Question 1

A secretary receives an email from a friend with a picture of a kitten in it. The secretary forwards it to
the
~COMPANYWIDE mailing list and, shortly thereafter, users across the company receive the following
message:
“You seem tense. Take a deep breath and relax!”
The incident response team is activated and opens the picture in a virtual machine to test it. After a
short analysis, the following code is found in C:
\Temp\chill.exe:Powershell.exe –Command “do {(for /L %i in (2,1,254) do shutdown /r /m Error!
Hyperlink reference not valid.> /f /t / 0 (/c “You seem tense. Take a deep breath and relax!”);Start-
Sleep –s 900) } while(1)”
Which of the following BEST represents what the attacker was trying to accomplish?

Accepted Answer

B

Explanation: The provided code executes a PowerShell command within an infinite loop (do...while(1)). The core of this loop is the shutdown command and a Start-Sleep cmdlet. The shutdown /r switch specifically instructs the operating system to reboot, not shut down. The /c switch displays the taunting message. The Start-Sleep –s 900 command pauses the script's execution for 900 seconds. Converting seconds to minutes (900 / 60) equals 15 minutes. Therefore, the script's intent is to display the message and initiate a system reboot every 15 minutes.

Question 2

Which of the following should normally be blocked through a firewall?

Accepted Answer

A

Explanation: Simple Network Management Protocol (SNMP) is used for managing and monitoring network devices. Exposing SNMP to the internet is a significant security vulnerability, as it can reveal sensitive information about a network's infrastructure, device configurations, and operational status. Attackers can leverage this information for detailed reconnaissance. Security best practices strongly recommend that access to management protocols like SNMP be restricted to trusted, internal management networks and that all SNMP traffic from the public internet be blocked at the perimeter firewall.

Question 3

Tcpdump is a tool that can be used to detect which of the following indicators of compromise?

Accepted Answer

A

Explanation: tcpdump is a command-line packet analyzer used for capturing and analyzing network traffic. Its primary function in a security context is to provide raw data for network forensics and incident response. By inspecting the contents, headers, sources, and destinations of packets, an analyst can identify anomalies that serve as Indicators of Compromise (IoC). These anomalies, such as traffic to or from known malicious IP addresses, data exfiltration patterns, command-and-control (C2) communications, or non-standard protocol usage, are collectively categorized as "unusual network traffic." Therefore, tcpdump is a fundamental tool for detecting this specific IoC.

Question 4

What are the two most appropriate binary analysis techniques to use in digital forensics analysis? (Choose two.)

Accepted Answer

C, D

Explanation: In digital forensics, particularly when dealing with potentially malicious executables, binary analysis is crucial. The two primary and complementary techniques used are static and dynamic analysis. Static analysis involves examining the binary file without executing it, analyzing its code, strings, and structure to understand its potential functionality. Dynamic analysis involves running the binary in a controlled, isolated environment (a sandbox) to observe its actual behavior, such as network connections, file system modifications, and registry changes. Together, these methods provide a comprehensive understanding of a binary's purpose and impact.

Question 5

A user receives an email about an unfamiliar bank transaction, which includes a link. When clicked,
the link redirects the user to a web page that looks exactly like their bank’s website and asks them to
log in with their username and password. Which type of attack is this?

Accepted Answer

D

Explanation: The scenario describes a classic phishing attack. Phishing is a form of social engineering where an attacker uses a fraudulent electronic communication, typically email, to masquerade as a trustworthy entity. The goal is to deceive the recipient into revealing sensitive information, such as login credentials or financial details. In this case, the attacker uses a deceptive email about a bank transaction to lure the user to a spoofed website designed to harvest their username and password. This method aligns perfectly with the definition of phishing.

Question 6

When performing a vulnerability assessment from outside the perimeter, which of the following network devices is MOST likely to skew the scan results?

Accepted Answer

C

Explanation: A firewall is a network security device situated at the perimeter, designed to monitor and control incoming and outgoing traffic based on a defined set of security rules. When a vulnerability assessment is conducted from an external source, the firewall's primary function is to block unsolicited and potentially malicious probes from the scanner. This action inherently skews the results by hiding internal systems and open ports, preventing the scanner from obtaining an accurate picture of the internal network's security posture. The scan report will reflect the hardened state of the firewall, not the true state of the devices behind it, leading to false negatives.

Question 7

Which of the following can increase an attack surface?

Accepted Answer

A

Explanation: An attack surface represents the total number of points or vectors through which an attacker can attempt to enter or extract data from a system. Old or unused code, often referred to as "dead code," directly contributes to expanding this surface. This code is no longer maintained or tested as part of the active development lifecycle, yet it remains within the production environment. It can harbor unpatched vulnerabilities, outdated dependencies, or forgotten access points that an attacker could discover and exploit. By increasing the volume of code and potential entry points without active oversight, it enlarges the overall attack surface.

Question 8

Traditional SIEM systems provide:

Accepted Answer

B

Explanation: Traditional Security Information and Event Management (SIEM) systems are designed to provide a centralized view of an organization's security posture. Their fundamental, long-standing functions are to collect and aggregate log data from various network devices and systems. This data is then normalized into a common format for easier processing. The core value of a traditional SIEM lies in its correlation engine, which applies predefined rules to identify relationships between disparate events that may indicate a security incident. When a correlation rule is met, the system generates an alert to notify security personnel for further investigation. These four functions—Aggregation, Normalization, Correlation, and Alerting—form the foundational data processing pipeline of a traditional SIEM.

Question 9

A security operations center (SOC) analyst observed an unusually high number of login failures on a
particular database server. The analyst wants to gather supporting evidence before escalating the
observation to management. Which of the following expressions will provide login failure data for
11/24/2015?

Accepted Answer

C

Explanation: The objective is to gather the actual log entries ("supporting evidence") related to login failures for a specific date. The command grep 20151124 securitylog | grep "login" correctly performs this task in two stages. First, grep 20151124 securitylog filters the securitylog file for all lines containing the string for the correct date (November 24, 2015). Second, the output is piped (|) to grep "login", which further filters the results to show only the lines containing the term "login". This provides the analyst with all login-related events from that day, including the failures, which can then be reviewed as evidence.

Question 10

ABC Company uses technical compliance tests to verify that its IT systems are configured according
to organizational information security policies, standards, and guidelines. Which two tools and
controls can ABC Company use to verify that its IT systems are configured accordingly? (Choose two.)

Accepted Answer

C, D

Explanation: Technical compliance tests are designed to verify that IT systems are configured in accordance with established security policies and standards. Performing vulnerability assessments and penetration testing (C) are active methods to test system configurations and security controls. Vulnerability scanning checks systems against databases of known vulnerabilities, which often result from misconfigurations, while penetration testing attempts to exploit such weaknesses. Both serve to verify if the system's security posture complies with policy objectives. Implementing baseline configuration security controls (D) establishes a formal, documented standard for system settings. Compliance is then verified by regularly scanning systems and comparing their current state against this approved baseline, ensuring they have not deviated from the required secure configuration.

Question 11

According to SANS, when should an incident retrospective be performed?

Accepted Answer

C

Explanation: According to the SANS Institute's widely adopted incident handling methodology, the post-incident activity, which includes the retrospective or "lessons learned" meeting, should be conducted in a timely manner. The recommended timeframe is within two weeks of the incident's conclusion. This schedule ensures that the details are still fresh in the minds of the incident response team members, which is crucial for accurately identifying both successes and failures in the response process. Holding the meeting promptly maximizes the value of the review and allows for the swift implementation of improvements to security controls, policies, and procedures.

Question 12

Which of the following can be used as a vulnerability management and assessment tool?

Accepted Answer

A

Explanation: Nessus is a widely recognized and comprehensive remote security scanning tool. Its primary function is to scan a computer or network to identify security vulnerabilities, misconfigurations, and missing patches. It provides detailed reports that are integral to the vulnerability management lifecycle, including assessment, prioritization, and remediation tracking. Unlike tools designed for a single purpose like password cracking, Nessus offers a broad spectrum of checks for thousands of potential security issues, making it a quintessential vulnerability management and assessment tool.

Question 13

A digital forensics investigation requires analysis of a compromised system's physical memory. Which of the following tools should the forensics analyst use to complete this task?

Accepted Answer

C

Explanation: The Volatility Framework is the industry-standard, open-source toolset specifically designed for the analysis of volatile memory (RAM). When a system is compromised, many artifacts of the intrusion, such as running malicious processes, network connections, injected code, and encryption keys, may only exist in physical memory and not on the disk. Volatility allows a forensics analyst to extract and analyze these ephemeral artifacts from a memory dump, which is a critical step in understanding the scope and nature of an attack. It is the most specialized and appropriate tool for the task described in the question.

Question 14

DRAG DROP What is the correct order of the DFIR phases? https://kxbjsyuhceggsyvxdkof.supabase.co/storage/v1/object/public/file-images/CertNexus_CFR-410/page_70_img_1.jpg

Accepted Answer

Explanation: The Digital Forensics and Incident Response (DFIR) lifecycle follows a standard industry framework (often referred to as PICERL, derived from SANS and aligned with NIST guidelines). The process begins with Preparation to ensure the organization is ready to respond. Identification follows to detect and validate the potential security incident. Once confirmed, Containment is prioritized to limit the scope and damage. Eradication removes the threat and root cause from the environment. Recovery restores systems to normal operation and confirms they are clean. Finally, Lessons Learned (or Post-Incident Activity) involves reviewing the incident to improve future response capabilities.

Question 15

During a log review, an incident responder is attempting to process the proxy server’s log files but
finds that they are too large to be opened by any file viewer. Which of the following is the MOST
appropriate technique to open and analyze these log files?

Accepted Answer

A

Explanation: The core problem is that the log file's size exceeds the memory capacity of standard file viewers. A hex editor is a specialized tool designed to open and analyze very large files by reading them directly from the disk in manageable segments, rather than loading the entire file into memory at once. This capability allows an incident responder to successfully open the file. Additionally, hex editors provide powerful search functionalities to locate specific text strings (e.g., IP addresses, keywords) or byte patterns within the raw data, making it a suitable technique for analysis when other tools fail.

Free CertNexus CFR-410 Actual Exam Questions