HeartCrypt, a new packer-as-a-service (PaaS), has emerged as a powerful tool for malware operators to evade antivirus detection by injecting malicious code into legitimate binaries. Launched in February 2024, HeartCrypt has packed over 2,000 malicious payloads across 45 malware families, including LummaStealer, Remcos, and Rhadamanthys. The service, priced at $20 per file, obfuscates malware by altering control flow, leveraging position-independent code, and using disguised resources. Advanced obfuscation techniques, including stack strings, dynamic API resolution, and anti-sandbox measures, complicate detection and analysis. The packer also uses process hollowing and .NET framework features for payload execution. HeartCrypt’s rise lowers barriers for cybercriminals, increasing the volume and complexity of malware attacks. Despite security researchers analyzing its payloads, the continued evolution of such tools underscores the need for advanced threat detection and proactive security measures. Organizations must stay vigilant and update defenses to counter these sophisticated threats.