Concepts and technologies disclosed herein are directed to an installable mutable intelligent security package (“IMISP”) and security system in Internet of Things (“IoT”) networks. According to one aspect disclosed herein, an IoT device can receive an IMISP. The IMISP can scan a plurality of memory locations of the memory for an IMISP operating system process. In response to finding the IMISP operating system process in a memory location of the plurality of memory locations, the IMISP and the IMISP operating system process can conduct a mutual authentication process. In response to a successful result of the mutual authentication process, the IMISP can self-install in the memory location. The IMISP can then scan the memory of the IoT device for an anomaly. In response to finding the anomaly, the IMISP can generate report that includes information associated with the anomaly.