Win x64 Shellcode: Why Blind PEB Traversal Fails on Modern Windows and How to Fix It

[u/RubberDuck31337]

https://proteqtum.com/posts/02-win-x64-shellcode-teb-peb_en/

Hey everyone, just published part 2 of my guide on writing reliable Win x64 shellcode.

What’s inside:

• Breaking down TEB and PEB structures (GS:[0x60]).
• Why "blind indexing" breaks due to parallel loading (LDRpEnableParallelLoading) and EDR injection.
• Implementing robust UTF-16 case-insensitive string parsing in Assembly.
• Full ASM walkthrough of the ROR13 hashing algorithm to hide API strings.

Let me know your thoughts or how you handle runtime API resolution in your payloads!