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Hacker Behind Last Year's 'Collection#1' Data Dump Arrested in Ukraine

According to Ukrainian authorities, a search of the hacker Sanix’s residence revealed he possessed 2TB of stolen data on his computer.

 & Michael Kan Principal Reporter

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Ukrainian authorities say they’ve arrested the hacker behind the “Collection #1” data dump, which grabbed headlines last year for exposing 773 million email addresses. 

The Security Service of Ukraine (SBU) on Tuesday announced it had identified and detained the hacker, who went by the name Sanix. Authorities arrested the suspect after receiving information that Sanix was likely a Ukrainian citizen and based in the country’s Ivano-Frankivsk region. 


Police searching the suspect's home. Police searching the suspect's home. (Credit: SBU)

The hacker gained attention in January 2019 for circulating an 87GB database on the internet that contained 773 million email addresses, along with 21 million unique passwords. Sanix then distributed six other dumps, totaling in 1TB in size, which also contained phone numbers, payment card details, and Social Security numbers.

In the wrong hands, that information could be used to send spam and break into people’s internet accounts. The risk of hijacking was especially high for people who reused the same password across multiple internet accounts.  

Fortunately, much of the data inside the dump was old, and compiled from previously known data breaches, as Sanix later admitted. Still, the hacker claimed to be sitting on many more previously unknown stolen passwords, amounting to a 4TB database he was attempting to sell to other cybercriminals. 


Ukrainian agents looking at the stolen information he had on his computer. Ukrainian agents looking at the stolen information he had on his computer. (Credit: SBU)

However, as security journalist Brian Krebs notes, Sanix was "far from a criminal mastermind," and appears to have left clues pinpointing his real-life identity. 

According to the SBU, a search of Sanix’s residence revealed he possessed 2TB of stolen data on his computer. Other databases he was attempting to sell concerned logins and passwords to email inboxes, PayPal accounts, Bitcoin wallets, and PIN numbers for bank cards. 

The SBU said it confiscated about $10,000 in cash during the search. Allegedly, Sanix was also involved in creating botnets and launching DDoS attacks.

The news is a reminder to secure your internet accounts with strong, unique passwords, and to use two-factor authentication when possible. To help you remember the login credentials, consider a password manager.

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About Our Expert

Michael Kan

Michael Kan

Principal Reporter

My Experience

I've been a journalist for over 15 years. I got my start as a schools and cities reporter in Kansas City and joined PCMag in 2017, where I cover satellite internet services, cybersecurity, PC hardware, and more. I'm currently based in San Francisco, but previously spent over five years in China, covering the country's technology sector.

Since 2020, I've covered the launch and explosive growth of SpaceX's Starlink satellite internet service, writing 600+ stories on availability and feature launches, but also the regulatory battles over the expansion of satellite constellations, fights with rival providers like AST SpaceMobile and Amazon, and the effort to expand into satellite-based mobile service. I've combed through FCC filings for the latest news and driven to remote corners of California to test Starlink's cellular service.

I also cover cyber threats, from ransomware gangs to the emergence of AI-based malware. In 2024 and 2025, the FTC forced Avast to pay consumers $16.5 million for secretly harvesting and selling their personal information to third-party clients, as revealed in my joint investigation with Motherboard.

I also cover the PC graphics card market. Pandemic-era shortages led me to camp out in front of a Best Buy to get an RTX 3000. I'm now following how the AI-driven memory shortage is impacting the entire consumer electronics market. I'm always eager to learn more, so please jump in the comments with feedback and send me tips.

The Best Tech I've Had:

  • My first video game console: a Nintendo Famicom
  • I loved my Sega Saturn despite PlayStation's popularity.
  • The iPod Video I received as a gift in college
  • Xbox 360 FTW
  • The Galaxy Nexus was the first smartphone I was proud to own.
  • The PC desktop I built in 2013, which still works to this day.

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