300-215 Exam Dumps : Conducting Forensic Analysis and Incident Response Using Cisco CyberOps Technologies (CBRFIR)

The first and most important step in forensic analysis is to preserve the integrity of the data. According to best practices outlined in the Cisco CyberOps Associate guide and NIST 800-86, forensic investigators must first produce a forensically sound, bit-by-bit copy of the system’s data (i.e., imaging). This enables analysis to occur without altering the original evidence, which is essential for legal admissibility and maintaining the chain of custody.

Dynamic malware analysis involves executing the malware in a controlled environment to observe its behavior, such as file creation, network traffic, or system modifications. A sandbox is designed for this purpose—it safely executes and monitors suspicious code without risking the host system. The other tools (Decompiler, Unpacker, Disassembler) are primarily used in static analysis.

Correct answer: D. Sandbox

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From the Wireshark capture:

A (iraniansk.com): This domain is not a known legitimate resource and is hosting a suspicious file named “Fy.exe,” strongly indicative of a malware distribution domain.

D (Fy.exe): The Content-Disposition: attachment; filename="Fy.exe" header explicitly signals a binary executable download, a key indicator in Emotet campaigns.

While Content-Type: application/octet-stream (E) is typical of binary data transfers, it is not unique to malware and cannot by itself serve as a strong IoC. The nginx server (B) and cookie/hash string (C) similarly do not uniquely indicate compromise.