ECCouncil Updated 312-50v13 Exam Questions and Answers by gianna

The correct answer is B because encryption, decryption, translation, compression, and data formatting are core functions of the OSI Presentation layer, which is Layer 6. The CEH networking material states that the Presentation layer formats data for the Application layer, translates data into a common format, and that data compression and encryption occur at this layer. In the scenario, PKI is used to protect a sensitive email so that only user B can read it. CEH cryptography concepts explain that asymmetric encryption uses separate keys: the recipient’s public key is used to encrypt the data, and the recipient’s private key is used to decrypt it. Although email itself is an application-layer service, the OSI function of encoding, encrypting, and decrypting message data maps to the Presentation layer. Transport handles end-to-end delivery, Session manages conversations, and Application provides user-facing network services. Therefore, the best answer is Presentation.

The correct answer is A. Call Spoofing because the defining behavior in the scenario is manipulating the caller ID information so that the victim’s phone displays a trusted number—specifically, the credit union’s official line. In CEH-aligned social engineering and mobile attack discussions, call spoofing is a technique where an attacker falsifies caller ID data to impersonate a legitimate organization, department, or known contact. This increases credibility and exploits human trust in recognized numbers, making victims more likely to comply with sensitive requests such as disclosing usernames, passwords, or one-time codes.

The attack is also a form of vishing (voice phishing), where the attacker uses phone calls and persuasive pretexts (“mandatory security check”) to trick employees into revealing credentials. The success factor here is the authority and legitimacy signal created by the spoofed number. When staff see what appears to be an official institutional phone number, they are more likely to assume the call is authentic and bypass normal verification steps, especially under time pressure or when framed as a security requirement.

Why the other options are incorrect: OTP hijacking refers to stealing or intercepting one-time passwords (for example via SIM swap, malware, or social engineering focused specifically on MFA/OTP codes). While the attacker could ask for OTPs, the scenario’s core mechanism is the spoofed caller ID, not OTP interception. Bluebugging is a Bluetooth-based attack that gains unauthorized control over a device through Bluetooth vulnerabilities; it is unrelated to caller ID impersonation. SMiShing is phishing via SMS/text messages, not a voice call.

Therefore, the mobile attack vector demonstrated—displaying a trusted institutional number to deceive employees during a credential-harvesting call—is call spoofing.

The correct option is B because it uses vendor-based MAC spoofing, which is the most direct way to make traffic appear to come from a device manufactured by a specific, recognizable vendor (in this case, “Dell”). In MAC addressing, the first portion of the MAC address is the OUI (Organizationally Unique Identifier), which identifies the vendor/manufacturer. Many security and asset tools perform lightweight device profiling by correlating observed OUIs with known vendors, and MAC-based logs may record or flag devices based on whether their OUIs match expected corporate endpoints.

Nmap supports MAC spoofing in a way that allows specifying a vendor name so the resulting MAC address is generated with an OUI associated with that vendor. This matches the requirement in the scenario: the tester wants the scan traffic to “blend in with legitimate devices” by adopting a vendor-associated identifier rather than using a random or obviously unusual MAC prefix.

Why the other options are less appropriate:

A provides only a partial prefix-like value (not a full MAC), and it does not explicitly map to a vendor name, making it less aligned with “specific hardware vendor” blending.

C uses 0 (zero), which is commonly associated with generating a random MAC rather than selecting a specific vendor identity; randomization does not guarantee blending with a chosen vendor’s footprint.

D supplies a full explicit MAC address; while this can spoof a MAC, it does not inherently express the intent to “appear as a specific vendor” unless you already know that exact MAC’s OUI belongs to the desired vendor. The question emphasizes selecting a vendor-associated identifier directly, which is exactly what option B does.

So, the best match for vendor-based disguise is B.

CEH v13 identifies covert channels in legacy industrial protocols as among the hardest sniffing techniques to detect. Modbus, widely used in OT and ICS environments, lacks authentication and encryption, making it ideal for covert communication.

Attackers can manipulate function codes and payload timing to exfiltrate data without triggering traditional IDS signatures. CEH v13 highlights that OT protocols often bypass deep inspection tools, making covert channels extremely stealthy.

Other options are less realistic or less persistent in modern enterprise environments.