MSI Installer, commonly accessed via the msiexec.exe utility, is a Windows component used to install, maintain, and remove software packaged in MSI (Microsoft Installer) files. It streamlines software deployment and ensures consistent installations across systems. However, attackers sometimes exploit MSI Installer to distribute malware by disguising malicious payloads as legitimate installation packages. Security best practices include verifying software sources and monitoring msiexec activity for suspicious behavior to prevent unauthorized or harmful installations.