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ECCouncil Certified Ethical Hacker Exam (CEHv13) Sample Questions (Q219-Q224):

NEW QUESTION # 219
John is investigating web-application firewall logs and observers that someone is attempting to inject the following:
char buff[10];
buff[>o] - 'a':
What type of attack is this?

A. SQL injection
B. Buffer overflow
C. CSRF
D. XSS

Answer: B

Explanation:
Buffer overflow this attack is an anomaly that happens when software writing data to a buffer overflows the buffer's capacity, leading to adjacent memory locations being overwritten. In other words, an excessive amount of information is being passed into a container that doesn't have enough space, which information finishes up replacing data in adjacent containers.Buffer overflows are often exploited by attackers with a goal of modifying a computer's memory so as to undermine or take hold of program execution.

What's a buffer?A buffer, or data buffer, is a neighborhood of physical memory storage wont to temporarily store data while it's being moved from one place to a different . These buffers typically sleep in RAM memory. Computers frequently use buffers to assist improve performance; latest hard drives cash in of buffering to efficiently access data, and lots of online services also use buffers. for instance , buffers are frequently utilized in online video streaming to stop interruption. When a video is streamed, the video player downloads and stores perhaps 20% of the video at a time during a buffer then streams from that buffer. This way, minor drops in connection speed or quick service disruptions won't affect the video stream performance.
Buffers are designed to contain specific amounts of knowledge . Unless the program utilizing the buffer has built-in instructions to discard data when an excessive amount of is shipped to the buffer, the program will overwrite data in memory adjacent to the buffer.Buffer overflows are often exploited by attackers to corrupt software. Despite being well-understood, buffer overflow attacks are still a serious security problem that torment cyber-security teams. In 2014 a threat referred to as 'heartbleed' exposed many many users to attack due to a buffer overflow vulnerability in SSL software.
How do attackers exploit buffer overflows?An attacker can deliberately feed a carefully crafted input into a program which will cause the program to undertake and store that input during a buffer that isn't large enough, overwriting portions of memory connected to the buffer space. If the memory layout of the program is well-defined, the attacker can deliberately overwrite areas known to contain executable code. The attacker can then replace this code together with his own executable code, which may drastically change how the program is meant to figure .For example if the overwritten part in memory contains a pointer (an object that points to a different place in memory) the attacker's code could replace that code with another pointer that points to an exploit payload. this will transfer control of the entire program over to theattacker's code.

NEW QUESTION # 220
Don, a student, came across a gaming app in a third-party app store and Installed it. Subsequently, all the legitimate apps in his smartphone were replaced by deceptive applications that appeared legitimate. He also received many advertisements on his smartphone after Installing the app. What is the attack performed on Don in the above scenario?

A. SMS phishing attack
B. Clickjacking
C. Agent Smith attack
D. SIM card attack

Answer: C

Explanation:
Agent Smith Attack
Agent Smith attacks are carried out by luring victims into downloading and installing malicious apps designed and published by attackers in the form of games, photo editors, or other attractive tools from third-party app stores such as 9Apps. Once the user has installed the app, the core malicious code inside the application infects or replaces the legitimate apps in the victim's mobile device C&C commands. The deceptive application replaces legitimate apps such as WhatsApp, SHAREit, and MX Player with similar infected versions. The application sometimes also appears to be an authentic Google product such as Google Updater or Themes. The attacker then produces a massive volume of irrelevant and fraudulent advertisements on the victim's device through the infected app for financial gain. Attackers exploit these apps to steal critical information such as personal information, credentials, and bank details, from the victim's mobile device through C&C commands.

NEW QUESTION # 221
Session splicing is an IDS evasion technique in which an attacker delivers data in multiple, small sized packets to the target computer, making it very difficult for an IDS to detect the attack signatures. Which tool can be used to perform session splicing attacks?

A. Burp
B. Whisker
C. Hydra
D. tcpsplice

Answer: B

Explanation:
Many IDS reassemble communication streams; hence, if a packet is not received within a reasonable period, many IDS stop reassembling and handling that stream. If the application under attack keeps a session active for a longer time than that spent by the IDS on reassembling it, the IDS will stop. As a result, any session after the IDS stops reassembling the sessions will be susceptible to malicious data theft by attackers. The IDS will not log any attack attempt after a successful splicing attack. Attackers can use tools such as Nessus for session splicing attacks. Did you know that the EC-Council exam shows how well you know their official book? So, there is no
"Whisker" in it. In the chapter "Evading IDS" -> "Session Splicing", the recommended tool for performing a session-splicing attack is Nessus. Where Wisker came from is not entirely clear, but I will assume the author of the question found it while copying Wikipedia.
https://en.wikipedia.org/wiki/Intrusion_detection_system_evasion_techniques One basic technique is to split the attack payload into multiple small packets so that the IDS must reassemble the packet stream to detect the attack. A simple way of splitting packets is by fragmenting them, but an adversary can also simply craft packets with small payloads. The 'whisker' evasion tool calls crafting packets with small payloads 'session splicing'.
By itself, small packets will not evade any IDS that reassembles packet streams. However, small packets can be further modified in order to complicate reassembly and detection. One evasion technique is to pause between sending parts of the attack, hoping that the IDS will time out before the target computer does. A second evasion technique is to send the packets out of order, confusing simple packet re-assemblers but not the target computer.
NOTE: Yes, I found scraps of information about the tool that existed in 2012, but I can not give you unverified information. According to the official tutorials, the correct answer is Nessus, but if you know anything about Wisker, please write in the QA section. Maybe this question will be updated soon, but I'm not sure about that.

NEW QUESTION # 222
A friend of yours tells you that he downloaded and executed a file that was sent to him by a coworker. Since the file did nothing when executed, he asks you for help because he suspects that he may have installed a Trojan on his computer.
What tests would you perform to determine whether his computer is infected?

A. You do not check; rather, you immediately restore a previous snapshot of the operating system.
B. Use netstat and check for outgoing connections to strange IP addresses or domains.
C. Use ExifTool and check for malicious content.
D. Upload the file to VirusTotal.

Answer: B

Explanation:
According to CEH v13 Module 06: Malware Threats, when analyzing suspicious system behavior or investigating a suspected Trojan infection, a common and effective approach is to:
Monitor system activity and network behavior using tools like netstat, Wireshark, and TCPView.
Trojans often create covert channels or backdoors for remote access, which can be identified through unexpected or unauthorized outgoing connections to remote IP addresses or domains.
Using netstat -an or netstat -ano helps identify open ports and active connections, and checking these against known IPs can indicate whether a Trojan is communicating with a Command and Control (C&C) server.
Analysis of Each Option:
A). Use ExifTool and check for malicious content
Incorrect. ExifTool is primarily used for extracting metadata from files, especially images and documents. It is not effective for analyzing executable malware or system behavior post-execution.
B). You do not check; rather, you immediately restore a previous snapshot of the operating system Incorrect. While restoring from a snapshot might eventually be required, immediate restoration without diagnosis is not a recommended or forensically sound first step. It also prevents root cause analysis.
C). Upload the file to VirusTotal
Partially correct but not sufficient. While uploading the file to VirusTotal is a good step to confirm if the file is known malware, it does not identify whether the machine is currently infected or actively compromised.
D). Use netstat and check for outgoing connections to strange IP addresses or domains Correct. This method helps detect if the system is making suspicious external connections that are common in Trojan infections.
Reference from CEH v13 Study Guide and Course Materials:
CEH v13 Official Module 06 - Malware Threats, Section: Types of Malware - Trojans, and System Monitoring Tools CEH v13 eCourseware Lab Manual: "Detecting Trojan Activity using netstat and TCPView" CEH Engage Range: Malware Investigation Phase - Trojan Behavior Detection

NEW QUESTION # 223
A security analyst uses Zenmap to perform an ICMP timestamp ping scan to acquire information related to the current time from the target host machine.
Which of the following Zenmap options must the analyst use to perform the ICMP timestamp ping scan?

A. -Pn
B. -PP
C. -PY
D. -PU

Answer: B

NEW QUESTION # 224
......

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