dsl-vm-reverse

dsl-vm-reverse is a skill for Claude Code, Codex from Mouseww/anything-analyzer. It costs 63 tokens per session (3,927 once invoked), scanned A, a copy of dsl-vm-reverse, Apache-2.0.

A workflow for examining JavaScript programs that implement their own instruction language or virtual machine, including unusual WebAssembly-like runtimes and risk-control engines.

In plain words
What is it for?
Use it to classify suspicious or heavily compressed JavaScript, extract instruction tables, map opcode behavior, capture runtime state, and trace the execution flow.
Why use it?
It gives a structured way to identify the interpreter, decode its instructions, observe its state while running, and reconstruct how execution works instead of treating the file as ordinary JavaScript.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it to classify suspicious or heavily compressed JavaScript, extract instruction tables, map opcode behavior, capture runtime state, and trace the execution flow.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/mouseww/anything-analyzer/dsl-vm-reverse
About the project

Anything Analyzer is a protocol-analysis toolkit that captures traffic from browsers, desktop and terminal programs, scripts, mobile devices, and other equipment, then uses AI to analyze the resulting requests. It combines browser capture, MITM proxying, JavaScript hooks, fingerprint spoofing, and MCP integration so AI agents and IDEs can inspect APIs, encryption, security issues, and service calls. The catalogue skills expose these capture and analysis workflows to agent tools.

Mouseww/anything-analyzer · 3,775 stars · on GitHub

Install

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.

Any agent
npx skills add Mouseww/anything-analyzer --skill dsl-vm-reverse
Clone the repo
git clone --depth 1 https://github.com/Mouseww/anything-analyzer

Made for: Claude Code, Codex.

Wrote 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.

agentmods badge for dsl-vm-reverse

README.md
[![agentmods](https://agentmods.dev/badge/skills/mouseww/anything-analyzer/dsl-vm-reverse/github.svg)](https://agentmods.dev/skills/mouseww/anything-analyzer/dsl-vm-reverse)
Your own site
<a href="https://agentmods.dev/skills/mouseww/anything-analyzer/dsl-vm-reverse"><img src="https://agentmods.dev/badge/skills/mouseww/anything-analyzer/dsl-vm-reverse/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.

agentmods 80×15 button for dsl-vm-reverse

Your own site · 80×15
<a href="https://agentmods.dev/skills/mouseww/anything-analyzer/dsl-vm-reverse"><img src="https://agentmods.dev/badge/skills/mouseww/anything-analyzer/dsl-vm-reverse.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 63 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,927 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin 100% copy Near-identical to another mod in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00063 $0.03927
Opus 5.5 $0.00025 $0.01571
Sonnet 5.5 $0.00013 $0.00785
Haiku 4.5 $0.00006 $0.00393

Measured 9d ago against content hash d3903b68141e, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

dsl-vm-reverse 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 9d 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.

Origin

This is a copy

100% identical to dsl-vm-reverse — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

resources/skills/reverse-skill/reverse-engineering/dsl-vm-reverse/SKILL.md · 381 lines

How it starts

The opening of the file, as written. The whole thing — 381 lines — stays where its author put it; the contents beside it link to each section on GitHub.

🔄 DSL 自定义虚拟机逆向(DSL VM Reverse Engineering)

ACTION REQUIRED(读完后立刻执行)

  1. NOW: 确认当前任务是自定义 JS opcode VM / 风控引擎,不是标准 WASM 或普通 webpack
  2. NOW: case-init 直到 scope.md 就绪;离线样本用 offline / lab
  3. ACT: 从「3. 通用逆向工作流」Phase 1 做文件分类,不要停在目录

用于逆向基于 JavaScript 实现的自定义 WASM 虚拟机/风控引擎


目录


1. 适用范围

当目标文件符合以下 任意特征 时使用本 skill:

# 特征 说明
1 IIFE 开头 + 大量单字母变量名 !function(){var U=void 0,y=parseInt,E0=Function,...}
2 包含 DG() 或类似函数含 switch-case 循环 解释器主循环,d[7]&31 解码 opcode
3 大文件(500KB+)但零字节占比 < 1% 非标准 WASM,纯 JS
4 包含 C[number] 常量表引用 C[9][xxx] 函数表/字符串表
5 单行压缩代码 583KB 单行,混淆变量名

排除规则

条件 非本 skill 转至
文件以 \x00asm 开头 标准 WASM 二进制 reverse-engineering/languages.md
文件以 Uint8Array([0,97,115,109]) 含 WASM 魔术字 WASM 嵌入式 提取 .wasm 后转 IDA/Ghidra
标准 Webpack 打包(function(e,t,n){...}) 普通 JS js-reverse/
零字节占比 > 20% WASM 二进制 reverse-engineering/languages.md

2. DSL VM 识别特征

代码特征

// 特征 1: IIFE 入口,单字母变量映射数字常量
!function(){
    var U=void 0, y=parseInt, E0=Function, AN=Uint8Array;
    var E=15, l=10, m=12, x=16, S=13, $=11;
    // 数字常量映射为变量名,替代原始数字
    ...
}

// 特征 2: 解释器主循环 DG()
function DG(C, d, ...) {
    var d = [];  // 数组模拟 WASM stack/locals
    for (d[7] = x; d[7] !== U;) {
        var aE = d[7] & 31;         // 低 5 位 = opcode
        var O = d[7] >> 5 & 31;      // 高 5 位 = sub-operation
        switch (aE) {
            case 0: /* ... */ d[7] = 612; break;
            case 1: /* ... */
            // ... N 个 case
        }
    }
}

// 特征 3: 常量表 C[9] 存储函数索引和字符串
// C[9][0] = ["pc"]      → 函数参数描述
// C[9][667] = "string"  → 字符串常量
// C[9][x] = number      → 函数索引

// 特征 4: W(C[index], null, ...) 调用模式
// W = Function.prototype.call.bind(call)
// 所有内置函数通过 C[index] 索引调用

// 特征 5: 指令编码格式
// d[7] = opcode(bit 0-4) | subop(bit 5-9) | operand(bit 10+)

Read the full file on GitHub · 381 lines

Changes

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.

  1. 9d ago First seen · 381 lines · 63 tokens per session scan A d3903b68141e

Subscribe to this mod's changes

dsl-vm-reverse is a skill published in the GitHub repository Mouseww/anything-analyzer (3,775 stars, last pushed 10d ago), licensed Apache-2.0. It adds 63 tokens to every session and 3,927 once invoked, about $0.0003 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 100% identical to dsl-vm-reverse, differing in 0 lines, and is treated as a copy.

Related

Other skills, from other repositories

stealth-browser-mcp

Use this skill when operating stealth-browser-mcp from an AI agent or MCP client for browser automation, page inspection, element interaction, screenshots, file uploads, CDP commands, network debugging, cookies/storage, stealth setup, or reliable multi-step browser workflows. It provides the correct tool order, state…

vibheksoni/stealth-browser-mcp · 76 tokens

omh-code-review

This is an OMH code-review workflow skill, projected for Agent Skills hosts (Claude Code, Codex, Cursor, opencode, OpenClaw, pi).

rlaope/oh-my-hermes · 48 tokens

omh-rust

This is an OMH rust workflow skill, projected for Agent Skills hosts (Claude Code, Codex, Cursor, opencode, OpenClaw, pi).

rlaope/oh-my-hermes · 74 tokens

redteam-web-detail-pack

Routing and boundary guidance for authorized general web application security testing. Use as a web testing router when the attack surface should be dispatched to more specific web vulnerability skills.

Netw0rkNoob/VulnClaw · 38 tokens

android-pentest

A guide for authorized security testing of Android apps, covering APK inspection, runtime testing, traffic capture, code review, and function hooking. An APK is the installable package used by an Android app.

Netw0rkNoob/VulnClaw · 32 tokens

manage-schemas

Creates, views, edits, deletes, and validates note schemas for the MCP Task Orchestrator in .taskorchestrator/config.yaml — the templates that define which notes agents must fill at each workflow phase. Also recommends schema designs from a library of workflow patterns (autonomous coding loops, spec-driven teams…

jpicklyk/task-orchestrator · 212 tokens