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The security team detects an alert regarding a potentially malicious file namedFinancial_Data_526280622.pdfdownloaded by a user. Upon reviewing SIEM logs and Cisco Secure Endpoint, the team confirms that the file was obtained from an untrusted website. The hash analysis of the file returns an unknown status. Which action must be done next?
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A
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Explanation
The correct next action is tosubmit the file for sandboxing. In professional security operations and threat hunting workflows, sandboxing is the most appropriate step when a file originates from an untrusted source and hash-based reputation checks return anunknownresult. An unknown hash means the file has not yet been classified as benign or malicious by threat intelligence databases, which is common with newly created malware or targeted attacks. Sandboxing allows the security team to performdynamic analysisby executing the file in an isolated, controlled environment. This process observes runtime behaviors such as process creation, registry modification, network communications, command-and-control callbacks, file system changes, and exploit attempts. These behaviors provide high-fidelity indicators that static analysis or hash lookups cannot reveal. Option B, reviewing the directory path, is useful for contextual awareness but does not determine whether the file is malicious. Option C, running a full malware scan, is premature; modern malware often evades signature-based scans, especially when the file is previously unknown. Option D, investigating the reputation of the website, is a supporting activity but does not assess the actual behavior or payload of the downloaded file. From a threat hunting and incident response standpoint, sandboxing bridges the gap betweendetection and confirmation. If the sandbox analysis confirms malicious behavior, the team can escalate to containment actions such as isolating the endpoint, blocking hashes and domains, and performing scope analysis to identify other affected systems. Additionally, sandbox results can be used to create new SIEM detections and EDR behavioral rules, strengthening future defenses. This approach aligns with professional best practices:unknown file + untrusted source = dynamic analysis first. It ensures accurate classification while minimizing unnecessary disruption to the user or environment. |
During a structured hunt, analysts using Cisco SIEM tools complete hypothesis testing and confirm malicious activity. What is the NEXT step in the Cisco threat hunting lifecycle?
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B
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Explanation
The correct answer isdocument findings and operationalize detections. In Cisco’s threat hunting methodology, confirmation of malicious activity isnot the end of the hunt. The most critical next step is to: Document attacker behavior Identify detection gaps Create or improve SIEM, EDR, or NDR detection rules This ensures the organization does not repeatedly rediscover the same threat. Options C and D are incident response and communication activities, not threat hunting lifecycle steps. Option A skips the crucial improvement phase. TheCBRTHD blueprintstrongly emphasizes: Continuous improvement Feedback loops Detection engineering By operationalizing findings, the SOC increases maturity and forces adversaries to change tactics. Therefore,Option Bis correct. |
Refer to the exhibit.
A security team detects a spike in traffic from the company web server. After further investigation, the team discovered that multiple connections have been established from the server to different IP addresses, but the web server logs contain both expected traffic and DDoS traffic. Which attribute must the team use to further filter the logs?
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A
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Explanation
The correct answer isConnection status. In this scenario, the key challenge for the security team is differentiatinglegitimate outbound trafficfrommalicious or DDoS-related trafficoriginating from the same web server. Since both types of traffic coexist in the logs, analysts must rely on an attribute that meaningfully distinguishes normal behavior from abnormal patterns. The exhibit shows numerous TCP connections from the web server to many different external IP addresses, with varyingTCP statessuch as ESTABLISHED, TIME_WAIT, and FIN_WAIT. These connection states are highly valuable for threat hunting and network analysis. During DDoS activity—especially reflected or amplification-style attacks, or when a server is abused as part of an attack—connections often remain half-open, rapidly transition to TIME_WAIT, or fail to fully establish. In contrast, legitimate web traffic typically results in stable, short-lived ESTABLISHED sessions that follow predictable patterns. Option B (destination port) is not useful here because most web traffic—both legitimate and malicious—commonly uses ports 80 or 443. Option C (IP address of the web server) provides no filtering value because all traffic already originates from that server. Option D (protocol) is also ineffective, as both normal and DDoS traffic in this case use TCP. From a professional SOC and threat hunting standpoint,connection state analysisis a foundational technique for detecting volumetric attacks, beaconing behavior, and abnormal session churn. By filtering logs based on connection status, analysts can quickly isolate suspicious patterns such as excessive short-lived connections, abnormal teardown behavior, or asymmetric session states that are characteristic of DDoS-related activity. This approach aligns with mature threat hunting practices:when indicators overlap, pivot to behavioral attributes. Connection status provides the necessary behavioral signal to separate expected traffic from attack traffic and supports faster, more accurate incident response. |
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Find answers to the most common questions about the Cisco 300-220 exam, including what it is, how to prepare, and how it can boost your career.
The Cisco 300-220 certification is a globally-acknowledged credential that is awarded to candidates who pass this certification exam by obtaining the required passing score. This credential attests and validates the candidates' knowledge and hands-on skills in domains covered in the Cisco 300-220 certification syllabus. The Cisco 300-220 certified professionals with their verified proficiency and expertise are trusted and welcomed by hiring managers all over the world to perform leading roles in organizations. The success in Cisco 300-220 certification exam can be ensured only with a combination of clear knowledge on all exam domains and securing the required practical training. Like any other credential, Cisco 300-220 certification may require periodic renewal to stay current with new innovations in the concerned domains.