Intel researchers have discovered a way to hide malicious code in Intel SGX enclaves. The enclaves are a hardware-based memory encryption feature in modern processors that isolates sensitive code and data to protect it from disclosure or modification. The attack also uses Transactional Synchronization eXtensions (TSX), found in modern Intel CPUs, in conjunction with a novel fault-resistant read primitive technique called TSX-based Address Probing (TAP) The mitigations against such attacks could be implemented in future generations of Intel CPUs.
Source: https://thehackernews.com/2019/02/intel-sgx-malware-hacking.html