Ransomware Actor Uses TeamViewer to Gain Initial Access to Networks

Huntress observed two failed attempts to deploy ransomware (apparently built from a leaked LockBit 3.0 builder) after attackers obtained initial access to endpoints via TeamViewer; logs indicate the same actor accessed two separate endpoints, likely using compromised or brokered credentials. The report outlines past misuse of TeamViewer for malware, cryptomining, and data exfiltration, discusses possible credential theft vectors, and summarizes TeamViewer security recommendations (strong passwords, 2FA, allow-lists, updates).