acheron - indirect syscalls for AV/EDR evasion in Go assembl

项目说明

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About

Acheron is a library inspired by SysWhisper3/FreshyCalls/RecycledGate, with most of the functionality implemented in Go assembly. </br>

acheron package can be used to add indirect syscall capabilities to your Golang tradecraft, to bypass AV/EDRs that makes use of usermode hooks and instrumentation callbacks to detect anomalous syscalls that don't return to ntdll.dll, when the call transition back from kernel->userland.

Main Features

How it works

The following steps are performed when creating a new syscall proxy instance:

1. Walk the PEB to retrieve the base address of in-memory ntdll.dll
2. Parse the exports directory to retrieve the address of each exported function
3. Calculate the system service number for each Zw* function
4. Enumerate unhooked/clean syscall;ret gadgets in ntdll.dll, to be used as trampolines
5. Creates the proxy instance, which can be used to make indirect (or direct) syscalls

Quickstart

Integrating acheron into your offsec tools is pretty easy. You can install the package with:

Then just need to call acheron.New() to create a syscall proxy instance and use acheron.Syscall() to make an indirect syscall for Nt* APIs.

Minimal example:

Examples

The following examples are included in the repository:

| Example | Description |
| --------------------------------------------- | ------------------------------------------------------------------------------------------ |
| sc_inject | Extremely simple process injection PoC, with support for both direct and indirect syscalls |
| process_snapshot | Using indirect syscalls to take process snapshots with syscalls |
| custom_hashfunc | Example of custom encoding/hashing function that can be used with acheron |

Other projects that use acheron:

Contributing

Contributions are welcome! Below are some of the things that it would be nice to have in the future:

If you have any suggestions or ideas, feel free to open an issue or a PR.

References

Additional Notes

The name is a reference to the Acheron river in Greek mythology, which is the ri souls of the dead are carried to the underworld.

> Note </br>
> This project uses semantic . Minor and patch releases should not break compatibility with previous . Major releases will only be used for major changes that break compatibility with previous .

> Warning </br>
> This project has been created for educational purposes only. Don't use it to on systems you don't own. The de of this project is not responsible for any damage caused by the improper usage of the library.

License

This project is licensed under the MIT License - see the LICENSE file for details

项目信息

开发语言：Assembly

Star 数：392

技术要点

该项目属于红蓝攻防方向的开源资源，代码结构清晰，适合安全研究人员学习参考。项目围绕indirect syscalls for AV/EDR evasion in Go assembly展开，提供了可运行的实现，对理解相关安全机制、工具原理与攻防技术具有较高的研究价值。

从技术实现角度看，此类项目的核心在于对底层原理的深入理解与工程化落地。开发者在研究过程中可以结合官方文档与社区讨论，梳理项目的初始化流程、核心模块职责与数据流转，逐步掌握其中的技术细节与设计思路。

使用与学习建议

1. 下载源码压缩包，解压到本地环境。

2. 根据项目类型准备对应的运行环境与依赖。

3. 按照 README 中的步骤完成配置与部署。

4. 在隔离的测试环境中运行验证，避免影响生产系统。

免责声明

本资源来源于开源社区，仅供安全研究、技术学习与合法授权范围内的攻防演练使用，请勿用于任何非法或侵害他人权益的用途。使用本项目产生的一切后果由使用者自行承担。