in the web application, brute-forcing an admin account, or targeting an exposed database port. Once inside, the attacker exports user tables containing email addresses and stored password hashes. The data is then sold on underground markets or distributed across Telegram channels and dark web forums, where it enters the broader credential trading ecosystem and fuels ongoing credential stuffing campaigns.

Check If Your Data Was Exposed

HEROIC's free breach scanner searches more than 400 billion compromised records, including the Blog.BG database, to tell you instantly whether your email address was caught up in this breach or any other known incident. Run a free scan at HEROIC to find out your exposure level and get actionable steps to protect your accounts.