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| Section | Objectives |
|---|---|
| Topic 1: Wireless Security | |
| Topic 2: System Hacking and Exploitation | |
| Topic 3: Web Application Security | |
| Topic 4: Scanning and Enumeration | |
| Topic 5: Social Engineering | |
| Topic 6: Information Gathering (Reconnaissance) | |
| Topic 7: Ethical Hacking Fundamentals | |
| Topic 8: Vulnerability Assessment | |
| Topic 9: Cryptography Basics | |
| Topic 10: Malware Threats | |
| Topic 11: Network Security | |
| Topic 12: Legal and Ethics in Ethical Hacking |
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質問 # 97
What is malware?
正解：A
解説：
Malware, short for "malicious software," is a broad category of software specifically engineered to perform unauthorized and often harmful actions on a computer system, network, or device. Its primary characteristic is that it operateswithout the owner's consent. Malware is the primary tool used by cybercriminals to achieve various objectives, ranging from financial gain to corporate espionage and simple disruption.
Malware encompasses several distinct types, each with its own method of infection and goal:
* Viruses and Worms: Designed to spread from one file or computer to another, often damaging data or consuming network bandwidth along the way.
* Trojan Horses: Programs that disguise themselves as legitimate software to trick users into installing them, only to reveal a malicious "payload" once active.
* Ransomware: Encrypts the victim's data and demands payment for the decryption key.
* Spyware and Stealers: Secretly monitor user activity or steal sensitive information like passwords and credit card numbers.
* Rootkits: Specialized malware designed to provide high-level "root" access while remaining hidden from the operating system and antivirus software.
Ethical hackers study malware to understand how to defend against it. This involves analyzing "Attack Vectors" (how malware enters a system), "Persistence Mechanisms" (how it stays there), and "Command and Control" (how it communicates with the attacker). Protecting against malware requires a multi-layered defense strategy, including updated antivirus software, strictAcceptable Use Policies (AUP), and regular vulnerability scanning to close the gaps that malware exploits to infect systems.
質問 # 98
What is Shodan?
正解：C
解説：
Shodan is aspecialized search engine designed to discover and index internet-connected devices, making option C the correct answer. Unlike traditional search engines that index websites, Shodan scans IP addresses to identify exposed services, open ports, device banners, and system metadata.
Shodan is widely used by ethical hackers, security researchers, and defenders to identify misconfigured or exposed systems such as webcams, routers, servers, industrial control systems, and IoT devices. It provides insight into how devices are exposed to the public internet.
Option A is incorrect because Shodan is not an application for food services. Option B is incorrect because Shodan does not function as a web browser or general-purpose search engine.
From an ethical hacking perspective, Shodan is often used duringpassive reconnaissanceto assess external attack surfaces without directly interacting with target systems. This helps organizations identify exposure risks before attackers exploit them.
Understanding Shodan reinforces the importance of proper configuration, firewall rules, and access control.
Ethical hackers use Shodan responsibly to demonstrate how easily misconfigured devices can be discovered and targeted, encouraging stronger perimeter security and monitoring practices.
質問 # 99
What is a "Reverse Shell?
正解：C
解説：
A reverse shell is a fundamental technique used during the exploitation phase of a penetration test to gain interactive access to a target system. In a standard shell connection (Bind Shell), the attacker initiates a connection to a specific port on the victim's machine. However, modern network security controls, such as firewalls and Network Address Translation (NAT), almost always block unsolicited inbound connections. To bypass these restrictions, ethical hackers utilize a "reverse shell." In this scenario, the attacker first sets up a listener on their own machine (using a tool like Netcat or Metasploit) on a common outbound port, such as 80 (HTTP) or 443 (HTTPS). The attacker then executes a payload on the victim's machine that instructs it to initiate an outbound connection back to the attacker's listener.
Since most firewalls are configured to be permissive with outbound traffic (to allow users to browse the web), the connection from the victim to the attacker is often successful. Once the connection is established, the victim's machine hands over control of its command-line interface to the attacker. This allows the attacker to execute commands as if they were sitting at the victim's keyboard. The power of a reverse shell lies in its ability to circumvent perimeter defenses and provide a stable platform for post-exploitation activities, such as privilege escalation or lateral movement. From a defensive standpoint, organizations can mitigate this threat by implementing strict egress (outbound) filtering, which limits the ports and IP addresses that internal servers can communicate with. Monitoring for unusual outbound traffic patterns and using EDR (Endpoint Detection and Response) tools to identify unauthorized shell processes are also critical components of a robust security strategy designed to detect and terminate active reverse shell connections.
質問 # 100
What is an "exploit" in the hacking world?
正解：B
解説：
In the hacking world, an "exploit" is a specialized piece of software, a chunk of data, or a sequence of commands that takes advantage of a bug or vulnerability in a system to cause unintended or unanticipated behavior. The primary goal of an exploit is to gain unauthorized access to a computer system, escalate privileges, or trigger a denial-of-service condition. Exploits are the "keys" used by hackers to unlock the doors found during the scanning and vulnerability analysis phases.
Exploits are typically categorized into two types based on where they are launched:Remote Exploits, which work over a network without prior access to the target, andLocal Exploits, which require prior access to the system to increase privileges. Within the ethical hacking lifecycle, the "Exploitation" phase occurs after a vulnerability has been identified and verified. An ethical hacker uses a specific exploit code to demonstrate the real-world impact of a flaw, proving to the stakeholders that the vulnerability is not just a theoretical risk but a practical entry point for an attacker.
It is important to differentiate an exploit from malware (Option A); while an exploit is themethodused to get in, malware is thepayloaddelivered once the door is open. Understanding exploits is fundamental for security professionals, as it allows them to develop "signatures" for intrusion detection systems and provides the justification needed for urgent patch management. By mastering the use of exploits in a controlled environment, such as with the Metasploit Framework, ethical hackers can better defend systems by anticipating how a malicious actor would attempt to break through technical barriers.
質問 # 101
Can Nmap be used for vulnerability scanning?
正解：B
解説：
Nmap (Network Mapper) is primarily known as a powerful tool for network discovery and port scanning, but it also possesses robust vulnerability scanning capabilities through theNmap Scripting Engine (NSE). The NSE allows users to write and share simple scripts to automate a wide variety of networking tasks. One of the core categories of scripts available in the NSE is vuln, which is specifically designed to detect known security vulnerabilities on the targets being scanned.
When an ethical hacker runs a scan with the flag --script vuln, Nmap will not only identify open ports but will also cross-reference the discovered services against its internal database of vulnerabilities. For example, if Nmap detects an old version of an SMB service, it can run specific scripts to check if that service is vulnerable to well-known exploits like EternalBlue (MS17-010).
While dedicated vulnerability scanners like Nessus or OpenVAS offer more comprehensive databases and reporting features, Nmap's vulnerability scanning is highly valued for being fast, lightweight, and scriptable.
It is an excellent tool for "quick-look" assessments during the reconnaissance phase. By using NSE, testers can also perform tasks beyond simple vulnerability detection, such as:
* Brute-forcing: Attempting to guess passwords for services like SSH or FTP.
* Malware Detection: Identifying if a server has been infected by certain types of worms or backdoors.
* Configuration Auditing: Checking for insecure default settings.
Integrating Nmap's vulnerability scanning into a penetration testing workflow allows for a more seamless transition from discovery to exploitation, making it one of the most versatile tools in a security professional's toolkit.
質問 # 102
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