CPENT Iot And OT Exploitation Practice Question
An attacker is performing a man-in-the-middle attack against an industrial control network utilizing the S7comm protocol between a Siemens S7-300 PLC and an engineering station. The attacker wants to inject malicious logic into the PLC memory. Which tool can be used to craft and send malicious S7comm packets to manipulate the PLC operating mode?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
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Snap7 library scripts
Snap7 is an open-source Siemens S7 communication library that allows developers and testers to interact with Siemens PLCs. Wireshark is passive, Metasploit has limited industrial modules, and Scapy can craft raw packets but Snap7 is the standard library for S7comm manipulation.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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Snap7 library scripts
Why this is correct
Snap7 provides a set of communication functions specifically designed to interface with Siemens S7 PLCs, allowing block reading, writing, and mode switching.
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Aircrack-ng
Why it's wrong here
Aircrack-ng is used for wireless 802.11 auditing.
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Hydra
Why it's wrong here
Hydra is a login cracker supporting numerous protocols, but not S7comm.
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Wireshark
Why it's wrong here
Wireshark is a packet capture and analysis tool, not an injection or active exploitation framework for S7comm.
About these practice questions
This CPENT question is part of Courseiva's 276-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official EC-Council exam blueprint
This CPENT practice question is part of Courseiva's free EC-Council certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CPENT exam.