Calypso Apt

Calypso Advanced Persistent Threat (APT) is a significant cyber threat actor identified as using the Calypso Remote Access Trojan (RAT), according to a 2019 report by Positive Technology Security. This group, which could be an individual, private company, or part of a government entity, has been noted for its malicious intent and execution of sophisticated cyber attacks. The cybersecurity industry identifies this type of threat actor with unique naming conventions, and in this case, the Calypso APT has become associated with the use of a specific RAT. The Calypso APT uses a unique version of Win.NOODLERAT, a shellcode-formed in-memory modular backdoor. This tool was originally reported by NCC Group and Positive Technology Security. Other threat actors such as Iron Tiger and several unknown clusters have also used Win.NOODLERAT in their espionage campaigns. However, the specific variant used by Calypso APT appears to be exclusive to them, suggesting a high level of technical sophistication and bespoke development within the group. In conclusion, the Calypso APT represents a significant cybersecurity threat due to its use of advanced tools like the Calypso RAT and the unique version of Win.NOODLERAT. This group's activities were highlighted in the 2019 report by Positive Technology Security, and it has been closely monitored by cybersecurity firms since then. Its ability to customize and adapt existing tools for its own use underscores the need for continuous vigilance and adaptive defenses in the cybersecurity landscape.