Ransomware has evolved from simple phishing attacks to advanced, targeted campaigns that exploit legitimate Remote Access Tools (RATs) like AnyDesk and UltraViewer. These tools, initially intended for IT support, are misused by attackers for stealthy access and control over networks. They can operate unnoticed due to their trusted status and the fact that organizations often whitelist them, making detection and mitigation difficult. The article emphasizes that while RATs are not inherently malicious, poor configuration and management can lead to exploitation. The ransomware kill chain details the stages of an attack, starting with credential compromise. Attackers typically gain access through brute-force methods or stolen credentials, often targeting admin accounts for greater control. Once inside, they can hijack existing RATs or silently install new ones to avoid detection. Techniques include using known command-line flags for silent installation and modifying system configurations to maintain persistence. Attackers may then disable antivirus measures and erase logs to cover their tracks, creating a challenging environment for forensic investigation. As the attack progresses, ransomware is deployed, often disguised as legitimate updates, and executed within existing remote sessions to avoid alerting users. Lateral movement occurs via credential reuse and exploitation of enterprise RATs, facilitating the spread of the attack across networks. Ultimately, the final impact involves encrypting data and blocking recovery efforts by changing RAT credentials, leaving organizations vulnerable and unable to respond effectively. Understanding this process is vital for building defenses against modern ransomware threats.