Crucial Exams

Certified Ethical Hacker (CEH) Practice Question

During an on-site assessment of a chemical plant, you perform ARP spoofing to place yourself between the HMI and a Modicon PLC. You then craft a Modbus/TCP packet with function code 0x05 (Write Single Coil) that de-energizes the primary feed pump and send it directly to the PLC on TCP port 502. Which type of OT attack does this action exemplify?

  • Stuxnet-style code-signing bypass using Siemens Step7 protocol

  • PLC firmware replacement to upload malicious ladder logic

  • Man-in-the-middle manipulation causing loss-of-view by blocking telemetry responses

  • Unauthorized command injection that causes denial-of-control over the process

Certified Ethical Hacker (CEH)
Mobile Platform, IoT, and OT Hacking
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