This VPN Lets Anyone Use Your Internet Connection. What Could Go Wrong?

In other posts during the last year, according to the Kela analysis, cybercrime forum users have recommended Big Mama or shared tips about the configurations people should use. In April this year, security company Cisco Talos said it had seen traffic from the Big Mama Proxy, alongside other proxies, being used by attackers trying to brute force their way into a variety of company systems.

Mixed Messages

Big Mama has few details about its ownership or leadership on its website. The company’s terms of service say that a business called BigMama SRL is registered in Romania, although a previous version of its website from 2022, and at least one live page now, lists a legal address for BigMama LLC in Wyoming. The US-based business was dissolved in April and is now listed as inactive, according to the Wyoming Secretary of State’s website.

A person using the name Alex A responded to an email from WIRED about how Big Mama operates. In the email, they say that information about free users’ connections being sold to third parties through the Big Mama Network is “duplicated on the app market and in the application itself several times,” and people have to accept the terms of conditions to use the VPN. They say the Big Mama VPN is officially only available from the Google Play Store.

“We do not advertise and have never advertised our services on the forums you have mentioned,” the email says. They say they were not aware of the April findings from Talos about its network being used as part of a cyberattack. “We do block spam, DDOS, SSH as well as local network etc. We log user activity to cooperate with law enforcement agencies,” the email says.

The Alex A persona asked WIRED to send it more details about the adverts on cybercrime forums, details about the Talos findings, and information about teenagers using Big Mama on Oculus devices, saying they would be “happy” to answer further questions. However, they did not respond to any further emails with additional details about the research findings and questions about their security measures, whether they believe someone was impersonating Big Mama to post on cybercrime forums, the identity of Alex A, or who runs the company.

During its analysis, Trend Micro’s Hilt says that the company also found a security vulnerability within the Big Mama VPN, which could have allowed a proxy user to access someone’s local network if exploited. The company says it reported the flaw to Big Mama, which fixed it within a week, a detail Alex A confirmed.

Ultimately, Hilt says, there are potential risks whenever anyone downloads and uses a free VPN. “All free VPNs come with a trade-off of privacy or security concerns,” he says. That applies to people side-loading them onto their VR headsets. “If you’re downloading applications from the internet that aren’t from the official stores, there’s always the inherent risk that it isn’t what you think it is. And that comes true even with Oculus devices.”