The 5KK Streaming UHQ Base Leak Put Millions of Logins Up for Sale

HEROIC analysts identified a combolist called 5KK Streaming UHQ Base uploaded to a Telegram channel on April 2, 2023. The file's name implies roughly 5 million records (KK is common shorthand for millions in combolist naming), but the verified count is 4,759,155 records, each pairing an email address or username with a plaintext password and a URL tied to a streaming service login. Why This Is Dangerous: Picture someone quietly opening a stranger's streaming account, not to watch a show, but to confirm the password still works before trying it on that person's email or banking login next. With 4.76 million plaintext credentials in one file, that scenario can play out at scale, automatically, across millions of accounts in a matter of hours. What Was Exposed: - Email addresses and usernames - Plaintext passwords - URLs tied to streaming account logins Why This Matters: A file this large is a serious credential stuffing resource. Attackers run these lists against streaming, email, and financial sites simultaneously, betting that a meaningful percentage of people reused the same password. Even if you don't care about someone watching your streaming account, the real danger is what else that same password unlocks. How a Combolist Like This Works: A combolist merges login credentials, often gathered from stealer logs or smaller breaches tied to a specific type of service, in this case streaming platforms, into one large tradable file. Files labeled UHQ, meaning ultra high quality, are marketed as pre-checked or cleaned data, which makes them more valuable and more dangerous to the people whose logins appear in them. Check If You Are Affected: With millions of records in circulation, the odds that your information is affected are not trivial. Use HEROIC's free breach scanner to check your email against more than 400 billion leaked records and find out in seconds whether you need to act.