Inside the FBI's Push to Disrupt Hackers Before They Strike with Brett Leatherman

In this episode of Cyber Focus, Frank Cilluffo sits down with Brett Leatherman, Assistant Director for Cyber at the FBI, for a wide-ranging conversation about how the Bureau is using law enforcement authorities, intelligence, partnerships, and court-authorized technical operations to disrupt adversaries, help victims, and defend U.S. critical infrastructure. Leatherman explains why the FBI expects to conduct more operations like Operation Masquerade, which evicted Russian GRU actors from compromised routers, and why privately owned routers, edge devices, and small networks can become valuable infrastructure for foreign intelligence services and criminal groups. He also discusses the rise of agentic AI in ransomware, China-linked threats to operational technology and critical infrastructure, Operation Winter SHIELD, supply-chain risk, and why early victim reporting can help the FBI move upstream against cyber adversaries. Main Topics Covered FBI cyber threat response and disruption operations Operation Masquerade and court-authorized cyber actions Ransomware, agentic AI, and emerging threats China-linked threats to critical infrastructure Public-private partnerships and victim reporting Operation Winter SHIELD and cyber defense best practices Key Quotes "Deterrence for us is not just about arrests, indictments, convictions, although that still matters a lot to what we do. It's also about removing capacity and capability from the actors where they're not touchable. Their infrastructure is touchable, their money is touchable, their tools are touchable." — Brett Leatherman "The idea of security through obscurity is dangerous." — Brett Leatherman "The FBI will never ask you to maintain breach while we are conducting evidence collection." — Brett Leatherman "Ransomware actors are starting to leverage agentic AI, along with the nation states, to really move across the cyber kill chain at speeds we haven't seen before, and at speeds defenders might not be ready for."  — Brett Leatherman "We can't defend against machine speed at human speed." — Brett Leatherman  Relevant Links and Resources FBI Cyber Division Internet Crime Complaint Center (IC3) Operation Masquerade Operation Winter SHIELD Guest Bio Brett Leatherman is the Assistant Director for Cyber at the FBI, where he oversees the Bureau's cyber efforts, including incident response, threat response, and cyber disruption operations. A 23-year FBI agent, Leatherman has worked or managed programs across counterterrorism, counterintelligence, cyber, and criminal investigations. He previously served in senior roles in the FBI's Cyber Division and in Dallas, and has also served as an FBI pilot and negotiator.