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NEW QUESTION # 81
A company has a web-based application that runs behind an Application Load Balancer (ALB). The application is experiencing a credential stuffing attack that is producing many failed login attempts. The attack is coming from many IP addresses. The login attempts are using a user agent string of a known mobile device emulator. A security engineer needs to implement a solution to mitigate the credential stuffing attack.
The solution must still allow legitimate logins to the application.
Which solution will meet these requirements?
Answer: C
Explanation:
A credential stuffing attack at the ALB is aLayer 7problem and is best mitigated withAWS WAF. The attacker is distributed across many IPs, so blocking by IP in a security group (Option B) is ineffective and operationally heavy. A CloudWatch alarm (Option A) only alerts; it does not block or mitigate requests.
Because the malicious traffic uses a distinctive, knownUser-Agentstring associated with a mobile device emulator, AWS WAF can quickly reduce the attack by inspecting the User-Agent header and blocking matching requests. This approach is targeted: it blocks the identified automated attack pattern while allowing legitimate users who do not present that emulator User-Agent to continue logging in. The WAF rule can be deployed immediately on the existing ALB-associated web ACL and can be further refined (for example, applied only to /login paths, combined with rate-based rules, or integrated with Bot Control) to minimize false positives.
Option D is risky because "allow only legitimate user agents" is brittle: user agents are diverse and change frequently, and a strict allow-list can accidentally block real users. Therefore, a WAF custom block rule for the known malicious User-Agent string is the correct solution.
NEW QUESTION # 82
A company is investigating actions that an IAM role performed. The company must find out when the role last accessed AWS Security Hub and when the role last used the DeleteInsight action in Security Hub. Which solution will provide this information?
Answer: D
Explanation:
The Access Advisor feature in IAM provides information about the services that an IAM role or user has accessed and the last time they accessed each service. This feature shows when the IAM role last accessed AWS Security Hub. To find specific actions like DeleteInsight, you can review CloudTrail logs, but Access Advisor is the first step to quickly see the last access to the service.
NEW QUESTION # 83
A company is using AWS CloudTrail and Amazon CloudWatch to monitor resources in an AWS account. The company's developers have been using an IAM role in the account for the last 3 months.
A security engineer needs to refine the customer managed IAM policy attached to the role to ensure that the role provides least privilege access.
Which solution will meet this requirement with the LEAST effort?
Answer: A
Explanation:
AWS IAM Access Analyzer policy generation is specifically designed to help security engineers generate least-privilege IAM policies based on actual usage recorded in AWS CloudTrail.
According to the AWS Certified Security - Specialty documentation, policy generation analyzes historical CloudTrail data to identify the exact API actions and resources that a role has accessed over a specified time period.
Because the role has been actively used for three months, there is sufficient CloudTrail data for IAM Access Analyzer to generate a refined customer managed policy automatically. This significantly reduces manual effort and eliminates the need to analyze logs or infer permissions.
The generated policy can be reviewed and attached directly to the role, ensuring least privilege access with minimal engineering effort.
Option B only validates existing policies for security warnings and does not reduce permissions.
Option C requires manual analysis of CloudWatch logs, which is time-consuming and error-prone.
Option D does not analyze real usage and cannot generate role-specific least privilege policies.
AWS documentation explicitly recommends IAM Access Analyzer policy generation as the fastest and most accurate method to refine IAM permissions based on observed behavior.
NEW QUESTION # 84
A company begins to use AWS WAF after experiencing an increase in traffic to the company's public web applications. A security engineer needs to determine if the increase in traffic is because of application-layer attacks. The security engineer needs a solution to analyze AWS WAF traffic.
Which solution will meet this requirement?
Answer: C
Explanation:
AWS WAF supportsWAF loggingas a dedicated feature that can deliver logs to destinations such as Amazon S3 (commonly via Kinesis Data Firehose). These logs contain rich request details (rule matches, action taken, headers, URI, source IP, etc.) that are essential for determining whether traffic spikes are due to application-layer attacks. For analysis with low operational overhead, storing logs inS3and querying them withAmazon Athenais a standard pattern.
Usingpartition projectionfurther reduces administrative work by avoiding manual partition management and enabling efficient queries over time-based prefixes.
NEW QUESTION # 85
A company's security engineer receives an abuse notification from AWS. The notification indicates that someone is hosting malware from the company's AWS account. After investigation, the security engineer finds a new Amazon S3 bucket that an IAM user created without authorization.
Which combination of steps should the security engineer take toMINIMIZE the consequencesof this compromise? (Select THREE.)
Answer: A,D,E
Explanation:
AWS incident response best practices emphasizerapid containment, credential revocation, and threat detectionto minimize the blast radius of a compromise. According to the AWS Certified Security - Specialty Official Study Guide, when unauthorized resources such as an Amazon S3 bucket hosting malware are discovered, immediate action must be taken to stop further misuse of the account and to prevent recurrence.
Rotating or deleting all AWS access keys (Option D)is a critical containment step. If an IAM user has been compromised, any long-term credentials associated with that user must be revoked immediately to prevent continued unauthorized access. AWS guidance explicitly lists access key rotation or deletion as a first- response action for suspected credential compromise.
Deleting unrecognized or unauthorized resources (Option F)directly removes the malicious infrastructure that is being abused. In this case, deleting the unauthorized S3 bucket immediately stops malware distribution and reduces reputational and compliance impact.
Turning on Amazon GuardDuty (Option B)enables continuous threat detection by analyzing CloudTrail events, VPC Flow Logs, and DNS logs. GuardDuty can identify additional malicious activity, compromised credentials, or persistence mechanisms that the attacker may have established. AWS documentation recommends enabling GuardDuty during or immediately after an incident to detect ongoing or future threats.
Option A does not reduce the impact of the current compromise. Option C is overly disruptive and not recommended; credential rotation should be targeted. Option E is unnecessary because there is no indication that EBS-backed compute resources are involved.
AWS incident response guidance clearly prioritizescredential revocation, malicious resource removal, and threat detectionto minimize consequences.
* AWS Certified Security - Specialty Official Study Guide
* AWS Incident Response Best Practices
* Amazon GuardDuty User Guide
* AWS IAM Security Best Practices
NEW QUESTION # 86
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