Free Cisco 300-215 Practice Exam with Questions & Answers | Set: 4

The Cisco Secure Firewall Threat Defense (Firepower) includes advanced capabilities such as intrusion prevention, URL filtering, and deep packet inspection. According to the CyberOps guide, it can detect and block C2 communications by analyzing traffic patterns and comparing them to threat intelligence data. The guide specifically states: "Advanced solutions such as Firepower provide detection capabilities for command and control (C2) traffic by identifying unusual outbound connections and behavioral anomalies".

The exhibit shows a series of process executions that form a suspicious chain involving scripting engines and obfuscated commands:

One critical indicator is cmd.exe executing PowerShell with obfuscated (Base64-encoded) arguments. The use of Base64 is a known method used by attackers to mask malicious commands. This aligns with attack techniques defined under MITRE ATT&CK T1059 (Command and Scripting Interpreter) and T1086 (PowerShell abuse). Therefore, option D is valid.

Another important IOC is WScript.exe acting as a parent of cmd.exe, which is abnormal in typical business environments. This indicates potential misuse of Windows Script Host (WSH) to launch commands, often seen in phishing or malware dropper scenarios. Thus, option E is also valid.

Options A and B by themselves are not definitive IOCs—PowerShell and cmd.exe are legitimate administrative tools and frequently used in Windows environments.

Option C is not supported by the exhibit—the reverse (powershell.exe initiated by WScript.exe) is what's seen, not the other way around.

These patterns align with the CyberOps Technologies (CBRFIR) 300-215 study guide, which specifies that chaining of interpreters (e.g., WScript → cmd → PowerShell) with encoded commands is a key indicator of compromise during forensic analysis.

The metadata in the exhibit reveals a strong indicator that this .LNK file (shortcut) is malicious:

The shortcut file is named "ds7002.pdf" but actually points to the execution of PowerShell:→ Full path: C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe

Arguments include:→ -noni -ep bypass $z = '...'; indicating an attempt to run a PowerShell script with execution policy bypassed (a known tactic for fileless malware delivery).

The file is masked as a PDF (common social engineering technique), and PowerShell execution via .LNK is a signature technique used by many malware families to initiate second-stage payloads or scripts.

Given this, the correct and safest course of action is to:

→ Open the .LNK file in a sandbox environment (D).

This enables safe behavioral analysis to observe what actions it attempts upon execution without endangering live systems.

Other options are inappropriate:

A (ignoring the threat due to extension) is dangerous — .LNKs can trigger code.

B (upload to virus engine) is only helpful for known malware and lacks behavioral context.

C (quarantine) is preventive but not investigative — sandboxing provides visibility.

The STIX intelligence feed in the exhibit identifies specific malicious domains, such as:

fightcovid19.shop

nocovid19.shop

stopcovid19.shop

These are categorized as “Malicious FQDN Indicator.” The recommended cybersecurity actions when such threat intelligence is received are:

D. Block network access to identified domains: This directly prevents users or systems from communicating with known malicious infrastructure and is a critical first step in threat mitigation.

B. Add a SIEM rule to alert on connections to identified domains: This ensures that any attempted communication with these domains is flagged for immediate review and action, enabling real-time threat detection and incident response.

Blocking all .shop domains (Option A or C) would be overbroad and potentially disruptive, as many legitimate websites also use that TLD. Option E (routing to block hole) could be valid as a DNS strategy, but B and D represent the most actionable and precise responses per standard incident response practices.

Generic Routing Encapsulation (GRE) is a tunneling protocol used to encapsulate a wide variety of network layer protocols inside point-to-point connections. If packets encapsulated with GRE are bypassing monitoring tools, it's likely due to tunneling—where payloads are hidden within another protocol. Tunneling can obscure malicious content or lateral movement in a network and is a common method used in data exfiltration.

Comprehensive and Detailed Explanation:

Endpoint Detection and Response (EDR) tools provide behavioral analytics and continuous monitoring to detect malware such as backdoors, which is especially critical on endpoints like macOS devices. These tools are essential to detect post-compromise activities and contain threats before they spread.

Secure Email Gateway (e.g., Cisco ESA) plays a key role in blocking phishing emails—the initial vector in this attack. It uses filters and reputation analysis to prevent malicious links or attachments from reaching end users.

Incorrect Options:

C. DLP focuses on preventing data exfiltration, not phishing prevention or backdoor detection.

D. IPS is effective for known signature-based threats but less effective against phishing links and endpoint-level backdoors.

E. WAF protects web servers, not end-user devices from phishing or backdoor infections.

Therefore, the correct answers are: A and B.

In highly sensitive environments such as secure government networks, the presence of anomalous DLL injection, beaconing to known interception points, and signs of encrypted data exfiltration constitutes a critical incident. The appropriate response in such classified contexts involves:

Invoking a pre-established, classified incident response protocol,

Immediately notifying national cyber defense operatives (such as national CERT or military cyber command),

Prioritizing containment to stop lateral spread,

Proceeding with eradication of malware or backdoors.

This response sequence aligns with the high-severity, immediate-response model described in the Cisco CyberOps Associate v1.2 curriculum under national defense and classified incident frameworks. The study guide emphasizes the importance of stakeholder communication and multi-agency coordination during advanced persistent threat (APT) intrusions involving critical infrastructure or defense systems.

Comprehensive and Detailed Explanation:

From the exhibit, Cisco Secure Malware Analytics (formerly Threat Grid) has captured outbound HTTP POST communication to the IP address 51.38.124.206 on port 80. This destination is highlighted in the analysis under “Outbound HTTP POST Communications,” indicating exfiltration behavior or command-and-control (C2) signaling.

Key indicators:

The report shows that binary data was POSTed to this IP.

The source system generated 22 packets and sent 6,192 bytes.

The system has flagged the behavior with a severity of 25 and confidence of 25—suggesting that this is an IoC worth acting on.

Therefore, the artifacts suggest that the destination IP 51.38.124.206 is involved in malicious activity, and the correct answer is:

Answer: A. Destination IP 51.38.124.206 is identified as malicious.