Cisco CyberOps Associate 200-201 (200-201) — Questions 151–225

Malfind detects injected code by scanning for VADs with specific protection flags. 'VadS' indicates a VAD with PAGE_EXECUTE_READWRITE protection, common for shellcode injection. 'Vadl' is for large pages. The presence of these tags strongly suggests code injection.

The User-Agent string 'Mozilla/5.0 compatible; MSIE 6.0; Windows NT 5.1' mimics Internet Explorer 6 on Windows XP (NT 5.1). Since the source host normally runs Windows 10, this outdated and mismatched User-Agent is a strong indicator of malware attempting to disguise its traffic as legacy browser activity to evade detection.

Avoidance means eliminating the risk by discontinuing the activity.

Mitigate means applying controls to reduce risk.

IPsec is a suite of protocols used to secure IP communications by authenticating and encrypting each IP packet in a data stream. It operates at the network layer (Layer 3) and is commonly used in VPNs to provide confidentiality, integrity, and authentication. This makes it a fundamental network security protocol.

Least privilege is a core principle of zero trust because it ensures users, devices, and applications are granted only the minimum permissions necessary to perform their functions. This limits the blast radius of a potential compromise by restricting lateral movement and access to sensitive resources. In zero trust, least privilege is enforced through granular policies, often using micro-segmentation and identity-based access controls, rather than relying on network location.

Phishing typically uses deceptive emails and fake websites to trick users into revealing sensitive information.

Cron is a standard Linux mechanism for scheduling recurring tasks, and malware often uses cron jobs to re-execute itself after a reboot or at specific intervals. The crontabs directory under /var/spool/cron/ contains the actual cron job files for each user, making it a primary location to check for unauthorized persistence entries. Malware can add a cron entry that downloads or runs a malicious script, ensuring its continued presence on the system.

Least privilege, is correct because the design restricts access to the sensitive database to only the specific application server that requires it. This principle dictates that users, processes, or systems should be granted the minimum permissions necessary to perform their functions, thereby reducing the attack surface. By implementing network access control lists (ACLs) or firewall rules that permit traffic solely from the application server's IP address to the database port, the engineer enforces least privilege at the network layer.

Legal counsel ensures compliance with data breach notification laws.

Port 3389 is the default port for Remote Desktop Protocol (RDP), which is used for remote graphical desktop access to Windows systems. The firewall rule denying traffic from 10.0.0.5 to this port blocks RDP connections, preventing that host from initiating remote desktop sessions.

In MITRE ATT&CK, the tactic 'Impact' covers actions that disrupt or damage systems, similar to 'Actions on Objectives' where the attacker achieves their goal.

Process Explorer provides detailed process tree view and command line information, unlike Task Manager's default view or tasklist.

Mitigate means implementing controls to reduce risk.

Establishing a feedback loop for continuous improvement (A) is a key element because security monitoring is not a static process; it requires iterative refinement based on lessons learned from incidents, false positives, and changes in the threat landscape. This loop ensures that detection rules, response playbooks, and monitoring configurations evolve to maintain effectiveness against new attack vectors and reduce noise over time.

The core issue is a synchronization problem between the employee's token and the authentication server. Two-factor authentication (2FA) relies on time-based one-time passwords (TOTP) or event-based (HOTP) algorithms; if the token's clock drifts or the counter becomes out of sync, authentication fails. Providing a new token and correctly synchronizing it (e.g., via NTP time alignment or reseeding the HMAC-based OTP counter) restores secure access without bypassing the security policy.

Maintaining a proper chain of custody documents who handled the evidence and ensures it has not been tampered with, which is critical for legal admissibility.

HTTP traffic is most prominent because the NetFlow data shows a high volume of packets and bytes on TCP port 80, which is the default port for HTTP. NetFlow records summarize traffic flows, and the large number of flows and bytes on port 80 indicates that HTTP is the dominant protocol in the captured data.

URLs are correct because they can indicate the destination of exfiltrated data, such as a cloud storage endpoint or a command-and-control server. File hashes (MD5/SHA-256) are correct because they uniquely identify the specific files being transferred, allowing the analyst to track known malicious or sensitive files across the network.

CISO decides on business impact; PR handles external communication.

The alert is triggered by a correlation rule that detects more than 30 failed authentication attempts from a single source IP within 10 minutes. The observed pattern—exactly 6 attempts per minute, every 5 seconds—is highly regular and mechanical, which is characteristic of an automated script or misconfigured process, not human behavior. Since the partner company locks accounts after 3 failed attempts, a human user would be locked out quickly and could not sustain 30+ attempts; only a script ignoring the lockout policy or using a cached incorrect password could produce this pattern.

Windows Security Event Logs with Event ID 4624 (successful logon) and 4625 (failed logon) are the authoritative source for interactive and remote logon events on a Windows system. They record the target user account (jsmith), the source IP address of the remote connection, and the timestamp, making them the direct and most reliable log source to determine if a specific user account was used from a remote IP during a breach window.

The syslog message indicates that an inbound UDP packet from an external source to an internal destination was denied by the Cisco ASA. The message includes the source and destination IP addresses and ports, and the action is 'denied' due to the access-group 'OUTSIDE_IN' applied to the outside interface. This matches option B, which correctly identifies the denied inbound UDP traffic.

Cisco Secure Network Analytics (formerly Stealthwatch) is the correct answer because it is a dedicated network visibility and security analytics platform that leverages NetFlow, IPFIX, and other telemetry sources to perform behavioral analysis and detect anomalies across the entire network. Unlike a firewall or switch, its primary function is to ingest flow data and apply machine learning models to identify threats such as lateral movement, data exfiltration, and command-and-control traffic.

The 'systemctl disable' command prevents a service from starting automatically at boot.

The script tag is classic XSS; HTML injection occurs when attacker injects HTML content.

Large outbound data transfers outside normal patterns, especially at odd hours, are typical of data exfiltration.

An incident response policy must include contact information for law enforcement to ensure timely reporting of crimes such as data breaches or ransomware attacks, as required by regulations like GDPR or state breach notification laws. This enables proper legal handling and chain-of-custody preservation. Option C is correct because a step-by-step procedure for containment, eradication, and recovery is the core operational framework of the NIST SP 800-61 incident response lifecycle, ensuring consistent and effective response actions.

In auth.log, failed SSH logins typically contain 'Failed password' messages. Accepted password indicates success, and Invalid user may accompany failed attempts but the key indicator is 'Failed password'.

Spear phishing targets a specific individual with personalized content, often impersonating a trusted source.

A false positive is an alert that triggers incorrectly when no real attack exists. True positive means attack confirmed, false negative means attack missed, true negative means no alert and no attack.

A vulnerability is a weakness in a system that can be exploited by a threat.

The exhibit shows a single intrusion event from a specific source IP to a destination IP. The most appropriate first step is to investigate the source host for compromise because the event indicates a potential exploit attempt originating from that host. Without additional context (e.g., multiple events, confirmed data exfiltration), escalating to law enforcement or blocking the IP is premature, and disabling the signature would blind the sensor to future threats.

Standard well-known port assignments: HTTP=80, HTTPS=443, SSH=22, DNS=53. Common confusions include swapping HTTP/HTTPS ports or confusing SSH with Telnet.

Normalization is the SIEM component that parses incoming log data from diverse sources (e.g., syslog, Windows Event Log, NetFlow) and maps the fields into a common, standardized schema. This process ensures that fields like source IP, destination IP, and timestamp are consistently named and formatted, enabling effective correlation and analysis across heterogeneous devices.

A risk assessment allows the security team to evaluate the actual risk of using AWS managed keys versus company-managed keys, and then present the trade-offs to management for a decision. Option B is too disruptive without management input; Option C prematurely accepts the configuration without analysis; Option D causes unnecessary business interruption.

The observed traffic—multiple connections from an internal host to a remote IP on TCP port 4444, with irregular timing and small payloads—is a classic signature of command-and-control (C2) beaconing. Attackers often use non-standard high ports like 4444 to evade detection, and the irregular intervals (jitter) are intentionally introduced to avoid pattern-based anomaly detection, while small payloads minimize data transfer and reduce the chance of triggering network thresholds.

A ransomware attack encrypts files and demands payment, directly preventing users from accessing their data and systems. This loss of access is a direct impact on Availability, which ensures that information and resources are accessible when needed. The CIA triad's Availability element is most immediately compromised because the organization cannot retrieve or use its encrypted files.

Signature-based detection (C) is a core technique in network intrusion analysis where predefined patterns (signatures) of known attacks—such as specific byte sequences in a packet payload or known malicious IP addresses—are matched against network traffic. This method is highly effective for detecting known threats with low false-positive rates, as it relies on exact pattern matching rather than behavioral baselines.

Exfiltration via FTP is a common technique to steal data by transferring it to an external server.

A legal hold is issued to preserve data relevant to litigation.

Unusual outbound network connections to unfamiliar IP addresses are a common indicator of compromise (IOC) because they often signal command-and-control (C2) communication, data exfiltration, or malware beaconing. Security monitoring systems analyze netflow or firewall logs to detect connections to IP addresses not in the organization's baseline or known threat intelligence feeds. This behavior deviates from normal traffic patterns and is a key trigger for alerts in SIEM or IDS/IPS systems.

A business-critical application that cannot function with a security policy control represents a legitimate operational need that may require a temporary exception. Security policies should support business objectives, and if a control (e.g., a firewall rule, an antivirus exclusion, or an application whitelisting policy) prevents a critical application from running, an exception can be granted after a risk assessment and compensating controls are implemented. This aligns with the principle of balancing security with business continuity.

The NIST Cybersecurity Framework is built around these five core functions.

The NIDS is generating false positives: the signature matches normal HTTP traffic to a fully patched web server. Disabling the signature for that specific IP address eliminates the noise without compromising security, as the server is not vulnerable to the exploit. This is a standard tuning action in intrusion detection to reduce alert fatigue while maintaining coverage for other hosts.

Firewall logs (B) are a primary source of security events because they record allowed and denied traffic based on access control lists (ACLs), providing critical data on attempted intrusions, policy violations, and reconnaissance scans. DNS query logs (E) are equally vital as they capture domain resolution requests, enabling detection of malware command-and-control (C2) communication, DNS tunneling, and connections to known malicious domains. Both are standard inputs for SIEM systems and security monitoring platforms.

The security engineer is gathering information from publicly available sources (LinkedIn, Google) without directly interacting with the target's systems. This is the definition of passive reconnaissance, which involves collecting data from open-source intelligence (OSINT) without sending any packets to the target network.

The log entry shows a successful HTTP 200 response to a POST request to a login page. While a single 200 is normal, it is the most suspicious observation among the options because it indicates a successful login, which could be part of a brute force or credential stuffing attack if many attempts preceded it. The correct answer is A.

The root cause is a failure in the security review process for third-party components. Even though the company uses parameterized queries elsewhere, the third-party search module concatenates user input directly into SQL queries, bypassing that protection. Establishing an SSDLC with mandatory security reviews for all third-party components ensures that such vulnerabilities are caught before integration, addressing the process gap rather than just the symptom.

Deploying a centralized collector with local storage and forwarding capabilities creates a buffer that ensures logs are not lost during SIEM unavailability. The collector receives logs from sources, stores them locally (e.g., on disk or in a queue), and forwards them to the SIEM when it becomes available again. This decouples log generation from SIEM ingestion, preventing data loss even during extended outages.

The cron job is defined in /etc/cron.d/ because this directory allows system administrators to drop individual cron configuration files that are parsed by the cron daemon. Unlike /etc/crontab and /var/spool/cron/ (which contain user-specific crontabs), /etc/cron.d/ is a standard location for package-maintained or custom cron jobs that run with system privileges. The fact that the analyst found nothing in the other two locations strongly suggests the job is defined in /etc/cron.d/.

A successful authentication event following multiple failed attempts is a key indicator of a brute-force or password-spraying attack. The analyst must correlate the failed attempts with the eventual success to identify that the attacker gained access after guessing or cracking the credentials.

ICMP tunneling encapsulates non-ICMP data (e.g., command-and-control traffic) within ICMP echo request/reply packets. The random payload data and larger-than-typical payload size are hallmarks of this technique, as the attacker uses the ICMP protocol to bypass firewalls and exfiltrate data or establish covert communication.

In Cisco's security policy framework, guidelines and standards are foundational components. Guidelines offer recommended practices and flexible advice for implementing security controls, while standards define mandatory, specific technical requirements (e.g., encryption algorithms, password complexity) that must be followed. Together, they provide the structure for consistent security enforcement across an organization.

True positive and false positive are standard alert classifications.

SSH (Secure Shell) encrypts all traffic, including authentication credentials and commands, between an administrator and a network device. This satisfies the policy requirement for encrypted administrative access, unlike Telnet which sends everything in plaintext.

The alert corresponds to a real attack (cross-site scripting) in the traffic, so it is a true positive.

A port scan uses TCP SYN packets to probe for open ports on a target host. Excessive SYN packets to multiple ports indicate a port scan.

Syslog messages (C) are a standard protocol for logging events from network devices, servers, and applications, making them a primary source of security monitoring data. NetFlow records (E) provide IP traffic flow statistics, enabling network behavior analysis and anomaly detection. Both are explicitly listed as valid data sources in Cisco's security monitoring architecture.

The TCP stream shows an HTTP GET request for a file named 'malware.exe', which indicates the client is downloading an executable from a server. This is characteristic of a Trojan download attack, where a user is tricked into downloading and executing malicious software, often disguised as a legitimate file. The use of Wireshark to capture the HTTP request confirms the network-level activity of a file transfer, aligning with the Trojan's delivery mechanism.

The first step in standard incident response procedures (as defined by NIST SP 800-61 and Cisco's IR framework) is to document the finding and escalate to the incident response team. This ensures that the potential policy violation is formally recorded and that trained responders can assess the risk, determine if sensitive data was exposed, and coordinate remediation without prematurely destroying evidence or causing operational disruption.

The syslog message indicates that a TCP connection attempt from an outside (lower-security) zone to an inside (higher-security) zone was denied by the ASA's implicit or explicit access control. By default, the Cisco ASA denies all inbound traffic from a lower security level to a higher security level unless explicitly permitted by an access-list applied to the interface. The message 'denied' confirms the packet was dropped, not allowed.

Pass-the-hash uses NTLM authentication with a hash, often over SMB, and may show successful authentication without password.

The Acceptable Use Policy (AUP) defines what activities and software are permitted on company devices. By installing an unapproved application without IT authorization, the employee violated the AUP, which directly led to the malware infection. This policy is the primary control for preventing unauthorized software installations that bypass security baselines.

Regular beaconing to an external IP on a high port (Option B) is a classic indicator of a persistent backdoor because the compromised host periodically initiates outbound connections to a command-and-control (C2) server, often using non-standard high ports (e.g., 4444, 8080, or 1337) to evade firewall rules. This behavior maintains a communication channel that allows the attacker to issue commands or exfiltrate data over time, even if the initial exploit vector is patched.

The CISO is the decision-maker for business impact and authorizes containment actions.

malfind scans for injected code by finding memory regions with suspicious permissions (e.g., RWX). dlllist lists loaded DLLs, and ldrmodules can find hidden or suspicious modules.

Windows Event Logs are a primary source of security monitoring data because they record critical security events such as logon attempts, account changes, and process creation (Event IDs 4624, 4625, 4688). Security Information and Event Management (SIEM) systems ingest these logs to detect unauthorized access, privilege escalation, and malware execution.

A self-signed TLS certificate is often used by attackers to encrypt exfiltrated data without the overhead of obtaining a legitimate certificate from a trusted CA. Legitimate services typically use certificates signed by a recognized CA, so a self-signed certificate in traffic to an external IP on port 443 is a strong indicator of malicious activity, especially when combined with large data transfers.

Incident response procedures typically require preserving volatile data before disconnecting the system. By pulling the network cable first, the first responder violated the evidence preservation steps, making option B the correct answer.

The log entry shows 'action=deny', which explicitly indicates the firewall blocked the packet. Since destination port 22 is the default port for SSH, this log entry represents an attempted SSH connection from 192.168.1.100 to 10.0.0.1 that was denied by the firewall. The analyst's knowledge that 10.0.0.1 is an SSH server confirms the nature of the traffic.

Communication with a known malicious IP address is a strong indicator of compromise because it directly suggests the host is interacting with a command-and-control (C2) server or a malware distribution point. Threat intelligence feeds and blocklists (e.g., AlienVault OTX, MISP) provide curated lists of known malicious IPs; matching traffic to these lists provides high-fidelity evidence of an active compromise.