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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Fundamentals | 20% | - Antiforensic tactics, techniques, and procedures - Evidence collection in virtualized environments - YARA rules for malware identification and classification - Root cause analysis reporting components - Network infrastructure device forensics - Encoding and obfuscation techniques |
| Topic 2: Forensics Processes | 15% | - Evidence handling and chain of custody - Legal and compliance considerations - Data acquisition: memory, disk, network - Antiforensic techniques: debugging, geolocation, obfuscation |
| Topic 3: Forensics Techniques | 20% | - Host-based evidence location and collection - Script analysis (Python, PowerShell, Bash) for log processing - Forensic tools: Volatility, Sysinternals, SIFT, TCPdump - Identifying Indicators of Compromise (IOC) from tools output - MITRE ATT&CK framework for fileless malware analysis |
| Topic 4: Incident Response Techniques | 30% | - Attack vector analysis and mitigation recommendations - Cisco security solutions for detection and prevention - Response to zero-day exploits and vulnerabilities - Interpreting alerts from SIEM, IDS/IPS, syslog - Post-incident analysis and improvement actions - Threat intelligence interpretation: IOCs, IOAs, actor profiling - Correlating host and network activity data |
| Topic 5: Malware Analysis | 15% | - Malware classification and behavior analysis - Reverse engineering principles - Static and dynamic malware analysis - Malware family and campaign identification |
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問題 #117
Refer to the exhibit.
An alert came with a potentially suspicious activity from a machine in HR department. Which two IOCs should the security analyst flag? (Choose two.)
答案：A,E
解題說明：
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.
Reference: CyberOps Technologies (CBRFIR) 300-215 study guide, Chapter on Identifying Malicious Activity in Host-Based Artifacts and Command-Line Analysis.
問題 #118
An investigator is analyzing an attack in which malicious files were loaded on the network and were undetected. Several of the images received during the attack include repetitive patterns. Which anti- forensic technique was used?
答案：D
解題說明：
Explanation/Reference: https://doi.org/10.5120/1398-1887
https://www.carbonblack.com/blog/steganography-in-the-modern-attack-landscape/
問題 #119
Refer to the exhibit.
Which encoding technique is represented by this HEX string?
答案：D
問題 #120
Several previously unseen executable files are detected on an international bank's transaction servers after an overnight batch-processing update. The executables make covert outbound connections to a server in a jurisdiction known for harboring threat actors. Their creation time also coincides with a network-intrusion attempt that the SOC initially classified as unsuccessful. The IT engineer has collected the observations and available data. Which set of actions should occur next?
答案：B
解題說明：
After initial collection, the engineer should escalate the suspected compromise to the incident-response team and begin structured analysis. Comparing the new executables, timestamps, services, hashes, and configurations with trusted baselines helps determine what changed and whether the overnight update was abused. Investigating the intrusion attempt's source connects the allegedly unsuccessful event to the later files and outbound communications. Options A and D begin potentially disruptive containment before the authorized response team has assessed the transaction systems' criticality and selected a strategy. Option C adds external information sharing before the organization has validated scope and facts. NIST SP 800-61r3 states that incident handlers collect and analyze evidence, prioritize response, and investigate what happened, how, and why; it also requires escalation based on risk. This corresponds to CBRFIR incident analysis, correlation, and response-process objectives. NIST SP 800-61r3
問題 #121
Which type of record enables forensics analysts to identify fileless malware on Windows machines?
答案：B
解題說明：
Fileless malwareoperates in memory and often leverages legitimate tools such asPowerShellto avoid traditional file-based detection. Since these threats don't leave typical file traces, analysts must rely on PowerShell event logsto trace suspicious or unauthorized script execution.
The Cisco CyberOps Associate guide explicitly states:
"PowerShell logs provide insight into script block execution and can reveal indicators of fileless attacks that reside in memory." Hence,PowerShell event logsare the most effective forensic source for detecting fileless malware activity on Windows systems.
問題 #122
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