offensive-shellcode skillA
offensive-shellcode is agent-read markdown (skill) from snailsploit/claude-red: Shellcode development reference for offensive security engagements. Use when writing custom x86/x64 shellcode, implementing position-independent code (PIC), building shellcode loaders, evading AV/EDR detection, or converting PE files to shellcode. Covers null byte avoidance, API hashing, encoder/decoder patterns, staged vs stageless payloads, Windows PEB traversal, and cross-platform shellcode techniques..
Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns the same grade.
What the file says
## Shellcode Development Workflow 1. Define concept and target platform (x86/x64, Windows/Linux/macOS) 2. Write assembly using position-independent techniques 3. Extract binary and test in controlled environment 4. Apply null byte avoidance and optimizations 5. Encode/encrypt to evade static detection 6. Package with loader and choose delivery method --- ## Basic Concepts ### Execution Pattern (Allocate-Write-Execute) Avoid direct `PAGE_EXECUTE_READWRITE` — prefer: 1. Allocate with `PAGE_READWRITE` 2. Write shellcode to allocated region 3. Call `VirtualProtect` to switch to `PAGE_EXECUTE_READ` ```c char *dest = VirtualAlloc(NULL, 0x1234, MEM_COMMIT|MEM_RESERVE, PAGE_READWRITE); memcpy(dest, shellcode, 0x1234); VirtualProtect(dest, 0x1234, PAGE_EXECUTE_READ, &old); ((void(*)())dest)(); ``` ### Position-Independent Code (PIC) Techniques | Method | Platform | Notes | |--------|----------|-------| | Call/Pop | Windows | Push next addr, pop into register | | FPU state | Windows | `fstenv` saves instruction pointer | | SEH | Windows | Exception handler stores EIP | | GOT | Linux | Global Offset Table | | VDSO | Linux | Kernel-provided shared object | --- …
Read the whole file at its exact version.
How to install
mdr add snailsploit/claude-red/offensive-shellcode@git:20260506.70e0c89mdr add snailsploit/claude-red/offensive-shellcode@sha256:3f6399baf95a1e41Pin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.
[](https://markdownregistry.com/a/art_fkbgjndmr4hdsrtn)
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Versions
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (18885 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
snailsploit/claude-red · 6,831 stars · license MIT · pushed 2026-09-19 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_fkbgjndmr4hdsrtn GET https://markdownregistry.com/api/v1/resolve?ref=snailsploit/claude-red/offensive-shellcode GET https://markdownregistry.com/api/v1/blob/3f6399baf95a1e41c6968ed8b69fcb0989019ae79420298058da48cab3e09a68
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