The FBI and CISA have detailed Phobos ransomware deployment tactics in an advisory, part of a stop-ransomware initiative with MS-ISAC. Phobos, a ransomware-as-a-service since 2019, gains access via phishing, exploits RDP ports, and escalates privileges using Windows functions. It establishes persistence, exfiltrates data for leverage, and targets backups to prevent recovery without paying a ransom. The advisory includes compromise indicators for defense.