SY0-701 Security Operations — 50 Questions

Question 1

A SOC analyst receives an alert from the EDR system indicating that the process 'C:\Program Files\Vendor\Updater.exe' attempted to modify the HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run registry key on a user's workstation. The analyst checks the file hash and finds it matches a known legitimate software updater. Which of the following actions is most appropriate for the analyst to take?

Accepted Answer

Investigate the user's recent activity and check for signs of process hollowing or DLL injection.. Option C is correct because the EDR alert indicates a legitimate process (Updater.exe) modifying a critical persistence registry key (Run). Even with a known good hash, the process could be compromised via process hollowing or DLL injection, where malicious code runs under the guise of a trusted executable. Investigating user activity and checking for these attack techniques is the appropriate next step to confirm whether the behavior is benign or indicative of a threat.

Answer

Disable the software updater immediately to prevent further registry modifications.

Answer

Create an exception rule in the EDR to suppress future alerts for this process.

Answer

Isolate the workstation from the network and reimage the system immediately.

Question 2

A SOC analyst is reviewing logs from a Windows domain controller and notices a large number of failed logon attempts (Event ID 4625) from a single source IP address within a five-minute window. The account names used are random strings such as "a1b2c3", "x9y8z7", etc. The analyst then checks the source IP and finds it is a known external address from a foreign country. Which of the following is the most appropriate next step for the analyst to take?

Accepted Answer

Investigate whether any of the attempted accounts correspond to actual domain users.. Option B is correct because the analyst must first determine if any of the randomly generated account names match existing domain user accounts. If a match is found, it indicates a targeted password-spraying or brute-force attack against valid accounts, requiring immediate account lockdown and credential reset. This investigation step aligns with the incident response process of identification before containment or escalation.

Answer

Immediately block the IP address at the perimeter firewall.

Answer

Run a full antivirus scan on the domain controller.

Answer

Notify the company's legal department for law enforcement involvement.

Question 3

A security operations analyst is tuning a SIEM correlation rule designed to detect brute-force password attacks against domain user accounts. The current rule generates an alert when a single user account has more than 10 failed logon attempts within a 5-minute window. The SOC team is overwhelmed by thousands of alerts each day, the vast majority of which are triggered by legitimate users who accidentally mistype their passwords. Which of the following modifications to the rule would most effectively reduce false positives while still detecting actual brute-force attacks?

Accepted Answer

Modify the rule to trigger only when the failed attempts originate from multiple distinct source IP addresses.. Option B is correct because brute-force attacks often distribute failed attempts across multiple source IP addresses to evade detection, while legitimate users typically mistype from a single IP. By requiring failed attempts from multiple distinct source IPs, the rule filters out accidental mistypes (single IP) and still catches distributed brute-force attacks, which is a common evasion technique.

Answer

Increase the failed attempt threshold to 20 attempts within the same 5-minute window.

Answer

Modify the rule to trigger only when the failed attempts are against multiple distinct user accounts.

Answer

Add an exception to suppress alerts for any user account that has a valid password reset request within the same time period.

Question 4

A security analyst is responding to a potential ransomware incident on a Windows server that is still running. The analyst needs to preserve forensic evidence for analysis. Which of the following actions should the analyst perform first, based on the order of volatility?

Accepted Answer

Capture a full memory dump of the server. The order of volatility dictates that the most volatile data (memory) must be captured first because it contains critical evidence like running processes, network connections, and encryption keys that will be lost when the system is powered off. A full memory dump preserves this volatile data before any other actions that could alter the system state.

Answer

Shut down the server to prevent further damage

Answer

Create a forensic disk image of the hard drive

Answer

Run a full antivirus scan on the system

Question 5

A security analyst is monitoring logs from the cloud access security broker (CASB) and observes that a user account downloaded 500 GB of data from a highly sensitive SharePoint document library within a single hour. The user's historical baseline shows an average daily download of less than 10 MB. Additionally, the log shows the session originated from an IP address in a country where the company has no employees or business operations. Which of the following actions is the most appropriate for the analyst to take?

Accepted Answer

Initiate the organization's incident response process for a potential data exfiltration event.. Option C is correct because the combination of a massive data download (500 GB vs. a 10 MB baseline) and a session originating from a country with no business presence strongly indicates a potential data exfiltration event. Initiating the incident response process ensures that the organization follows a structured, documented procedure to contain, analyze, and remediate the threat, preserving forensic evidence and coordinating response actions. The CASB log provides the initial indicators, but the incident response plan is the appropriate framework for handling such high-risk anomalies.

Answer

Immediately block the user account and the source IP address at the CASB.

Answer

Contact the user directly by phone to verify whether they initiated the download.

Answer

Disable the SharePoint document library and remove all user permissions to prevent further data loss.

Question 6

A security analyst in the SOC is investigating a potential DNS tunneling incident. The analyst has identified a workstation that is making thousands of DNS queries to an external domain with base64-encoded subdomains. The analyst suspects that sensitive files from the workstation are being exfiltrated by encoding their contents into the subdomains of the DNS queries. Which of the following log sources will provide the most definitive evidence to confirm that the contents of a specific sensitive file are being transmitted in the DNS queries?

Accepted Answer

A full packet capture of the network traffic from the workstation showing the complete DNS messages.. Option C is correct because a full packet capture (PCAP) contains the complete DNS query and response messages, including the raw payload of the subdomain fields. This allows the analyst to extract the base64-encoded data from the subdomains and decode it to verify that it matches the contents of the suspected sensitive file. DNS server logs (option A) typically only record the queried domain names, not the full DNS message payload, and may truncate long subdomains. Process creation logs (option B) show which executable made the queries but not the data being sent. Firewall logs (option D) only show connection metadata (source, destination, port) and never the DNS query content.

Answer

The DNS server logs showing the queried domains and subdomains.

Answer

The workstation's process creation logs showing which process initiated the DNS queries.

Answer

The firewall logs showing outbound connections from the workstation to the external DNS server on port 53.

Question 7

A security analyst is reviewing network flow logs and notices a series of outbound connections from a single internal workstation to an external IP address on TCP port 443. The connections occur every 5 minutes, each lasting about 2 seconds, and the amount of data transferred per connection is consistently around 1 KB. The workstation's user reports no unusual activity. The analyst checks the host's EDR logs and sees no malicious processes or known indicators. Which type of activity is this pattern most consistent with?

Accepted Answer

Beaconing to a command-and-control server. This pattern is most consistent with beaconing to a command-and-control (C2) server because the connections are periodic (every 5 minutes), short-lived (2 seconds), and consistently transfer a small amount of data (~1 KB) over HTTPS (TCP 443). These characteristics—regular intervals, low data volume, and stealthy use of encrypted channels—are hallmarks of C2 beaconing used by malware to maintain persistence and receive instructions without raising immediate suspicion.

Answer

Normal software update check

Answer

DNS tunneling

Answer

Data exfiltration via HTTPS

Question 8

A security analyst in the SOC is reviewing an alert from the corporate VPN server. The alert indicates that user 'jsmith' authenticated successfully from an IP address in Brazil at 14:30 UTC. The analyst contacts jsmith, who confirms he is physically in the company's headquarters in Chicago and has not remotely accessed the VPN today. The VPN authentication logs show that jsmith's session used a valid smart card certificate for authentication. The analyst checks the certificate revocation list and finds that jsmith's certificate has not been revoked. Which of the following is the most likely explanation for this event?

Accepted Answer

The user's smart card and PIN were stolen, allowing an attacker to authenticate from Brazil.. Option A is correct because the scenario describes a successful VPN authentication using a valid smart card certificate from a location (Brazil) that the legitimate user (jsmith) denies accessing. Since the certificate was not revoked and the smart card requires both the card and PIN for use, the most plausible explanation is that both were stolen, enabling an attacker to authenticate as jsmith. The certificate revocation list (CRL) check confirms the certificate is still valid, ruling out revocation-based defenses, and the user's physical presence in Chicago eliminates the possibility of a legitimate remote session.

Answer

An attacker performed a pass-the-hash attack using cached credentials from jsmith's workstation.

Answer

The VPN server's certificate was forged, allowing the attacker to intercept jsmith's credentials.

Answer

The user's account password was guessed through a brute-force attack and then used to create a new certificate.

Question 9

A security analyst is reviewing the perimeter firewall logs. The analyst observes repeated TCP SYN packets from a single external IP address (203.0.113.50) to multiple internal IP addresses on TCP port 3389. The packets are sent with a consistent 50-millisecond interval. There are no subsequent SYN-ACK or RST packets from the internal hosts in the logs. The analyst suspects this is a reconnaissance scan. Which of the following additional log sources would provide the most definitive evidence to confirm this suspicion?

Accepted Answer

Intrusion detection system (IDS) logs from a network-based IDS placed behind the firewall. Option C is correct because a network-based IDS placed behind the firewall can inspect the full packet payload and detect the specific pattern of TCP SYN packets without corresponding SYN-ACK or RST responses, which is characteristic of a SYN scan (a type of reconnaissance scan). The IDS can correlate the consistent 50-millisecond interval and the targeting of TCP port 3389 (RDP) across multiple internal IPs, providing definitive evidence of scanning behavior that firewall logs alone cannot confirm due to lack of session completion.

Answer

DNS query logs from the internal DNS server

Answer

Web proxy logs from the corporate proxy server

Answer

VPN gateway authentication logs

Question 10

A digital forensics analyst is investigating a suspected insider threat. The analyst has acquired a laptop used by the suspect. The analyst needs to obtain a forensic image of the hard drive without altering any data. The laptop is running and logged into the suspect's user account. Which of the following is the most appropriate first step for the analyst to take?

Accepted Answer

Pull the power cord from the laptop to immediately shut down the system and prevent any further system writes.. Option A is correct because immediately removing power (hard shutdown) stops all system writes and preserves the current state of the hard drive without any further changes. This is critical in forensic acquisition to maintain data integrity and avoid altering evidence, especially when the system is logged in and actively writing to the disk.

Answer

Boot the laptop from a forensic boot CD that loads a write-blocker driver and then create a forensic image.

Answer

Perform a live acquisition of the hard drive using a network forensic tool while the system is still running.

Answer

Ask the suspect to log off and shut down the laptop normally, then remove the hard drive and image it using a write-blocker.

Question 11

A security analyst receives an alert from the intrusion detection system indicating that a workstation in the finance department has established an outbound connection to a known malicious IP address using an encrypted protocol. The analyst verifies the alert and checks the user's activity logs, which show no legitimate business reason for the connection. According to the incident response process, what should the analyst do NEXT?

Accepted Answer

Isolate the workstation from the network to contain the threat.. According to the NIST SP 800-61 incident response process, containment is the immediate priority after verification to prevent further damage or data exfiltration. Since the workstation has an active encrypted outbound connection to a known malicious IP with no legitimate business reason, isolating the network interface (e.g., disabling the port, blocking the MAC address, or unplugging the cable) stops the threat from communicating while preserving the system state for later analysis. This aligns with the containment phase, which must precede eradication or full forensic analysis.

Answer

Begin the eradication phase by immediately reimaging the workstation.

Answer

Conduct a full forensic analysis of the workstation's hard drive.

Answer

Update the firewall rule to block all outbound traffic to the malicious IP.

Question 12

A security analyst at a financial firm detects an unusual spike in outbound network traffic from a database server that normally only communicates with internal web servers. The traffic is directed to numerous external IP addresses in various countries. According to established incident response procedures, what should be the analyst's immediate next step?

Accepted Answer

Disconnect the server from the network at the switch level.. Disconnecting the server at the switch level (e.g., shutting down the switch port or placing it in a quarantine VLAN) is the immediate containment step per incident response procedures. This stops the outbound data exfiltration without risking data loss or corruption that could occur from a hard power-off, and it preserves volatile memory evidence for forensic analysis.

Answer

Run a comprehensive antivirus scan on the server.

Answer

Notify the Chief Information Security Officer (CISO) of the incident.

Answer

Power off the server to prevent further damage.

Question 13

A security analyst receives an alert from the intrusion detection system (IDS) indicating a high volume of outbound traffic from a single internal workstation to an external IP address known to be associated with a command-and-control (C2) server. The workstation's user reports no unusual activity. Which of the following should the analyst do FIRST?

Accepted Answer

Disconnect the workstation from the network.. The IDS alert indicates a high volume of outbound traffic to a known C2 server, which strongly suggests the workstation is compromised and communicating with an attacker. Disconnecting the workstation from the network (Option A) is the immediate containment step to prevent data exfiltration and further C2 communication, following the NIST incident response framework's containment phase. This action stops the threat at the network layer without waiting for additional analysis.

Answer

Run a full antivirus scan on the workstation.

Answer

Review firewall logs to see if the traffic is being blocked.

Answer

Inform the user to shut down the workstation.

Question 14

A security analyst notices repeated failed login attempts to a critical database server from a single external IP address over the past hour. The analyst reviews the authentication logs and sees that the account name used in each attempt is 'admin'. Which of the following security controls should the analyst recommend to mitigate this type of attack with minimal impact on legitimate users?

Accepted Answer

Implement a temporary block rule on the perimeter firewall for the source IP address.. Option B is correct because implementing a temporary block rule on the perimeter firewall for the source IP address directly stops the attack at the network boundary, preventing further authentication attempts without affecting legitimate users who are not using that IP. This approach is a form of dynamic IP blocking, which is a common mitigation for brute-force attacks targeting a single account from a specific external source.

Answer

Configure an account lockout policy to lock the 'admin' account after three failed attempts.

Answer

Disable the 'admin' account until the source IP can be investigated.

Answer

Require multi-factor authentication on the 'admin' account for all remote logins.

Question 15

A security analyst receives multiple alerts indicating that several users in the finance department clicked a malicious link in an email. The analyst has confirmed the email subject line and sender address. Which of the following is the BEST first step to contain the incident?

Accepted Answer

Block the sender's email address at the email gateway.. Blocking the sender's email address at the email gateway is the best first step because it immediately prevents further malicious emails from that sender from reaching any users, containing the incident at the perimeter. This action stops the spread of the attack without disrupting user productivity or requiring time-consuming analysis, aligning with the priority of containment in incident response.

Answer

Disable the users' accounts.

Answer

Perform a forensic analysis of the emails.

Answer

Delete the emails from the users' mailboxes.

Question 16

A security analyst receives an automated alert indicating that a standard user account logged in from a geographic location that is unusual for the user, and the login occurred at 3:00 AM local time. The analyst has not yet verified whether this was a successful login or if any additional suspicious activity occurred. According to standard incident response procedures, what should the analyst do NEXT?

Accepted Answer

Review the account's recent activity for signs of compromise.. The correct next step is to review the account's recent activity to gather more context. According to the NIST incident response process (Preparation, Detection & Analysis, Containment, Eradication & Recovery, Post-Incident Activity), after detection the analyst should perform analysis to validate the alert and determine the scope. Reviewing recent logins, accessed files, and other actions helps decide if containment is needed. Immediately disabling the account (A) could be premature if the alert is a false positive or if the user is traveling. Conducting a full forensic analysis (B) is too resource-intensive for a single alert without further evidence. Reporting to law enforcement (D) is not appropriate at this stage; that would occur after a confirmed incident that meets legal thresholds.

Answer

Disable the user account immediately and reset the password.

Answer

Conduct a full forensic analysis of the user's workstation.

Answer

Report the incident to law enforcement.

Question 17

A security analyst detects unusual outbound traffic from a workstation that appears to be communicating with a known malicious IP address. The analyst immediately isolates the workstation from the network. Which of the following is the NEXT step in the incident response process according to NIST SP 800-61?

Accepted Answer

Eradication. According to NIST SP 800-61, the incident response process follows a sequence: Preparation, Detection & Analysis, Containment, Eradication, Recovery, and Lessons Learned. Since the analyst has already performed containment by isolating the workstation, the next step is Eradication, which involves removing the threat (e.g., malware, backdoors) from the affected system. This ensures the root cause is eliminated before moving to recovery.

Answer

Recovery

Answer

Containment

Answer

Lessons Learned

Question 18

An organization's file server contains sensitive HR data. The security team discovers that permissions on a confidential folder have been altered. Which of the following security controls would MOST likely help determine the account responsible for this change?

Accepted Answer

Audit logging. Audit logging is the correct answer because it records detailed information about who made changes to files and folders, including the account name, timestamp, and the specific permission alteration. By reviewing audit logs, the security team can trace the unauthorized permission change back to the responsible user account. This is a detective control that directly supports accountability and forensic investigation.

Answer

Data loss prevention (DLP) system

Answer

Mandatory access control (MAC)

Answer

Host-based intrusion prevention system (HIPS)

Question 19

A security analyst detects a high volume of failed authentication attempts from IP address 203.0.113.1 against a web application. The attempts use different usernames, such as 'admin', 'root', 'test', and several common names. Account lockout policies are configured to lock an account after five failed attempts. Despite this, the analyst sees the attempts continuing over several hours. Which of the following security controls is most likely missing or improperly configured?

Accepted Answer

Configure rate limiting per source IP address. Rate limiting per source IP address is the correct control because it restricts the number of authentication requests from a single IP (203.0.113.1) within a given time window, regardless of the usernames used. Account lockout policies are ineffective here because the attacker is rotating through different usernames (e.g., 'admin', 'root', 'test'), so no single account reaches the five-failed-attempt threshold. By limiting the request rate from the source IP, the analyst can throttle the attacker's brute-force attempts without affecting legitimate users.

Answer

Increase the account lockout threshold to a lower number

Answer

Implement geofencing to block traffic from the attacker's region

Answer

Enable detailed failed login attempt logging

Question 20

A security analyst receives an alert about a user account that has been attempting to authenticate from an unusual geographic location outside of business hours. The analyst reviews the event logs and sees that the authentication attempt was successful, but the user has not reported any suspicious activity. Which of the following actions should the analyst take NEXT?

Accepted Answer

Contact the user to verify whether the authentication was legitimate. The correct next step is to contact the user to verify whether the authentication was legitimate. Since the authentication was successful and the user has not reported suspicious activity, the analyst must first gather context from the user before taking any disruptive action. This aligns with the incident response process of validation and scoping before containment.

Answer

Disable the user account immediately to prevent further access

Answer

Continuously monitor the account for additional suspicious activity

Answer

Revoke all active sessions for the user account