Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add ogrodev/fsociety --skill binary-diffinggit clone --depth 1 https://github.com/ogrodev/fsocietyWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/ogrodev/fsociety/binary-diffing)<a href="https://agentmods.dev/skills/ogrodev/fsociety/binary-diffing"><img src="https://agentmods.dev/badge/skills/ogrodev/fsociety/binary-diffing/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/ogrodev/fsociety/binary-diffing"><img src="https://agentmods.dev/badge/skills/ogrodev/fsociety/binary-diffing.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00293 | $0.02578 |
| Opus 5.5 | $0.00117 | $0.01031 |
| Sonnet 5.5 | $0.00059 | $0.00516 |
| Haiku 4.5 | $0.00029 | $0.00258 |
Grade A, and why
binary-diffing scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 216 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Binary Diffing
Overview
Binary diffing compares two versions of a compiled binary to isolate exactly what changed. This is one of the highest-value reverse engineering techniques because it converts a vendor's patch into a roadmap pointing straight at the vulnerability. The same technique applies to tracking malware evolution, understanding firmware updates, and auditing software changes between releases.
Why this matters: When Microsoft ships a Patch Tuesday update, the patch itself tells you what was vulnerable. A well-executed diff workflow can identify the exploitable condition in hours, not days.
Core Use Cases
| Use Case | Input | Output |
|---|---|---|
| Patch analysis (1-day development) | Pre-patch + post-patch binary | Vulnerable function, root cause, exploitable condition |
| CVE reproduction | Advisory + patched binary pair | Proof of concept targeting the patched flaw |
| Malware variant tracking | Sample A + Sample B | Behavioral delta, new capabilities, C2 changes |
| Firmware update analysis | Firmware v1 + v2 (extracted) | Changed drivers, new mitigations, removed features |
| Software audit | Release N + Release N+1 | Security-relevant changes, regression candidates |
Tool Routing
| Task | Tool | When to Use |
|---|---|---|
| Byte-level diff | radiff2 <old> <new> |
Quick triage — see raw byte changes |
| Code block comparison | radiff2 -C <old> <new> |
Identify changed basic blocks |
| Graph-based diffing | BinDiff (via Ghidra/IDA export) | Deep function matching with CFG comparison |
| Scriptable diffing | Diaphora (Ghidra/IDA plugin) | Customizable matching, SQL-backed results |
| Similarity scoring | ssdeep -l <old> <new> |
Quick similarity percentage between files |
| Section comparison | r2 -qc 'iS' <old> vs <new> |
Detect section size/permission changes |
| Import/export delta | r2 -qc 'ii' / r2 -qc 'iE' |
New APIs, removed functions |
| String delta | strings or floss on both |
New URLs, error messages, config values |
| Function listing | r2 -qc 'aaa; afl' on both |
Function count, name, and size comparison |
What ships with it
4 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 1mo ago First seen · 216 lines · 293 tokens per session scan A fdaf2273b0ac
binary-diffing is a skill published in the GitHub repository ogrodev/fsociety (20 stars, last pushed 7mo ago), licensed MIT. It adds 293 tokens to every session and 2,578 once invoked, about $0.0012 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
Other skills, from other repositories
mks
MKS (Metasploit-Kali Server) tool preference guide. Mount in Phase 0/1 alongside the primary skill. Provides URL resolution, REST endpoint patterns, response parsing, error handling, and fallback rules for all MKS-backed Kali tools.
pentest
Penetration testing orchestrator that coordinates specialized attack agents. Provides attack indexes, methodology frameworks, and documentation. Execution delegated to specialized agents (SQL Injection, XSS, SSRF, etc.). Use for engagement planning and attack coordination.
authenticating
Authentication testing skill - automates signup, login, 2FA bypass, CAPTCHA solving, and bot detection evasion using Playwright MCP. Tests authentication security controls. Includes behavioral biometrics simulation, OTP handling, and automated account creation for security assessments.
common-appsec-patterns
Application security testing coordinator for common vulnerability patterns including XSS, injection flaws, and client-side security issues. Orchestrates specialized testing agents to identify and validate common application security weaknesses.
web-application-mapping
Comprehensive web application reconnaissance and mapping coordinator that orchestrates passive browsing, active endpoint discovery, attack surface analysis, and headless browser automation for complete application coverage.
cve-testing
CVE vulnerability testing coordinator that identifies technology stacks, researches known vulnerabilities, and tests applications for exploitable CVEs using public exploits and proof-of-concept code.