Most Recent CompTIA CAS-005 Exam Dumps

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Understanding the Security Event:

HOST002 is the only device authorized for internet traffic. However, the SIEM logs show that VM002 is making network connections to web.corp.local.

This indicates unauthorized access, which could be a sign of lateral movement or network infection.

This is a red flag for potential malware, unauthorized software, or a compromised host.

Why Option D is Correct:

Unusual network traffic patterns are often an indicator of a compromised system.

VM002 should not be communicating externally, but it is.

This suggests a possible breach or malware infection attempting to communicate with a command-and-control (C2) server.

Why Other Options Are Incorrect:

A (Misconfiguration): While a misconfiguration could explain the unauthorized connections, the pattern of activity suggests something more malicious.

B (Security incident on HOST002): The issue is not with HOST002. The suspicious activity is from VM002.

C (False positives): The repeated pattern of unauthorized connections makes false positives unlikely.

CompTIA SecurityX CAS-005 Official Study Guide: Chapter on SIEM & Incident Analysis

MITRE ATT&CK Tactics: Lateral Movement & Network-based Attacks

Comprehensive and Detailed

Integrating IDS, firewall, and DLP to reduce response time requires orchestration and automation. Let's evaluate:

A . SOAR (Security Orchestration, Automation, and Response): SOAR integrates security tools, automates workflows, and speeds up incident response. It's the best fit for this scenario, as CAS-005 highlights SOAR for operational efficiency.

B . CWPP (Cloud Workload Protection Platform): Focused on securing cloud workloads, not integrating on-premises tools.

C . XCCDF (Extensible Configuration Checklist Description Format): A standard for compliance checklists, not a tool for integration or response.

D . CMDB (Configuration Management Database): Tracks assets but doesn't automate or integrate security responses.

User user-c is showing anomalous behavior across multiple machines, attempting to run administrative tools such as cmd.exe and appwiz.CPL, which are commonly used by attackers for system modification. The activity pattern suggests a lateral movement attempt, potentially indicating a compromised account.

user-a (A) and user-b (B) attempted to run applications but only on one machine, suggesting less likelihood of compromise.

user-d (D) was blocked running cmd.com, but user-c's pattern is more consistent with an attack technique.

The best action to address the requirement of accessing the historian server within a SCADA system is to isolate the historian server for connections only from the SCADA environment. Here's why:

Security and Isolation: Isolating the historian server ensures that only authorized devices within the SCADA environment can connect to it. This minimizes the attack surface and protects sensitive data from unauthorized access.

Access Control: By restricting access to the historian server to only SCADA devices, the organization can better control and monitor interactions, ensuring that only legitimate queries and data retrievals occur.

Best Practices for Critical Infrastructure: Following the principle of least privilege, isolating critical components like the historian server is a standard practice in securing SCADA systems, reducing the risk of cyberattacks.

CompTIA Security+ SY0-601 Study Guide by Mike Chapple and David Seidl

NIST Special Publication 800-82: Guide to Industrial Control Systems (ICS) Security

ISA/IEC 62443 Standards: Security for Industrial Automation and Control Systems

The logs reviewed for the user indicate that access is being denied due to time-based access restrictions. These restrictions are commonly implemented to limit access to systems during specific hours to enhance security. If a user attempts to authenticate outside of the allowed time window, access will be denied. This measure helps prevent unauthorized access during non-business hours, reducing the risk of security incidents.

CompTIA SecurityX Study Guide: Covers various access control methods, including time-based restrictions, as a means of enhancing security.

NIST Special Publication 800-53, 'Security and Privacy Controls for Information Systems and Organizations': Recommends the use of time-based access restrictions as part of access control policies.

'Access Control and Identity Management' by Mike Chapple and Aaron French: Discusses the implementation and benefits of time-based access restrictions.