Nimbus Manticore, linked to the Tortoiseshell hacking group, has expanded its capabilities by deploying a new SSH-based tunneling tool and a C++ backdoor that resembles its existing malware known as TWOSTROKE. This development indicates a shift in tactics, allowing attackers to establish more secure communications with compromised systems. The increase in their malware arsenal raises concerns for organizations that may be targeted, as it suggests a growing sophistication in their operations. Companies need to be vigilant and enhance their defenses against potential intrusions, especially those using SSH protocols. The implications of this escalation could lead to more successful breaches and data exfiltration if not addressed promptly.