offensive-shellcode
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.
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Critical
Do not install without reviewing
Security
3 findings: 2 critical severity, 1 medium severity. Installing this skill is not recommended: please review these findings carefully if you do intend to do so.
E005: Suspicious download URL detected in skill instructions.
What this means
Detected a suspicious URL in the skill instructions that could lead the agent to download and execute malicious scripts or binaries. This includes links to executables from untrusted sources, typosquatting of official packages, URL shorteners that obscure the destination, and personal file hosting services.
Why it was flagged
All listed URLs point to GitHub repositories that provide shellcode loaders, PE-to-shellcode converters, injection techniques and EDR/Defender bypass tools — clearly high-risk, dual‑use/malicious tooling that can distribute malware.
E006: Malicious code pattern detected in skill scripts.
What this means
Detected high-risk code patterns in the skill content — including its prompts, tool definitions, and resources — such as data exfiltration, backdoors, remote code execution, credential theft, system compromise, supply chain attacks, and obfuscation techniques.
Why it was flagged
This document is an explicit, step-by-step guide to developing, packaging, hiding, and executing shellcode (including process injection and evasion techniques) and contains a complete reverse-shell payload that connects to a C2 — clearly intended for malicious/backdoor use.
W013: Attempt to modify system services in skill instructions.
What this means
The skill prompts the agent to compromise the security or integrity of the user’s machine by modifying system-level services or configurations, such as obtaining elevated privileges, altering startup scripts, or changing system-wide settings.
Why it was flagged
This skill explicitly instructs allocating/writing/executing shellcode, bypassing DEP/AMSI/EDR, performing process injection and in-memory patching, and even modifying system signing/persistence mechanisms — all actions that change or subvert the host system state.
- Repository
- SnailSploit/Claude-Red
- Commit
24d7968
- Audited
- Security analysis
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