ChaiLdr – AV Evasive Payload Loader represents a cutting-edge approach in malware development, blending innovative evasion techniques to bypass modern antivirus solutions.

Crafted with advanced concepts learned in malware engineering, this tool introduces a new level of sophistication in delivering payloads undetected.

From indirect syscalls and API hammering to HTTP/S shellcode staging, ChaiLdr sets a new benchmark in the realm of cybersecurity threats.

A simple shellcode loader built with the concepts of Malware development I have learnt till now.


  • Indirect syscalls with SysWhispers3 – jumper_randomized
  • QueueUserAPC Injection
  • HTTP/S shellcode staging
  • Execution delay using API Hammering
  • IAT Camouflage
  • API Hashing

Testing With Havoc And The Latest Windows Defender


CRT Library Removal : I tried a lot to get the payload working with CRT Library removed and make it independent with custom intrinsic functions for – memcpy, memset, rand, stand, etc, but ended up with a lot of crashes and after hours of debugging couldn’t get it working, I’ll incorporate it into a dev branch soon enough.

I have used minicrt, MiniCRT, etc for references but still couldn’t get it to work.

Shellcode Encryption : The shellcode is fetched from a remote server, providing SSL support. I haven’t incorporated any shellcode encryption, when used with Havoc, Havoc provides Sleep encryption.

Why not HellsGate? : HellGate incorporated only direct syscalls, HellsHall uses indirect syscalls, but I’m still learning that and will build my custom implementation of it in the future

EDR Evasion? : This is a simple shellcode payload loader, it can bypass a lot of antivirus software and some EDRs but the techniques it incorporates aren’t the best, so as I keep learning I’ll make better loaders!

Published by Tamil S

Tamil has a great interest in the fields of Cyber Security, OSINT, and CTF projects. Currently, he is deeply involved in researching and publishing various security tools with Kali Linux Tutorials, which is quite fascinating.

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