# boku7/BokuLoader

A proof-of-concept Cobalt Strike Reflective Loader which aims to recreate, integrate, and enhance Cobalt Strike's evasion features!

Repository: https://github.com/boku7/BokuLoader
Canonical: https://ross.abutalabs.com/products/bokuloader
Language: C
License: MIT
License Family: permissive
Topics: boku, cobaltstrike, redteam, reflectiveloader, advsim
Last push: 2023-11-22T22:25:50+00:00

## Health v2 (maintenance only)
Score: 32/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 35, longevity 100
- inputs: {"age_days": 1844, "days_push": 1015, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1431, forks 273 (observed 2026-08-28T04:04:42.960105+00:00)

## What it is
BokuLoader is a proof-of-concept User-Defined Reflective Loader (UDRL) for Cobalt Strike written in C and assembly. It recreates, integrates, and enhances Cobalt Strike's evasion features such as reflective callstack spoofing, indirect NT syscalls, and string obfuscation for red team operations.

## Use cases
- build a custom user-defined reflective loader for Cobalt Strike beacons
- evade EDR detection with reflective callstack spoofing
- use indirect NT syscalls for memory protection changes
- load beacon DLL without copying PE headers into memory
- resolve DLLs and function symbols without LoadLibraryA or GetProcAddress
- obfuscate strings in the loader with Caesar cipher
- learn red team loader development techniques

## When to choose
- you run a Cobalt Strike red team engagement and need stronger evasion than the built-in loader
- you want a reference implementation to build your own in-house UDRL
- you need callstack spoofing, indirect syscalls, and header stomping in one loader

## When to avoid
- you do not have a licensed Cobalt Strike installation, since it is a UDRL for that platform
- you need a production-grade, fully supported loader without testing across compiler, OS, and Java versions
- your use case is defensive research unrelated to offensive tooling

## Facets
- artifact type: library
- maturity: active
- function: security, cryptography, developer-tools
- domain: security, penetration-testing, developer-tools
- platform: windows, cpp
- tags: red-team, cobalt-strike, reflective-loader, evasion, offensive-security, udrl, callstack-spoofing, syscalls

## Member repositories
- boku7/BokuLoader (main) score 32

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:42.960105+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T04:37:05.972563+00:00, confidence not recorded.
  - readme: https://github.com/boku7/BokuLoader (fetched 2026-08-28T04:04:42.960105+00:00, sha 7edc76ad1e36)
- Data as of 2026-08-30T08:39:29.467469+00:00.