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| Section | Weight | Objectives |
|---|---|---|
| Incident Response Techniques | 25% | - Detect incidents
|
| Forensics Processes | 15% | - Follow forensic investigation methodology
|
| Forensics Techniques | 20% | - Apply forensic tools
|
| Incident Response Processes | 20% | - Implement proactive threat hunting
|
| Fundamentals | 20% | - Explain legal and regulatory considerations
|
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問題 #128
Refer to the exhibit.
A security analyst is reviewing alerts from the SIEM system that was just implemented and notices a possible indication of an attack because the SSHD system just went live and there should be nobody using it. Which action should the analyst take to respond to the alert?
答案：D
解題說明：
The log entry shows a failed SSH login attempt for an invalid user "admin" from IP 192.168.1.100. As the system has just gone live and no legitimate use is expected, this could be an early reconnaissance or brute- force attempt. However, blocking IPs or resetting passwords without fully understanding the context could lead to incomplete remediation or false positives.
According to Cisco CyberOps best practices, the first step is to thoroughly investigate the alert by correlating it with other logs (e.g., authentication logs, IDS/IPS logs) to determine the intent and scope of activity.
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問題 #129
An enterprise security analyst is investigating a potential breach. Internal logs show repeated login failures from an internal IP address, followed by a successful login during the early morning when no staff should be active. External threat intelligence associates the IP range with a known malicious actor. Which action correctly interprets the threat-intelligence data and determines IOCs and IOAs?
答案：B
解題說明：
Option C correlates the external intelligence with the observed authentication sequence and then tests what the account did after access. The IP-range match is an IOC because it connects the session to infrastructure associated with a malicious actor. Repeated failures, an off-hours success, and subsequent account behavior can form IOAs by showing credential guessing, account compromise, discovery, privilege misuse, or lateral movement. Internal logs should not be evaluated in isolation when relevant external intelligence is available.
A successful login after repeated failures increases rather than removes suspicion, and merely waiting for more attempts risks allowing an active compromise to continue. CBRFIR Incident Response Techniques objectives 3.2 and 3.9 require responders to correlate host and network data and interpret internal and external threat-intelligence feeds to determine IOCs and IOAs. The selected action performs both requirements directly. Cisco CBRFIR v1.2 exam topics
問題 #130
A threat actor attempts to avoid detection by turning data into a code that shifts numbers to the right four times. Which anti-forensics technique is being used?
答案：C
解題說明：
This scenario describes asubstitution cipher, where data is made unreadable or less recognizable without altering its functionality. According to the Cisco CyberOps Associate guide, obfuscation includes techniques such as shifting, encoding, and symbol manipulation to mask the true nature of data or code:
"A very well-known cipher, the Caesar cipher... shifts the letter of the alphabet by a fixed number... This technique is a form of data obfuscation used to bypass detection mechanisms.".
問題 #131
A company's IIS web server is breached, and the attacker accesses a Microsoft Windows Server 2016 host by exploiting an SMB vulnerability on the same subnet. The intruder shuts down critical services on the Windows server. A security engineer must retrieve the IIS logs from the web server and service-related logs from the Windows server. Which two actions accomplish this task? (Choose two.)
答案：A,E
解題說明：
IIS stores website access logs by default under %SystemDrive%\inetpub\logs\LogFiles, so copying those files preserves requests, client addresses, status codes, and timestamps relevant to the web-server compromise.
Windows service start, stop, failure, and configuration events are written by the Service Control Manager to the System log; exporting those filtered events from the affected Windows server directly addresses the attacker's shutdown of critical services. The Security log may contain authentication or object-access evidence, but it is not the specified source for Service Control Manager events. C:\Windows\Temp\Logs is not the standard IIS logging directory, and the service evidence belongs to the affected Windows server, not the IIS server's Security log. This maps to CBRFIR Forensics Techniques objective 2.2: identify required forensic files and their host locations. Microsoft IIS logging Microsoft Event Viewer overview
問題 #132
Refer to the exhibit.
Which two actions should be taken as a result of this information? (Choose two.)
答案：C,D
解題說明：
Comprehensive and Detailed Explanation:
The exhibit contains STIX (Structured Threat Information Expression) formatted threat intelligence indicating:
A phishing indicator related to the domain: apponline-8473.xyz
Associated malicious IP addresses: 164.90.168.78 and 199.19.224.83
Labelled as " malicious-activity " with " xfe-threat-score-10 "
Based on this:
Option B is correct: The IP addresses explicitly listed in the pattern field should be blacklisted to prevent command-and-control or malicious connections.
Option C is correct: The domain apponline-8473.xyz is also listed and flagged as involved in phishing, so DNS and firewall rules should block access to and from this domain.
Options A and E are too broad or speculative; the data specifies a specific domain, not a generic block on all emails or URLs. Option D refers to a label used for classification and not a directly actionable item.
Therefore, the correct answers are: B and C.
問題 #133
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