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Question 1.

A security analyst is reviewing an incident in which an endpoint communicated with a known malicious IP address shortly before suspicious PowerShell activity appeared. Which data source would provide the strongest correlation between the endpoint process and the network connection?

1. Endpoint detection and response telemetry
   2. DNS zone file only
   3. Printer logs
   4. Physical access badge records

Correct Answer: 1

Explanation:

Endpoint detection and response telemetry can correlate process execution, parent-child relationships, command-line arguments, network connections, user context, and file activity on the affected host. This makes it particularly useful when an analyst must determine whether a PowerShell process initiated the connection to a malicious IP address or whether the connection came from another process. DNS records may show name resolution but generally do not provide the same process-level context. Printer logs and physical-access records are not primary sources for this technical correlation. Analysts should combine endpoint telemetry with firewall, proxy, DNS, and authentication logs to create a reliable timeline and validate whether the observed behavior represents malicious execution.

Question 2.

Which security analysis concept involves combining events from multiple sources to determine whether they are related to the same incident?

1. Data normalization
   2. Event correlation
   3. Data destruction
   4. Network address translation

Correct Answer: 2

Explanation:

Event correlation links activity from multiple data sources to identify relationships that may not be obvious when each log is viewed independently. For example, an analyst might correlate a phishing email, a suspicious process launch, DNS queries, firewall connections, and authentication events to reconstruct an attack sequence. Normalization converts data into consistent formats so it can be analyzed more effectively, but correlation is the step that connects events based on common attributes such as time, user, host, IP address, or process. Network address translation and data destruction are unrelated. Effective correlation helps reduce isolated alerts and provides a more complete view of adversary behavior across the environment.

Question 3.

A security team receives thousands of alerts each day, many of which are benign. Which activity should be performed first to determine which alerts require immediate investigation?

1. Evidence destruction
   2. System reimaging
   3. Alert triage
   4. Firewall replacement

Correct Answer: 3

Explanation:

Alert triage is the process of rapidly reviewing and prioritizing security alerts based on severity, confidence, affected assets, threat intelligence, and potential business impact. The goal is to identify which alerts represent credible threats that require deeper investigation. Reimaging systems before investigation can destroy useful evidence, while replacing infrastructure without evidence is unnecessary. Triage often involves validating indicators, reviewing contextual data, determining whether the alert is a true positive, and assigning an appropriate priority. Mature security operations centers use consistent triage procedures and enrichment data so analysts can focus limited resources on events most likely to represent meaningful risk.

Question 4.

Which type of evidence is most useful for showing the exact commands executed by a suspicious PowerShell process?

1. Building access logs
   2. DHCP lease history only
   3. Physical inventory records
   4. PowerShell logging or EDR command-line telemetry

Correct Answer: 4

Explanation:

PowerShell logging and endpoint telemetry can capture command-line arguments, script execution details, process relationships, and sometimes script block contents. This information is extremely valuable when investigating suspicious PowerShell activity because it may reveal encoded commands, download locations, persistence actions, or credential-access attempts. DHCP history can help associate an IP address with a device at a particular time but does not normally show executed commands. Physical records are also unrelated to command execution. Analysts should preserve relevant logs and correlate them with endpoint, network, and authentication data to determine what the PowerShell activity actually performed and whether additional hosts were affected.

Question 5.

Which indicator is most likely to be considered an indicator of compromise rather than an indicator of attack?

1. A known malicious file hash found on a workstation
   2. A general technique involving password spraying
   3. An adversary objective to gain persistence
   4. A threat actor’s preferred targeting strategy

Correct Answer: 1

Explanation:

A known malicious file hash found on a workstation is a concrete indicator of compromise because it represents observable evidence associated with malicious activity. Indicators of compromise can include malicious hashes, IP addresses, domains, registry artifacts, files, or other technical evidence. Indicators of attack are often more behavioral and describe methods or patterns that suggest an attack may be underway, such as password spraying, credential dumping, or unusual process chains. Strategic objectives and targeting preferences provide threat context but are less directly tied to a specific compromised system. Analysts should avoid relying exclusively on static indicators because adversaries can change hashes, domains, and infrastructure quickly; behavioral detection adds resilience.

Question 6.

A security analyst wants to determine whether a suspicious domain was newly registered and may have been created for a phishing campaign. Which source would be most useful?

1. Endpoint memory only
   2. Domain registration and passive DNS intelligence
   3. Local printer configuration
   4. Switch interface counters only

Correct Answer: 2

Explanation:

Domain registration and passive DNS intelligence can provide information such as registration age, historical resolutions, hosting changes, and related infrastructure. Newly registered domains are frequently used in phishing, malware delivery, and command-and-control operations, although a new domain is not automatically malicious. Passive DNS can also reveal previous IP addresses and other domains that resolved to the same infrastructure. Endpoint memory may contain useful evidence if the domain was accessed, but it does not provide the broader registration context. Analysts should combine domain age with reputation, certificate data, email context, DNS behavior, and endpoint activity before deciding whether the domain is malicious.

Question 7.

Which framework is commonly used to map adversary tactics and techniques observed during an investigation?

1. MITRE ATT&CK
   2. ITIL only
   3. PCI DSS only
   4. COBIT only

Correct Answer: 1

Explanation:

MITRE ATT&CK is widely used to describe adversary tactics, techniques, and sub-techniques based on observed behaviors. Security analysts can map incident activity such as PowerShell execution, credential dumping, lateral movement, scheduled-task persistence, or command-and-control traffic to ATT&CK techniques. This creates a consistent language for detection engineering, threat hunting, incident reporting, and gap analysis. ITIL focuses primarily on service management, PCI DSS defines payment-card security requirements, and COBIT provides governance guidance. ATT&CK does not identify a threat actor by itself; it provides a structured model for describing how adversaries operate and for evaluating whether security controls can detect those behaviors.

Question 8.

An analyst observes hundreds of failed logins against many user accounts from one external IP address, followed by a successful login to one account. Which attack is most likely?

1. SQL injection
   2. ARP spoofing
   3. DNS tunneling
   4. Password spraying

Correct Answer: 4

Explanation:

Password spraying involves attempting a small number of commonly used passwords across many accounts rather than trying many passwords against one account. This can help attackers avoid individual account lockout thresholds. A pattern of failures across many users followed by a successful login is consistent with this technique. SQL injection targets database-backed applications, ARP spoofing manipulates local network address resolution, and DNS tunneling uses DNS traffic as a covert communication channel. Analysts should review the successful account’s subsequent activity, source IP reputation, MFA events, geographic information, and other authentication logs. The account may need to be disabled or its credentials reset depending on the incident-response process.

Question 9.

Which log source is most useful for investigating repeated failed authentication attempts against an Active Directory environment?

1. Domain controller security logs
   2. Printer spooler logs only
   3. Browser bookmarks
   4. Monitor event logs

Correct Answer: 1

Explanation:

Domain controller security logs contain authentication and account-related events that are central to investigating failed logins in an Active Directory environment. They can provide information about usernames, source systems, logon types, authentication methods, and failure reasons. This allows analysts to identify password spraying, brute-force activity, disabled account use, or anomalous login patterns. Printer or display-related logs do not provide the same authentication context. Analysts should often correlate domain controller events with VPN, cloud identity, endpoint, and firewall logs to determine whether failed attempts originated externally, from an infected internal host, or from a legitimate device using stale credentials.

Question 10.

A SIEM receives logs from firewalls, endpoints, servers, and cloud applications in many different formats. Which process makes these records easier to search and correlate consistently?

1. Packet fragmentation
   2. Data normalization
   3. System imaging
   4. Physical segmentation

Correct Answer: 2

Explanation:

Data normalization converts different log formats into a consistent schema so analysts and detection rules can reference common fields such as source IP, destination IP, username, hostname, process, and timestamp. Without normalization, every vendor’s logs may require different query syntax and field interpretation. Normalization therefore improves search, correlation, dashboards, and automated analytics across heterogeneous environments. It does not prove that an event is malicious; it simply creates consistency. Packet fragmentation, system imaging, and physical segmentation serve different purposes. Analysts should still understand the original data source because some details may be lost or interpreted differently during normalization, and raw logs may be needed for deeper forensic analysis.

Question 11.

Which activity is most appropriate when an analyst wants to proactively search the environment for evidence of an adversary that may have bypassed existing detections?

1. Threat hunting
   2. Disk formatting
   3. Asset disposal
   4. Password sharing

Correct Answer: 1

Explanation:

Threat hunting is a proactive security activity in which analysts search for evidence of malicious behavior that may not have triggered existing alerts. Hunts are often based on hypotheses, threat intelligence, known adversary techniques, unusual telemetry, or weaknesses in current detection coverage. For example, analysts might search for unusual PowerShell execution patterns, suspicious scheduled tasks, anomalous authentication, or uncommon outbound connections. Threat hunting differs from traditional alert response because the analyst begins with a hypothesis rather than an existing confirmed alert. Successful hunts can reveal hidden compromises and can also improve future detection rules. Any findings should be validated carefully to avoid treating legitimate administrative behavior as malicious.

Question 12.

A security analyst notices DNS queries containing unusually long, encoded-looking subdomains generated at a regular interval. Which activity should be suspected?

1. Normal DHCP renewal
   2. Printer discovery
   3. Routine NTP synchronization
   4. DNS tunneling

Correct Answer: 4

Explanation:

DNS tunneling can encode data into DNS queries or responses, allowing attackers to use DNS as a covert communication or data-exfiltration channel. Unusually long, high-entropy subdomains generated repeatedly can be one indicator of this behavior. Legitimate services can also generate complex DNS names, so analysts should validate the pattern using domain reputation, query frequency, endpoint context, destination infrastructure, and process telemetry. DHCP renewal and NTP synchronization have different traffic characteristics, while printer discovery does not normally create persistent encoded DNS queries. Analysts may also compare query lengths and entropy against baseline behavior and inspect whether the domain is newly registered or associated with known malicious infrastructure.

Question 13.

An analyst needs to preserve volatile evidence from a compromised workstation before powering it off. Which data should generally be collected first?

1. Memory contents
   2. Archived paper records
   3. Monitor serial number
   4. Printed documentation

Correct Answer: 1

Explanation:

Memory is volatile evidence because its contents can disappear when the system loses power. RAM may contain running processes, injected code, active network connections, encryption keys, command history, credentials, and malware artifacts that are unavailable from disk alone. For that reason, memory acquisition is often prioritized before shutdown when the investigation requires volatile evidence and organizational procedures permit collection. Physical documentation and hardware serial numbers are far less volatile. Evidence acquisition must follow established procedures to preserve integrity and chain of custody. Analysts should document the collection method, timestamps, tools used, and hashes of collected evidence where appropriate. They should also avoid unnecessary interaction with the compromised system because every action can modify its state.

Question 14.

Which forensic principle documents who collected, transferred, stored, and accessed evidence throughout an investigation?

1. Least privilege
   2. Chain of custody
   3. Load balancing
   4. Network segmentation

Correct Answer: 2

Explanation:

Chain of custody documents the handling of evidence from the time it is collected through storage, transfer, analysis, and final disposition. It records who had possession of the evidence, when transfers occurred, and how the evidence was protected. This helps demonstrate that the evidence was not altered or mishandled. Least privilege is an access-control principle, while load balancing and network segmentation are infrastructure concepts. In security investigations, especially those that may lead to legal, regulatory, or disciplinary action, accurate chain-of-custody documentation can be essential. Evidence integrity should also be supported through cryptographic hashes, controlled storage, restricted access, and documented forensic procedures.

Question 15.

Why should an analyst calculate a cryptographic hash of a forensic disk image?

1. To verify evidence integrity
   2. To increase disk capacity
   3. To change file ownership
   4. To encrypt network traffic

Correct Answer: 1

Explanation:

A cryptographic hash creates a reproducible value representing the contents of evidence. By calculating a hash when the forensic image is acquired and comparing it later, investigators can verify that the evidence has not been altered. This supports forensic integrity and can strengthen chain-of-custody documentation. Hashing does not increase storage, change ownership, or encrypt network traffic. Analysts commonly preserve original evidence and perform analysis on verified forensic copies rather than directly modifying the source device. If a later hash differs unexpectedly, the investigator must determine whether the evidence was altered, corrupted, or acquired differently. Strong evidence-handling procedures are essential when investigative findings may be subject to audit or legal scrutiny.

Question 16.

Which action is most appropriate immediately after confirming that a workstation is actively communicating with known command-and-control infrastructure?

1. Continue normal user activity to gather more browsing history
   2. Delete all logs
   3. Isolate the workstation according to incident-response procedures
   4. Disable security monitoring

Correct Answer: 3

Explanation:

Isolation helps contain the incident by preventing the compromised workstation from communicating with command-and-control infrastructure, spreading malware, accessing shared resources, or exfiltrating additional data. The exact isolation method should follow organizational incident-response procedures and may involve EDR network containment, VLAN changes, or physical disconnection. Deleting logs destroys evidence, while disabling monitoring reduces visibility. Analysts should balance containment with evidence-preservation requirements because abruptly shutting down a system may destroy volatile data. In some investigations, memory or other volatile evidence may need to be captured first if it can be done safely and quickly. After containment, the team can continue scoping the incident and determining whether other endpoints are affected.

Question 17.

Which incident-response phase focuses on determining what happened, how it happened, and which systems are affected?

1. Identification and analysis
   2. Asset disposal
   3. Procurement
   4. License renewal

Correct Answer: 1

Explanation:

Identification and analysis involve validating suspicious activity, determining whether an incident has occurred, understanding the attack path, assessing scope, and identifying affected systems, users, and data. Analysts examine alerts, logs, endpoint telemetry, network traffic, threat intelligence, and other evidence to build an accurate picture of the event. This phase guides later containment, eradication, and recovery decisions. Procurement, asset disposal, and licensing are operational tasks but are not incident-analysis phases. Effective analysis should establish a timeline, distinguish confirmed evidence from assumptions, and identify gaps requiring additional collection. Rushing directly to remediation without understanding scope can leave compromised systems or persistence mechanisms behind.

Question 18.

A security team removes malware from an affected endpoint but does not eliminate the attacker’s persistence mechanism. What is the most likely result?

1. The workstation will automatically become more secure
   2. The attacker may regain access
   3. All logs will become encrypted
   4. The firewall will stop functioning permanently

Correct Answer: 2

Explanation:

If a persistence mechanism remains after the visible malware is removed, the attacker may regain access or reinstall malicious components. Persistence can take many forms, including scheduled tasks, services, registry entries, startup items, compromised credentials, remote-management tools, or modified application settings. Effective eradication therefore requires more than deleting a detected file. Analysts should identify the full attack chain and remove all persistence mechanisms, reset compromised credentials where necessary, patch exploited vulnerabilities, and verify that the system is clean before returning it to production. Recovery should include monitoring for recurrence because a previously compromised endpoint may continue showing related activity if the root cause has not been addressed.

Question 19.

Which activity should occur after an incident has been contained, eradicated, and systems have been restored to normal operation?

1. Lessons-learned review
   2. Delete all incident documentation
   3. Disable logging permanently
   4. Remove endpoint security tools

Correct Answer: 1

Explanation:

A lessons-learned review examines what happened during the incident, how effectively the organization responded, which controls succeeded or failed, and what improvements should be made. It can identify detection gaps, communication problems, procedural weaknesses, missing telemetry, training needs, or architectural changes. Deleting documentation or disabling security controls would undermine future defense. Lessons learned should result in actionable improvements, such as new detection rules, updated playbooks, improved segmentation, stronger authentication, or user training. The review should be based on evidence and should focus on improving the process rather than assigning blame. Documenting the incident timeline and response decisions creates valuable organizational knowledge for future events.

Question 20.

An analyst completes an investigation and confirms that a security alert was triggered by legitimate administrative activity rather than malicious behavior. How should the alert be classified?

1. True positive
   2. True negative
   3. False negative
   4. False positive

Correct Answer: 4

Explanation:

A false positive occurs when a security control generates an alert for activity that is ultimately determined to be legitimate. The detection fired, but the condition was not actually malicious. A true positive is an alert correctly identifying malicious activity. A false negative occurs when malicious activity happens but is not detected, while a true negative refers to legitimate activity that correctly generates no alert. Analysts should document why an alert was considered a false positive and determine whether the detection logic can be tuned safely. Excessive false positives create alert fatigue, but overly aggressive tuning can reduce visibility and create false negatives, so adjustments should preserve meaningful detection coverage.