As security measures get better at identifying and blocking malware and other threats, modern adversaries are constantly crafting sophisticated techniques to evade detection. One of the most persistent evasion techniques involves fileless attacks, which do not require malicious software to break into a system. Instead of relying on executables, these threats misuse tools that are already in the system to initiate attacks.
The 2019 Trend Micro security roundup mentioned how common fileless threats have become. By tracking non-file-based indicators and through technologies like endpoint detection and response, we blocked more than 1.4 million fileless events in the past year.
Source: Trend Micro