Quick Answer
The correct next tool is UPX with the -d switch, because the PEiD detection of an entry point section named 'UPX0' and an entropy value of 7.8 are definitive indicators of UPX packing, where the high entropy signals compression or encryption of the original code. Using UPX -d performs a standard, reversible decompression that restores the original executable for static analysis without needing to execute the malware or reverse-engineer the unpacking stub. On the Computer Hacking Forensic Investigator CHFI exam, this question tests your ability to recognize common packer signatures and apply the appropriate unpacking tool, often appearing as a trap where candidates might mistakenly choose a debugger or disassembler like OllyDbg or IDA Pro for the initial unpacking step. Remember that UPX is unique among packers because it includes its own built-in decompression switch, making it the fastest and safest first move. Memory tip: "UPX0 in the section, UPX -d is your next direction."
This CHFI practice question tests your understanding of mobile and malware forensics. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A forensic investigator is analyzing a malware sample that appears to be packed. Using PEiD, the analyst detects an entropy value of 7.8 and the entry point section is named 'UPX0'. Which of the following tools should the analyst use NEXT to unpack the malware for static analysis?
UPX -d
The UPX tool with -d flag decompresses UPX-packed executables.
Ghidra
Why wrong: Ghidra is a disassembler/decompiler, not a dedicated unpacker for UPX.
Process Monitor
Why wrong: Process Monitor is for dynamic analysis, not unpacking.
IDA Pro
Why wrong: IDA Pro may automatically detect UPX but often requires manual unpacking; the UPX tool is more direct.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
UPX -d
The presence of 'UPX0' as the entry point section name and an entropy value of 7.8 (very high, indicating compression or encryption) strongly suggests the malware is packed with UPX (Ultimate Packer for eXecutables). The correct next step is to use UPX with the -d (decompress) switch to unpack the binary, restoring the original executable for static analysis. This is a standard, reversible unpacking method that does not require dynamic analysis or disassembly of the packed stub.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
UPX -d
Why this is correct
The UPX tool with -d flag decompresses UPX-packed executables.
Related concept
Read the scenario before looking for a memorised answer.
Ghidra
Why it's wrong here
Ghidra is a disassembler/decompiler, not a dedicated unpacker for UPX.
Process Monitor
Why it's wrong here
Process Monitor is for dynamic analysis, not unpacking.
IDA Pro
Why it's wrong here
IDA Pro may automatically detect UPX but often requires manual unpacking; the UPX tool is more direct.
Common exam traps
EC-Council often tests the distinction between tools for unpacking versus tools for analysis, expecting candidates to recognize that UPX -d is the direct unpacking utility, while Ghidra and IDA Pro are analysis tools that require an already-unpacked binary for effective static analysis.
Detailed technical explanation
UPX works by compressing the original PE sections (e.g., .text, .data) into a single section (often named UPX0, UPX1, or UPX2) and prepending a small decompression stub. When the packed executable runs, the stub decompresses the original code in memory. Using 'UPX -d' reverses this process by reading the compression parameters stored in the stub (e.g., the original section table and relocations) and reconstructing the PE file exactly as it was before packing. In real-world malware analysis, some samples use modified UPX variants (e.g., with altered magic bytes or custom stubs) that may require manual unpacking, but standard UPX detection with PEiD's entropy and section name is a reliable indicator for using the official UPX tool.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the CHFI exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
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FAQ
Mobile and Malware Forensics — This question tests Mobile and Malware Forensics — Read the scenario before looking for a memorised answer..
The correct answer is: UPX -d — The presence of 'UPX0' as the entry point section name and an entropy value of 7.8 (very high, indicating compression or encryption) strongly suggests the malware is packed with UPX (Ultimate Packer for eXecutables). The correct next step is to use UPX with the -d (decompress) switch to unpack the binary, restoring the original executable for static analysis. This is a standard, reversible unpacking method that does not require dynamic analysis or disassembly of the packed stub.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
This CHFI practice question is part of Courseiva's free EC-Council certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CHFI exam.
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