SY0-701 Security Operations Practice 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.

Security Operations

SY0-701 Security Operations — Key Topics

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