On Monday, a hacking group calling itself the “ShadowBrokers” announced an auction for what it claimed were “cyber weapons” made by the NSA. Based on never-before-published documents provided by the whistleblower Edward Snowden, The Intercept can confirm that the arsenal contains authentic NSA software, part of a powerful constellation of tools used to covertly infect computers worldwide.

The provenance of the code has been a matter of heated debate this week among cybersecurity experts, and while it remains unclear how the software leaked, one thing is now beyond speculation: The malware is covered with the NSA’s virtual fingerprints and clearly originates from the agency.

Source: The NSA Leak Is Real, Snowden Documents Confirm