Silent Ransom Group Intensifies Law Firm Targeting with Vishing Attacks

Published
Score
7

Why it matters

The Silent Ransom Group, a cybercriminal organization active since 2022, has intensified attacks on U.S. law firms using social engineering tactics that bypass traditional security defenses. The group has shifted from callback phishing emails to direct vishing calls impersonating IT staff, tricking employees into installing remote access tools. Once inside a network, attackers use legitimate software like WinSCP and Rclone to exfiltrate client data, then demand ransom payments under threat of publishing stolen information on dark web leak sites. The FBI's Cyber Division has tracked the group under multiple aliases—Luna Moth, Chatty Spider, and UNC3753—and confirmed breaches at major firms including Jones Day and Orrick, Herrington & Sutcliffe LLP, where attackers maintained network access for approximately one week beginning January 20, 2026.

The group's tactical evolution continues to accelerate. By March 2025, the FBI observed a shift from callback phishing to direct vishing calls. By April 2025, attackers began physically visiting office locations to insert storage devices for data theft. The attacks rely entirely on social engineering and legitimate remote access solutions, deploying no malware, which makes detection through conventional security tools difficult.

Law firms face a structural vulnerability: their holdings of highly sensitive client data make them economically attractive targets, and their reluctance to resist ransom demands—driven by fear of client exposure—reinforces the incentive to attack. Attorneys should assume their firms are targets and audit employee protocols for vishing calls, particularly requests to install remote access software or disable security tools. The group's demonstrated ability to compromise major firms, combined with tactics that evade signature-based detection, means standard cybersecurity measures alone are insufficient.

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