300-215問題と解答、300-215模擬試験

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Cisco Conducting Forensic Analysis & Incident Response Using Cisco Technologies for CyberOps 認定 300-215 試験問題 (Q128-Q133):

質問 # 128
Refer to the exhibit.

Which type of code is being used?

A. Python
B. BASH
C. Shell
D. VBScript

正解：A

解説：
The code in the exhibit is written in Python. Here's how we can confirm:
* The function definition uses Python syntax: def function_name(args):
* It uses the b64encode and decode functions - typical of Python's base64 module.
* Data structures such as dictionaries are used with curly braces (e.g., form_data = {entry1: enc1, ...}).
* The conditional syntax uses "if r.status_code == 200:" which is Pythonic.
* The request object "r = post(...)" and use of headers show standard use of the Python requests library.
This type of script is typical in exfiltration scenarios where encoded information is sent via a web form (in this case Google Forms), bypassing detection systems.
Reference:CyberOps Technologies (CBRFIR) 300-215 study guide, Chapter on "Working with Malware and Exploit Scripts," which includes analysis of obfuscated and encoded scripts written in Python used for data exfiltration or C2 communication.

質問 # 129
Refer to the exhibit.

What does the exhibit indicate?

A. A UAC bypass is created by modifying user-accessible registry settings.
B. A scheduled task named "DelegateExecute" is created.
C. The new file is created under the Software\Classes disk folder.
D. The shell software is modified via PowerShell.

正解：A

解説：
The exhibit shows a PowerShell script that modifies registry keys under:
* HKCU:\Software\Classes\Folder\shell\open\command
This technique is commonly associated with aUAC (User Account Control) bypass. Specifically:
* It creates a new custom shell command path for opening folders.
* The key registry property"DelegateExecute"is set, which is a known bypass method. If set without a value, it may cause Windows to run commands with elevated privileges without showing the UAC prompt.
The use ofHKCU(HKEY_CURRENT_USER) rather thanHKLM(HKEY_LOCAL_MACHINE) allows the attacker to bypass permissions since HKCU is writable by the current user. This registry hijack can be leveraged by a malicious actor to execute arbitrary commands with elevated rights.
This is identified in the Cisco CyberOps study material under "UAC bypass techniques," which describes:
"Attackers often create or modify registry keys like DelegateExecute to hijack the default behavior of applications and elevate privileges".
Thus, option B is correct: the exhibit demonstrates a UAC bypass using user-accessible registry modification.

質問 # 130
Refer to the exhibit.

A company was acquired by a larger organization, and the IT security team was asked to evaluate its security architecture. The main server had been compromised by ransomware seven months earlier but was subsequently recovered and reimaged by an incident-response company. After identifying inconsistencies in the report, the team requested all available server logs, extracted using a forensic script. Which two DLL files shown in the ListDLLs output require further investigation? (Choose two.)

A. C:\Windows\System32\CRYPT32.dll
B. C:\Windows\Temp\samsrv.dll
C. C:\Windows\System32\bcrypt.dll
D. C:\Windows\System32\msvcrt.dll
E. C:\Windows\System32\lsasrv.dll

正解：B、D

解説：
ListDLLs identifies modules loaded into lsass.exe, including their full paths. Option E is the strongest anomaly: samsrv.dll is a sensitive Windows security component, and a copy loaded from C:\Windows\Temp rather than the protected system directory can indicate DLL replacement, side-loading, or injection. Option A is the second investigation target because the runtime module must be validated against the rebuilt server's trusted baseline, signature, version, and hash instead of being accepted solely by name. By contrast, bcrypt.
dll, CRYPT32.dll, and lsasrv.dll are expected Windows cryptographic and Local Security Authority components when loaded from System32. "Require investigation" does not itself prove that either file is malicious; validation is mandatory. Microsoft documents that ListDLLs reports loaded modules and can display version and digital-signature information or identify unsigned DLLs. This supports CBRFIR process and Sysinternals-based host analysis. Microsoft Sysinternals ListDLLs

質問 # 131
Refer to the exhibit.

Which encoding technique is represented by this HEX string?

A. Unicode
B. Charcode
C. Base64
D. Binary

正解：B

解説：
The hexadecimal representation in the exhibit does not match the Base64 encoding format, which uses ASCII characters (A-Z, a-z, 0-9, +, /) and often includes padding with =. This string is clearly hex and is more aligned with Charcode, where hexadecimal values represent individual characters based on ASCII values.
The Cisco CyberOps Associate guide refers to such encodings during forensic analysis and emphasizes identifying patterns in memory dumps, payloads, or logs. " Security professionals often decode hexadecimal strings to reveal ASCII representations, particularly when inspecting encoded payloads or character obfuscation techniques used in malware " .

質問 # 132
A company recently deployed a public web application that collects users' personal information and stores it in a database. The company is concerned that attackers could exploit application vulnerabilities to steal this information. Which approach should a security engineer recommend to identify attack vectors or attack surfaces and recommend mitigations?

A. Conduct a network penetration test to identify vulnerabilities and recommend mitigations.
B. Review the web application's source code to identify potential vulnerabilities and propose mitigations.
C. Perform a threat-modeling exercise to identify potential attack vectors and suggest mitigations.
D. Use a vulnerability scanner to identify potential vulnerabilities and advise on mitigations.

正解：C

解説：
Threat modeling is specifically designed to identify assets, trust boundaries, entry and exit points, attacker goals, plausible attack paths, and corresponding controls before or after deployment. For this application, the model would trace personal data from collection through processing and database storage, examine authentication and authorization boundaries, and evaluate threats such as injection, broken access control, credential abuse, and data exfiltration. The team can then rank risks and assign mitigations. This directly satisfies CBRFIR objective 3.3: determine attack vectors or attack surfaces and recommend mitigation. Source-code review, vulnerability scanning, and penetration testing are valuable validation activities, but each examines a narrower implementation or network view and does not, by itself, provide the requested systematic model of attack surfaces and controls. Therefore, D is the most complete answer. OWASP's threat-modeling guidance describes this structured, adversarial process.

質問 # 133
......

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