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18. Frage
During the course of normal SOC operations, three anomalous events occurred and were flagged as potential IoCs. Evidence for each of these potential IoCs is provided.
INSTRUCTIONS
Review each of the events and select the appropriate analysis and remediation options for each IoC.
Antwort:
Begründung:
See the complete solution below in Explanation:
Explanation:
Analysis and Remediation Options for Each IoC:
IoC 1:
Evidence:
Source: Apache_httpd
Type: DNSQ
Dest: @10.1.1.1:53,@10.1.2.5
Data: update.s.domain, CNAME 3a129sk219r9slmfkzzz000.s.domain, 108.158.253.253 Analysis:
Analysis: The service is attempting to resolve a malicious domain.
Reason: The DNS queries and the nature of the CNAME resolution indicate that the service is trying to resolve potentially harmful domains, which is a common tactic used by malware to connect to command-and- control servers.
Remediation:
Remediation: Implement a blocklist for known malicious ports.
Reason: Blocking known malicious domains at the DNS level prevents the resolution of harmful domains, thereby protecting the network from potential connections to malicious servers.
IoC 2:
Evidence:
Src: 10.0.5.5
Dst: 10.1.2.1, 10.1.2.2, 10.1.2.3, 10.1.2.4, 10.1.2.5
Proto: IP_ICMP
Data: ECHO
Action: Drop
Analysis:
Analysis: Someone is footprinting a network subnet.
Reason: The repeated ICMP ECHO requests to different addresses within a subnet indicate that someone is scanning the network to discover active hosts, a common reconnaissance technique used by attackers.
Remediation:
Remediation: Block ping requests across the WAN interface.
Reason: Blocking ICMP ECHO requests on the WAN interface can prevent attackers from using ping sweeps to gather information about the network topology and active devices.
IoC 3:
Evidence:
Proxylog:
GET /announce?info_hash=%01dff%27f%21%10%c5%wp%4e%1d%6f%63%3c%49%6d&peer_id%3dxJFS Uploaded=0&downloaded=0&left=3767869&compact=1&ip=10.5.1.26&event=started User-Agent: RAZA 2.1.0.0 Host: localhost Connection: Keep-Alive HTTP200 OK Analysis:
Analysis: An employee is using P2P services to download files.
Reason: The HTTP GET request with parameters related to a BitTorrent client indicates that the employee is using peer-to-peer (P2P) services, which can lead to unauthorized data transfer and potential security risks.
Remediation:
Remediation: Enforce endpoint controls on third-party software installations.
Reason: By enforcing strict endpoint controls, you can prevent the installation and use of unauthorized software, such as P2P clients, thereby mitigating the risk of data leaks and other security threats associated with such applications.
References:
CompTIA Security+ Study Guide: This guide offers detailed explanations on identifying and mitigating various types of Indicators of Compromise (IoCs) and the corresponding analysis and remediation strategies.
CompTIA Security+ Exam Objectives: These objectives cover key concepts in network security monitoring and incident response, providing guidelines on how to handle different types of security events.
Security Operations Center (SOC) Best Practices: This resource outlines effective strategies for analyzing and responding to anomalous events within a SOC, including the use of blocklists, endpoint controls, and network configuration changes.
By accurately analyzing the nature of each IoC and applying the appropriate remediation measures, the organization can effectively mitigate potential security threats and maintain a robust security posture.
19. Frage
A security analyst is reviewing the following authentication logs:
Which of the following should the analyst do first?
Antwort: C
Begründung:
Based on the provided authentication logs, we observe that User1's account experienced multiple failed login attempts within a very short time span (at 8:01:23 AM on 12/15). This pattern indicates a potential brute-force attack or an attempt to gain unauthorized access. Here's a breakdown of why disabling User1's account is the appropriate first step:
Failed Login Attempts: The logs show that User1 had four consecutive failed login attempts:
VM01 at 8:01:23 AM
VM08 at 8:01:23 AM
VM01 at 8:01:23 AM
VM08 at 8:01:23 AM
Security Protocols and Best Practices: According to CompTIA Security+ guidelines, multiple failed login attempts within a short timeframe should trigger an immediate response to preventfurther potential unauthorized access attempts. This typically involves temporarily disabling the account to stop ongoing brute- force attacks.
Account Lockout Policy: Implementing an account lockout policy is a standard practice to thwart brute-force attacks. Disabling User1's account will align with these best practices and prevent further failed attempts, which might lead to successful unauthorized access if not addressed.
20. Frage
A company needs to define a new road map for improving secure coding practices in the software development life cycle and implementing better security standards. Which of the following is the best way for the company to achieve this goal?
Antwort: C
Begründung:
Performing a Software Assurance Maturity Model (SAMM) assessment provides a structured way to evaluate current secure software practices and generate a tailored improvement road map. It aligns well with the goal of enhancing secure coding practices and implementing better security standards across the SDLC.
21. Frage
A company wants to use a process to embed a sign of ownership covertly inside a proprietary document without adding any identifying attributes. Which of the following would be best to use as part of the process to support copyright protections of the document?
Antwort: C
Begründung:
Steganography involves embedding information covertly within another file, such as a document, in a way that is not immediately apparent to the viewer. This can be used to embed a "sign of ownership" in a proprietary document without adding any visible or overt identifying attributes. It helps protect copyright by embedding hidden, identifying information that can later be used for verification or proof of ownership.
22. Frage
Which of the following best describes the challenges associated with widespread adoption of homomorphic encryption techniques?
Antwort: A
Begründung:
Homomorphic encryption allows computations to be performed on encrypted data without decrypting it, providing strong privacy guarantees. However, the adoption of homomorphic encryption is challenging due to several factors:
Insufficient coprocessor support: The computational overhead of homomorphic encryption is significant, requiring substantial processing power. Current general-purpose processors are not optimized for the intensive computations required by homomorphic encryption, limiting its practical deployment. Specialized hardware or coprocessors designed to handle these computations more efficiently are not yet widely available.
23. Frage
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