Subissues
| Summary | Description |
|---|---|
| Port Scan | Adversaries may perform a port scan on a system, device, or network to identify live hosts, enumerate open ports and running services, identify operating systems, and map out the network.(Citation: NIST SP 800-82r3) The results of a port scan may inform adversary [Discovery](https://attack.mitre.org/tactics/TA0102), [Lateral Movement](https://attack.mitre.org/tactics/TA0109), and vulnerability exploitation decisions ([Exploitation for Evasion](https://attack.mitre.org/techniques/T0820), [Exploitation for Privilege Escalation](https://attack.mitre.org/techniques/T0890), [Exploitation of Remote Services](https://attack.mitre.org/techniques/T0866)). Some common tools for executing a port scan include `nmap`, `netcat`, and the Advanced Port Scanner. |
| Multicast Discovery | Adversaries may perform multicast discovery requests which is when one system or device sends messages to all systems and devices in a pre-defined group on a network (or subnet) and then waits for a response. If a response is received that means the system or device that responded is live and can communicate over that protocol. Multicast discovery tends to be stealthier than broadcast discovery because every system or device on the network (or subnet) is not being messaged. One common OT protocol that has a multicast discovery mechanism is the Process Field Network (PROFINET) Discovery and Configuration Protocol (DCP) with its Identify All requests.(Citation: Cisco Active Discovery) |
| Broadcast Discovery | Adversaries may perform broadcast discovery requests to enumerate systems and devices on a network. Broadcast discovery works by one system or device sending messages to all systems and devices on a network (or subnet) and then waiting for a response. If a response is received that means the system or device that responded is live and can communicate over that protocol. Adversaries may leverage different protocols supported on the network for sending broadcast messages. Some common OT protocols that have broadcast discovery mechanisms are Building Automation and Control Network (BACNet) Who-Is requests, Common Industrial Protocol (CIP) List Identity User Datagram Protocol (UDP) broadcast requests, and Siemens S7 broadcast identification requests.(Citation: Broadcasting BACnet)(Citation: Cisco Active Discovery) |
Linked Issues
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