Nefilim is among a new breed of ransomware families that use advanced techniques for a more targeted and virulent attack. It is operated by a group that Trend Micro tracks under the intrusion set “Water Roc”. This group combines advanced techniques with legitimate tools to make them significantly harder to detect and respond before it is too late.This allows them to remain undetected in the system for weeks, navigating across the environment to maximize their damage. Before the attack is even initiated, deep victim profiling is done, allowing them to use victim-specific extortion pricing to tailor the ransom. Along with a new wave of double extortion ransomware families, Nefilim affiliates are particularly vicious when victims don’t immediately pay the ransom, leaking their sensitive data over an extended period of time. They are one of few groups that host leaked victim data long-term, for months to years, using it to deliver a chilling message to future victims.
When evaluating a Managed Detection & Response (MDR) service there are 5 critical components that