An Illinois man was sentenced Monday to 24 months in federal prison for running websites that allowed paying users to launch powerful distributed denial of service, or DDoS, attacks, according to prosecutors.
The attacks flood targeted computers with information and prevent them from being able to access the internet, officials stated.
U.S. District Court Judge John A. Kronstadt sentenced Matthew Gatrel, 33, of St. Charles, Illinois.
After a nine-day trial in September 2021, a federal jury found Gatrel guilty of one count of conspiracy to commit unauthorized impairment of a protected computer, one count of conspiracy to commit wire fraud, and one count of unauthorized impairment of a protected computer.
“Gatrel ran a criminal enterprise designed around launching hundreds of thousands of cyber-attacks on behalf of hundreds of customers,” prosecutors wrote in a sentencing memorandum. “He also provided infrastructure and resources for other cybercriminals to run their own businesses launching these same kinds of attacks. These attacks victimized wide swaths of American society and compromised computers around the world.”
Gatrel owned and operated two DDoS facilitation websites: DownThem.org and AmpNode.com.
DownThem sold subscriptions allowing customers to launch DDoS attacks while AmpNode provided “bulletproof” server hosting to customers with an emphasis on “spoofing” servers that could be pre-configured with DDoS attack scripts and lists of vulnerable “attack amplifiers” used to launch simultaneous cyberattacks on victims.
Records from the DownThem service revealed more than 2,000 registered users and more than 200,000 launched attacks, including attacks on homes, schools, universities, municipal and local government websites, and financial institutions worldwide. Many AmpNode customers were themselves operating for-profit DDoS services.
Gatrel offered expert advice to customers of both services, providing guidance on the best attack methods to “down” different types of computers, specific hosting providers, or to bypass DDoS protection services.
Gatrel himself often used the DownThem service to demonstrate to prospective customers the power and effectiveness of products, by attacking the customer’s intended victim and providing proof, via screenshot, that he had severed the victim’s internet connection.
Gatrel’s DownThem customers could select from a variety of different paid “subscription plans.”
The subscription plans varied in cost and offered escalating attack capability, allowing customers to select different attack durations and relative attack power, as well as the ability to launch several simultaneous, or “concurrent” attacks.
Once a customer entered the information necessary to launch an attack on their victim, Gatrel’s system was set up to use one or more of his own dedicated attack servers to unlawfully appropriate the resources of hundreds or thousands of other servers connected to the internet in what are called “reflected amplification attacks.”
Co-defendant Juan Martinez, 29, of Pasadena, plead guilty in August 2021 to one count of unauthorized impairment of a protected computer and was sentenced to five years’ probation.
Martinez was one of Gatrel’s customers and became a co-administrator of the site in 2018.
The FBI’s Anchorage Field Office and its Los Angeles-based Cyber Initiative and Resource Fusion Unit investigated this matter, officials stated.
Akamai Technologies, Inc.; Cloudflare, Inc.; DigitalOcean, Inc.; Google, LLC; Palo Alto Networks – Unit 42; University of Cambridge Cyber Crime Centre; and Unit 221B, LLC assisted this investigation.
Assistant U.S. Attorney Cameron L. Schroeder, Chief of the Cyber and Intellectual Property Crime Section, and Assistant United States Attorney Adam Alexander of the District of Alaska are prosecuting this case, according to federal officials.