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Introduction:
Assembly language remains the foundation of reverse engineering, malware analysis, and exploit development. Understanding x86 and x64 architectures allows security professionals to dissect binaries, decode malicious opcodes, and recognize control flow structures in real-world malware. Blackstorm Security’s upcoming Assembly training (starting February 6, 2027) promises a deep, hands-on approach with physical kits, live instruction, and post-training support—targeting both beginners and seasoned reversers.
Learning Objectives:
- Decode and interpret x86/x64 opcodes extracted from live malware samples
- Analyze stack frames, calling conventions, and control flow structures (loops, conditionals) in disassembled binaries
- Apply reverse engineering techniques using industry tools (IDA Pro, Ghidra, x64dbg, radare2) on real malicious code
You Should Know:
1. Understanding x86 vs. x64 Assembly Fundamentals
The training begins with core differences between x86 (32-bit) and x64 (64-bit) architectures. Key concepts include register sets (EAX vs. RAX), addressing modes, and the impact on stack alignment. In reverse engineering, misinterpreting register width or calling conventions leads to flawed analysis.
Step-by-step guide to inspect assembly on Linux/Windows:
Linux (objdump & gdb):
Compile a simple C program with debug symbols gcc -g -o sample sample.c Disassemble the binary with Intel syntax objdump -d -M intel sample | less Or use gdb for dynamic analysis gdb ./sample (gdb) disas main (gdb) info registers (gdb) x/10i $rip examine next 10 instructions
Windows (x64dbg & dumpbin):
Dump headers and disassembly (Visual Studio tools) dumpbin /disasm sample.exe Using x64dbg: attach to process, view CPU pane, step through instructions Set breakpoint on entry point: BP on EntryPoint
Malware opcode decoding example:
Common malicious opcodes: `0xCC` (int3 – breakpoint, used for anti-debug), `0xEB 0xFE` (JMP short to self – infinite loop). Use a hex editor to locate these in a suspicious binary.
2. Stack & Calling Conventions in Reverse Engineering
Stack analysis is critical for understanding function arguments and return addresses. x86 typically uses `cdecl` (caller cleans stack) or `stdcall` (callee cleans), while x64 uses `fastcall` with RCX, RDX, R8, R9 for first four arguments.
Step-by-step stack trace extraction (Linux):
Using gdb on a crash dump gdb ./vulnerable core (gdb) bt backtrace – shows call stack (gdb) frame 0 select current frame (gdb) info frame show stack addresses, saved RIP (gdb) x/20wx $rsp dump raw stack memory For malware analysis – trace API calls via ltrace ltrace -e "strcmp,memcpy,CreateFile" ./suspicious 2>&1 | tee api_calls.log
Windows (WinDbg) stack commands:
Attach to process windbg -pn malware.exe 0:000> k display call stack 0:000> r show registers (RSP points to stack top) 0:000> dqs rsp dump QWORDs on stack 0:000> .frame /r 0 set frame and display registers
Recognizing calling conventions: In x86 stdcall, you’ll see `ret 0x10` (callee pops 16 bytes). In cdecl, the caller adds `add esp, 0x10` after call. In malware, misaligned stack often indicates anti-disassembly tricks.
3. Decoding Opcodes & Recognizing Control Structures
The training includes a dedicated section on translating raw bytes into instructions and identifying if-then-else, loops (JMP back), and switch tables. Real malware often uses obfuscated opcode sequences.
Step-by-step manual opcode decoding (using Python & capstone):
Install capstone: pip install capstone
from capstone import Cs, CS_ARCH_X86, CS_MODE_64
Raw shellcode (example: pop calc on Windows)
shellcode = b"\xfc\x48\x83\xe4\xf0\xe8\xc0\x00\x00\x00\x41\x51\x41\x50\x52"
md = Cs(CS_ARCH_X86, CS_MODE_64)
for i in md.disasm(shellcode, 0x1000):
print(f"0x{i.address:x}:\t{i.mnemonic}\t{i.op_str}")
Recognizing loops in assembly:
- Conditional jumps at end of block: `cmp eax, 0x10; jl loop_start` (while/for)
– `loop` instruction (uses ECX counter) – common in older malware - Anti-disassembly using `jmp` + `call` + `pop` to hide strings
Linux command to identify loop patterns in a binary:
objdump -d -M intel binary | grep -E "cmp.j[bash]|loop|jmp" | head -20
4. Live Malware Sample Interpretation
The course provides real malware code and guided interpretation. For practice, analyze a known ransomware sample’s encryption routine or a dropper’s PE loader.
Step-by-step analysis with Ghidra (free & open source):
Install Ghidra from gh idra.re or apt 1. Create a new project, import malware.exe 2. Auto-analyze (default settings) 3. Locate entry point (usually _start or WinMain) 4. Rename functions: look for calls to CryptEncrypt, CreateRemoteThread 5. Decompile (C pseudo-code) to verify logic
Windows command-line static analysis (sysinternals strings + PEview):
strings -n 8 malware.exe | findstr /i "http .dll CreateFile" dumpbin /imports malware.exe list imported APIs
For dynamic analysis in a sandbox (Flare VM + x64dbg):
– Set hardware breakpoints on registry/key APIs (RegOpenKeyEx, RegSetValue)
– Trace instruction flow with `Trace into` to capture decryption loops
5. Post-Training Support & Real-World Challenges
Blackstorm offers Q&A sessions, private groups with new challenges, and physical printed materials. To maximize this, build a lab environment that mirrors their exercises.
Step-by-step reverse engineering lab setup:
Linux REMnux (free malware analysis distro) wget https://REMnux.org/remnux.iso Install in VirtualBox, tools include radare2, binwalk, olevba Windows Flare VM (FireEye’s toolkit) Run PowerShell as admin: Set-ExecutionPolicy Unrestricted -Force .\install.ps1 -installAll
Useful commands for solving training challenges:
Extract strings from packed binary radare2 -A -c "/bin/sh" malware search for "/bin/sh" string Find XOR obfuscation loops r2 -c "e search.from=0; e search.to=0x1000; /x 31c0" XOR EAX,EAX pattern
API monitor on Windows to trace malware behavior:
apimonitor-x64.exe /pid 1234 /export:kernel32.dll!CreateFile,kernel32.dll!WriteFile
6. Practical Exploitation Mitigation & Vulnerability Research
Understanding assembly also aids in finding buffer overflows, ROP gadgets, and bypassing ASLR/DEP. The training’s exploit development angle prepares you for CVEs.
Linux exploit dev quick start:
Compile vulnerable binary with no protections
gcc -fno-stack-protector -z execstack -o vuln vuln.c
Find offset with pattern create (msf-pattern_create)
msf-pattern_create -l 100
Attach gdb, crash, find EIP control
gdb ./vuln
(gdb) run $(python -c 'print("A"offset + "BBBB")')
Windows exploit mitigation bypass (Ret2libc example in assembly):
- Craft payload: `pop rdi; ret` gadget + address of `system` + pointer to “cmd.exe”
- Use `!mona` in WinDbg or `ROPgadget` to find gadgets:
ROPgadget --binary vuln.exe | grep "pop rdi"
7. Course Specifics: Physical Kit & Hands-On Time
Blackstorm emphasizes 100% live instruction (no labs eaten by video) + printed material shipped worldwide. To emulate their “real problems” focus, try these challenges:
Daily reverse challenge (Linux/Mac/Windows):
Day 1: Crack a simple crackme with Ghidra wget https://crackmes.one/static/crackme.exe Find the hidden password by tracing strcmp in debugger Day 2: Unpack a UPX-packed binary upx -d packed.exe unpack Then analyze original import table
Linux command to simulate opcode challenge:
echo -ne "\x55\x48\x89\xe5\x89\x7d\xfc" | ndisasm -b 64 - decode raw bytes Output: push rbp; mov rbp, rsp; mov [rbp-0x4], edi
What Alexandre Borges Says:
- “The training is more technical and detailed than any other in the market, with constant updates and real malware samples.”
- “Every hour of the course is live instruction – no filler – and you get a physical kit shipped to your home, including printed certificate and custom box.”
Analysis: Borges, a well-known exploit developer and reverse engineer, emphasizes practicality. The physical materials indicate a premium offering, while post-training Q&A and private groups address the common problem of learning assembly without ongoing mentorship. Their focus on both x86 and x64 covers legacy and modern malware. For students, the inclusion of opcode decoding and control structure recognition bridges the gap between theoretical assembly and actual malware triage. The 2027 date suggests high demand or limited seats – early registration is advisable.
Prediction:
By 2027, malware will increasingly use obfuscated x64 shellcode and anti-emulation techniques. Training like Blackstorm’s will become essential as AI-generated malware evades signature detection. Expect more courses to adopt physical kits and real-time instruction to combat the rise of automated reverse engineering tools. Assembly literacy will remain a non-negotiable skill for vulnerability researchers, with a growing premium on x64-specific calling conventions and ROP chain analysis.
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Reported By: Aleborges Assembly – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
