GREM GIAC Reverse Engineering Malware Practice Test PDF (Free Printable 2026)

Free GREM Practice Test PDF Download

The GIAC Reverse Engineering Malware (GREM) certification validates advanced skills in analyzing malicious software using static and dynamic analysis techniques. It is one of the most respected credentials in incident response and threat intelligence — and one of the most technically demanding. Our free printable GREM practice test PDF gives you realistic exam-style questions covering assembly language, Windows internals, obfuscation techniques, and malware analysis tools so you can test your knowledge offline before sitting the proctored exam.

Whether you are working through SANS FOR610 course material or self-studying for the GREM, this PDF covers the core analysis domains: static binary analysis, dynamic behavioral analysis, x86 assembly interpretation, code unpacking, shellcode analysis, and document-based malware. Print it, work through it, and use the answer explanations to identify which technical areas need the most additional study time.

GREM Exam Domains and Study Guide

Malware Analysis Concepts and Methodology

The GREM exam expects you to understand the full malware analysis workflow before diving into technical specifics. Static analysis means examining a malware sample without executing it — extracting strings, examining the PE header, looking up imported API functions, and identifying packers or protectors using tools like PEiD or Detect-It-Easy. Dynamic analysis means actually executing the sample in a controlled sandbox environment and observing its behavior: what files it creates, what registry keys it modifies, what network connections it initiates, and what processes it spawns or injects into.

Hybrid analysis combines both approaches. For most real-world samples, you start with static analysis to understand the sample's capabilities and identify obvious indicators, then move to dynamic analysis to confirm behavior. The GREM exam tests your ability to choose the right technique for different malware types and to interpret results from each approach accurately.

x86 Assembly Language for Malware Analysts

You do not need to be an assembly programmer to pass GREM, but you must be able to read and interpret x86 disassembly at a functional level. Focus on the most common instructions: MOV (data movement), PUSH/POP (stack operations), CALL/RET (function calls and returns), JMP/JE/JNE/JZ/JNZ (control flow), CMP and TEST (comparisons), and arithmetic operations (ADD, SUB, MUL, XOR). XOR is especially important — XOR eax, eax is the standard way to zero a register, and XOR-based loops are frequently used in simple encryption/obfuscation routines.

Calling conventions matter for understanding how arguments are passed to Windows API functions. The stdcall convention (used by most Win32 APIs) passes arguments on the stack right-to-left before the CALL instruction. When you see a sequence of PUSH instructions followed by CALL, you are looking at a Windows API call — identify which API is being called and what arguments are being passed to understand what the malware is about to do.

Windows OS Internals for Malware Analysis

The PE (Portable Executable) file format is foundational to GREM. You need to understand the MZ and PE headers, the section table (.text, .data, .rsrc, .reloc), imported and exported functions, and how the Windows loader resolves imports at runtime. Malware frequently manipulates the import table or resolves API functions dynamically using LoadLibrary and GetProcAddress to evade static detection.

Process injection techniques are heavily tested. Understand the difference between DLL injection (writing a DLL path into a remote process and calling CreateRemoteThread to load it), process hollowing (spawning a legitimate process in suspended state, replacing its memory with malicious code, then resuming it), and reflective DLL injection (a DLL that loads itself entirely from memory). Each technique uses a characteristic sequence of Windows API calls that you must recognize in disassembly or API monitor logs.

Code Obfuscation and Unpacking

Packers compress or encrypt malware to make static analysis harder. When you load a packed binary into IDA Pro or Ghidra, the entry point lands in a stub that decrypts or decompresses the real payload, then transfers control to the unpacked code — often by jumping to the original entry point (OEP). Common packers include UPX, MPRESS, and custom packers used by malware families like Emotet and TrickBot.

Manual unpacking in OllyDbg or x64dbg involves setting breakpoints at the right location (often ESP-based tricks after the unpacking loop completes), running the sample until the OEP is reached, then dumping the unpacked process memory and fixing the import table with a tool like Scylla. Practice this workflow with UPX-packed samples before attempting more complex custom packers.

Network Traffic Analysis and Persistence

During dynamic analysis, Wireshark and FakeNet-NG capture all network traffic generated by the sample. Look for DNS queries to DGA (domain generation algorithm) domains, HTTP or HTTPS beaconing to command-and-control servers, IRC-based C2 (less common but still tested), and encoded data exfiltration. Understanding base64 encoding and simple XOR encoding allows you to decode network payloads directly in Wireshark.

Persistence mechanisms are a core GREM topic. The most common registry autorun location is HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run. Scheduled tasks created via schtasks.exe or the Task Scheduler API, service installation via CreateService(), and DLL search order hijacking (placing a malicious DLL in a location searched before the legitimate one) are all frequently tested. Use Process Monitor filtered by process name to capture all registry and file system writes during dynamic analysis.

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