312-50v13 Exam Dumps - Certified Ethical Hacker Exam (CEHv13)

The attack scenario is best described as Instant Messenger Applications, and the measure that could have prevented it is verifying the sender’s identity before opening any files. Instant Messenger Applications are communication tools that allow users to exchange text, voice, video, and file messages in real time. However, they can also be used as attack vectors for spreading malware, such as viruses, worms, or Trojans, by exploiting the trust and familiarity between the users. In this scenario, the attacker compromised one of the team member’s messenger account and used it to send malicious files to the other team members, who may have opened them without suspicion, thus infecting their systems. This type of attack is also known as an instant messaging worm12.

To prevent this type of attack, the users should verify the sender’s identity before opening any files sent through instant messenger applications. This can be done by checking the sender’s profile, asking for confirmation, or using a secure channel. Additionally, the users should also follow other security tips, such as using strong passwords, updating the application software, scanning the files with antivirus software, and reporting any suspicious activity34.

https://en.wikipedia.org/wiki/Kismet_(software)

Kismet is a network detector, packet sniffer, and intrusion detection system for 802.11 wireless LANs. Kismet will work with any wireless card which supports raw monitoring mode, and can sniff 802.11a, 802.11b, 802.11g, and 802.11n traffic.

-A: Perform an aggressive scan which select most of the commonly used options within nmap

-Pn: Means Don't ping

-p:scan specific ports

-sT: TCP Connect scan

-O: Operating system detection

-T0: timing template (extremely slow- evade FW)0

The CEH Footprinting and Reconnaissance module describes DNS interrogation as a valuable technique for extracting publicly available infrastructure information such as A records, MX records, NS records, and subdomains.

DNS can reveal:

Subdomains (via zone transfers, brute forcing, or enumeration)

Mail server IP addresses (MX records)

Server locations inferred from IP geolocation

However, DNS does not store authentication credentials. Usernames and passwords are protected within authentication systems and directories, not DNS records.

Therefore, option A is correct.

CEH clearly states that DNS reconnaissance is limited to infrastructure metadata, not sensitive user credentials.

According to CEH v13 Network Scanning Techniques, a FIN scan is a stealth scanning method that sends TCP packets with only the FIN flag set. Its behavior relies on RFC 793, which specifies that closed ports must respond with a TCP RST, while open ports should silently drop the packet.

However, modern firewalls, IDS/IPS systems, and hardened TCP/IP stacks often filter or silently drop FIN packets regardless of port state. Therefore, when a FIN scan results in no response from a large number of ports, it does not conclusively indicate that the ports are open. Instead, CEH v13 stresses that this behavior commonly points to packet filtering by firewalls or security controls.

Option A is incorrect because a lack of response does not definitively mean ports are closed. Option B is an overreaction; stealth scan anomalies alone do not indicate a breach. Option C is unlikely because congestion would impact multiple protocols, not selectively suppress FIN responses.

CEH v13 recommends that when FIN scans produce ambiguous results, analysts should correlate findings using additional scan types (such as SYN scans) and investigate firewall rules and filtering behavior. Thus, option D is the most accurate interpretation and aligns with CEH guidance.

Comprehensive and Detailed Explanation:

Fake antivirus (also known as scareware) tricks users into downloading malware disguised as legitimate antivirus software.

The best approach:

Google the product name and URL.

Check reputable forums, antivirus vendors, or security advisories.

Look for phishing warnings or reports of malware.

From CEH v13 Courseware:

Module 7: Social Engineering and Phishing Scams

Module 6: Malware Threats → Rogue Software

In CEH v13 Mobile, IoT, and OT Hacking, Bluetooth Low Energy (BLE) attacks often involve capturing pairing exchanges. If the Long-Term Key (LTK) is not captured, decryption is not immediately possible.

CEH v13 explains that in such cases, attackers may attempt Btlejacking, which hijacks an existing BLE connection rather than decrypting it. This allows command injection and data manipulation without needing the LTK.

Options A and B are incorrect because decryption is not the only attack path. hcitool is for discovery, not exploitation. Therefore, Option D is correct.

Bluesnarfing is the unauthorized access of information from a wireless device through a Bluetooth connection, often between phones, desktops, laptops, and PDAs (personal digital assistant).