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Cisco Conducting Forensic Analysis & Incident Response Using Cisco Technologies for CyberOps 認定 300-215 試験問題 (Q53-Q58):
質問 # 53
Refer to the exhibit.
What should an engineer determine from this Wireshark capture of suspicious network traffic?
- A. There are signs of SYN flood attack, and the engineer should increase the backlog and recycle the oldest half-open TCP connections.
- B. There are signs of ARP spoofing, and the engineer should use Static ARP entries and IP address-to- MAC address mappings as a countermeasure.
- C. There are signs of a DNS attack, and the engineer should hide the BIND version and restrict zone transfers as a countermeasure.
- D. There are signs of a malformed packet attack, and the engineer should limit the packet size and set a threshold of bytes as a countermeasure.
正解：A
解説：
In the provided Wireshark capture, we see multiple TCP SYN packets being sent from different source IP addresses to the same destination IP address(192.168.1.159:80)within a short time window. These SYN packets do not show a corresponding SYN-ACK or ACK response, indicating that these TCP connection requests are not being completed.
This pattern is indicative of aSYN flood attack, a type of Denial of Service (DoS) attack. In this attack, a malicious actor floods the target system with a high volume of TCP SYN requests, leaving the target's TCP connection queue (backlog) filled with half-open connections. This can exhaust system resources, causing legitimate connection requests to be denied or delayed.
Thecountermeasurefor this scenario, as highlighted in theCyberOps Technologies (CBRFIR) 300-215 study guideunderNetwork-Based Attacks and TCP SYN Flood Attacks, involves:
* Increasing the backlog queue: This allows the server to hold more half-open connections.
* Recycling the oldest half-open connections: This ensures that legitimate connections have a chance to be established if the backlog fills up.
Reference:CyberOps Technologies (CBRFIR) 300-215 study guide, Chapter 5: Identifying Attack Methods, SYN Flood Attack section, page 146-148.
質問 # 54
Refer to the exhibit.
A network engineer is analyzing a Wireshark file to determine the HTTP request that caused the initial Ursnif banking Trojan binary to download. Which filter did the engineer apply to sort the Wireshark traffic logs?
- A. http.request.un matches
- B. tls.handshake.type ==1
- C. tcp.window_size ==0
- D. tcp.port eq 25
正解：B
質問 # 55
Refer to the exhibit.
The application x-dosexec with hash
691c65e4fb1d19f82465df1d34ad51aaeceba14a78167262dc7b2840a6a6aa87 is reported as malicious and labeled as "Trojan.Generic" by the threat intelligence tool. What is considered an indicator of compromise?
- A. process injection
- B. hooking
- C. modified registry
- D. data compression
正解：A
解説：
Comprehensive and Detailed Explanation:
The exhibit lists several behaviors under categories such as Remote Access, Stealer/Phishing, Persistence, and Evasive Marks. Notably, under "Persistence" it states:
* "Writes data to a remote process"
This behavior is indicative of "process injection," a technique where malware writes or injects malicious code into the address space of another process. This allows the malware to evade detection and run within the context of a legitimate process.
This matches the MITRE ATT&CK technique T1055 (Process Injection), which is also discussed in the Cisco CyberOps Associate guide under evasion and persistence tactics used by malware.
While modified registry and data compression are possible signs of malware, they are not explicitly referenced in the exhibit. The definitive indicator shown is related to process injection.
Therefore, the correct answer is: C. process injection.
質問 # 56
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?
- A. tunneling
- B. poisoning
- C. obfuscation
- D. encryption
正解：C
解説：
Reference:
#:~:text=Obfuscation%20of%20character%20strings%20is,data%20when%20the%20code%20executes.
質問 # 57
Which tool is used for reverse engineering malware?
- A. Ghidra
- B. NMAP
- C. SNORT
- D. Wireshark
正解：A
解説：
Ghidrais a free and open-source software reverse engineering (SRE) suite developed by the NSA. It includes disassembly, decompilation, and debugging tools specifically designed for analyzing malware and other compiled programs.
The Cisco CyberOps guide referencesGhidraas a top tool for reverse engineering binary files during malware analysis tasks, making it ideal for understanding malicious code behavior at a deeper level.
質問 # 58
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