Reference:
The vSRX is a virtual security appliance that runs on a virtual machine. It provides firewall, VPN, and other security services in a virtualized environment.
The vSRX is based on a version of Junos OS that is optimized for virtualization. It runs on a Linux kernel and uses a KVM hypervisor. It supports VMware ESXi and KVM hypervisors.
The vSRX has support for VMXNET3 vNICs, which are high-performance virtual network interfaces provided by VMware. These interfaces can provide higher throughput and lower CPU utilization than other virtual NIC types.

The two security policy features that provide the capability to permit access to an application but block its sub-applications are URL filtering and micro application detection. URL filtering allows you to create policies that permit or block access to certain websites or webpages based on URL patterns. Micro application detection is a more sophisticated approach that can identify and block specific applications, even if they are embedded within other applications or websites. According to the Juniper Networks Certified Internet Specialist (JNCIS-SEC) Study Guide [1], "micro application detection is the most accurate way to detect and control applications." Content filtering and APPID are more general approaches and are not as effective in providing the level of granularity needed to block sub-applications.

According to the Juniper Networks JNCIS-SEC Study Guide, Juniper ATP Cloud sets target thresholds for security events and then continuously scans the environment for any activity that exceeds this threshold. Once the threshold is met, Juniper ATP Cloud continues looking for threats for a period of 0 to 5 minutes. The threat levels range from 0 to 10, with 0 being the lowest and 10 being the highest.