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75 lines
4.3 KiB
Markdown
75 lines
4.3 KiB
Markdown
# Laika
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<p align="center">
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<a href="https://github.com/CPunch/Laika/actions/workflows/check-build.yaml"><img src="https://github.com/CPunch/Laika/actions/workflows/check-build.yaml/badge.svg" alt="Workflow"></a>
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<a href="https://github.com/CPunch/Laika/blob/main/LICENSE.md"><img src="https://img.shields.io/github/license/CPunch/Laika" alt="License"></a>
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</p>
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Laika is a simple Remote Access Toolkit stack for educational purposes. It allows authenticated communication across a custom protocol with generated key pairs which are embedded into the executable (only the public key is embedded in the bot client ofc). The bot client supports both Windows & Linux environments, while the shell & CNC server specifically target Linux environments.
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Some notable features thus far:
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- [X] Lightweight, the bot alone is 270kb (22kb if not statically linked with LibSodium) and uses very little resources minimizing Laika's footprint.
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- [X] Authentication & packet encryption using LibSodium and a predetermined public CNC key.
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- [X] Ability to open shells remotely on the victim's machine.
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- [ ] Ability to relay socket connections to/from the victim's machine.
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- [ ] Uses obfuscation techniques also seen in the wild (string obfuscation, tiny VMs executing sensitive operations, etc.)
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- [ ] Simple configuration using CMake
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- [X] Setting keypairs (`-DLAIKA_PUBKEY=? -DLAIKA_PRIVKEY=?`, etc.)
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- [ ] Obfuscation modes
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## Would this work in real world scenarios?
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My hope is that this becomes complete enough to be accurate to real RAT sources seen in the wild. However since Laika uses a binary protocol, the traffic the bot/CNC create would look very suspect and scream to sysadmins. This is why most RATs/botnets nowadays use an HTTP-based protocol, not only to 'blend in' with traffic, but it also scales well with large networks of bots where the CNC can be deployed across multiple servers and have a generic HTTP load balancer.
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I could add some padding to each packet to make it look pseudo-HTTP-like, however I haven't given much thought to this.
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## Directories explained
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- `/cmake-modules` holds helper functions for CMake.
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- `/lib` is a shared static library between the bot, shell & CNC. LibSodium is also vendor'd here.
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- `/cnc` is the Command aNd Control server. (Currently only targets Linux)
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- `/bot` is the bot client to be ran on the target machine. (Targets both Linux and Windows)
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- `/shell` is the main shell to connect to the CNC server with to issue commands. (Currently only targets Linux)
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- `/tools` holds tools for generating keypairs, etc.
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## CMake Definitions
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| Definition | Description | Example |
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| ----------------- | ------------------------------------- | --------------------------------------------------------------------------------- |
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| LAIKA_PUBKEY | Sets CNC's public key | -DLAIKA_PUBKEY=997d026d1c65deb6c30468525132be4ea44116d6f194c142347b67ee73d18814 |
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| LAIKA_PRIVKEY | Sets CNC's private key | -DLAIKA_PRIVKEY=1dbd33962f1e170d1e745c6d3e19175049b5616822fac2fa3535d7477957a841 |
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| LAIKA_CNC_IP | Sets CNC's public ip | -DLAIKA_CNC_IP=127.0.0.1 |
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| LAIKA_CNC_PORT | Sets CNC's bind()'d port | -DLAIKA_CNC_PORT=13337 |
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> examples are passed to `cmake -B <dir>`
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## Configuration and compilation
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Make sure you have the following libraries and tools installed:
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- CMake (>=3.10)
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- Compiler with C11 support (GCC >= 4.7, Clang >= 3.1, etc.)
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The only dependency (LibSodium) is vender'd and statically compiled against the `/lib`. This should be kept up-to-date against stable and security related updates to LibSodium.
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First, compile the target normally
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```sh
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$ cmake -B build && cmake --build build
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```
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Now, generate your custom key pair using `genKey`
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```sh
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$ ./bin/genKey
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```
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Next, rerun cmake, but passing your public and private keypairs
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```sh
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$ rm -rf build &&\
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cmake -B build -DLAIKA_PUBKEY=997d026d1c65deb6c30468525132be4ea44116d6f194c142347b67ee73d18814 -DLAIKA_PRIVKEY=1dbd33962f1e170d1e745c6d3e19175049b5616822fac2fa3535d7477957a841 -DCMAKE_BUILD_TYPE=MinSizeRel &&\
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cmake --build build
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```
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Output binaries are put in the `./bin` folder |