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SKILL verified MIT Self-run

Binary Diff

skill-zhaoxuya520-reverse-skill-binary-diff · by zhaoxuya520

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$ agentstack add skill-zhaoxuya520-reverse-skill-binary-diff

✓ scanned · ✓ verified, works with Claude Code, Cursor, and more.

Security review

✓ Passed

No issues found. Passed automated security review. · v0.1.0 How review works →

  • Prompt-injection patterns
  • Secret / credential exfiltration
  • Dangerous shell & filesystem operations
  • Untrusted network calls
  • Known-malicious package signatures

What it can access

  • Network access Used
  • Filesystem access No
  • Shell / process execution No
  • Environment & secrets No
  • Dynamic code execution No

From automated source analysis of v0.1.0. “Used” means the capability is present in the source — more access means more to trust, not that it’s unsafe.

View the full security report →

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Reliability & compatibility

Security review passed
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1mo ago

Declared compatibility

Claude CodeClaude Desktop

Compatibility is declared by the source manifest. End-to-end runtime verification is coming, see below.

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About

跨版本符号迁移 (Binary Diff)

适用范围

当任务属于以下场景时使用本 skill:

  1. 内核/驱动缺 PDB — 有旧版 ntoskrnl.exe 的符号,新版 PDB 被微软下架,需要用旧版符号推导新版非导出函数地址
  2. 程序更新后符号迁移 — 曾经逆向过某个程序,程序更新了,不想重新逆一遍,用旧版结果批量迁移
  3. 保护机制更新 — 旧版有完整逆向结果,新版需要快速定位同一函数的新偏移
  4. 任何"有旧版符号 + 新版无符号"的二进制对比场景

与其他 skill 的分工

| 场景 | 用什么 | |------|--------| | 从零开始逆向一个二进制 | ida-reverse/radare2/ | | 有旧版结果,迁移到新版 | 本 skill | | 两个完全不同的二进制对比 | BinDiff / Diaphora(传统工具) |

核心优势

相比传统方案:

| 方案 | 200 个函数成本 | 时间 | 准确率 | |------|--------------|------|--------| | 人工开两个 IDA 窗口对比 | 免费但耗命 | 数小时 | 高 | | BinDiff 自动匹配 | 免费 | 快 | 中(结构变化大时失效) | | 完全交给 Agent(CC/Codex) | 50-100 元 | 慢 | 高 | | 本 skill(LLM 批量比对) | ~1 元 | ~10 秒/函数 | |

核心原理

旧版函数(有符号)          新版同一函数(无符号)
    ↓                              ↓
导出反汇编 + 伪代码          导出反汇编 + 伪代码
    ↓                              ↓
    └──────── LLM 结构化比对 ────────┘
                    ↓
         输出 YAML(符号映射表)
                    ↓
         程序化解析 → 批量应用到新版 IDB

关键点:

  • prompt 是固定模板,程序化填充
  • 输入输出格式确定,程序化解析
  • LLM 只负责"看两段代码,找出对应关系"这一步
  • 时间成本和 token 成本极低

Prompt 模板

标准比对 Prompt

I have disassembly outputs and procedure code of the same function.

This is the function for reference:

**Disassembly for Reference**
```c
{disasm_for_reference}

Procedure code for Reference

{procedure_for_reference}

This is the function you need to reverse-engineering:

Disassembly to reverse-engineering

{disasm_code}

Procedure code to reverse-engineering

{procedure}

What you need to do is to collect all references to "{symbolnamelist}" in the function you need to reverse-engineering and output those references as YAML.

Example:

found_vcall: # This is for indirect call to virtual function or virtual function pointer fetching.
  - insn_va: '0x180777700' # Always be the instruction with displacement offset
    insn_disasm: call [rax+68h] # Always be the instruction with displacement offset
    vfunc_offset: '0x68'
    func_name: ILoopMode_OnLoopActivate
  - insn_va: '0x180777778' # Always be the instruction with displacement offset
    insn_disasm: mov rax, [rax+80h] # Always be the instruction with displacement offset
    vfunc_offset: '0x80'
    func_name: INetworkMessages_GetNetworkGroupCount

found_call: # This is for direct call to non-virtual regular function.
  - insn_va: '0x180888800'
    insn_disasm: call sub_180999900
    func_name: CLoopMode_RegisterEventMapInternal
  - insn_va: '0x180888880'
    insn_disasm: call sub_180555500
    func_name: CLoopMode_SetSystemState

found_funcptr: # This is for non-virtual regular function pointer.
  - insn_va: '0x180666600' # Must load/reference the function pointer target address
    insn_disasm: lea rdx, sub_15BC910 # Must load/reference the function pointer target address
    funcptr_name: CLoopMode_OnClientPollNetworking

found_gv: # This is for reference to global variable.
  - insn_va: '0x180444400'
    insn_disasm: mov rcx, cs:qword_180666600 # Must load/reference the global variable
    gv_name: g_pNetworkMessages
  - insn_va: '0x180333300'
    insn_disasm: lea rax, unk_180222200 # Must load/reference the global variable
    gv_name: s_EventManager

found_struct_offset: # This is for reference to struct offset. NOTE THAT virtual function pointer should not be here! virtual function pointer should ALWAYS be in found_vcall !
  - insn_va: '0x1801BA12A' # Always be the instruction with displacement offset
    insn_disasm: mov rcx, [r14+58h] # Always be the instruction with displacement offset
    offset: '0x58'
    size: 8
    struct_name: CResourceService
    member_name: m_pEntitySystem

If nothing found, output an empty YAML. DO NOT output anything other than the desired YAML. DO NOT collect unrelated symbols.


### 变量说明

| 变量 | 来源 | 说明 |
|------|------|------|
| `{disasm_for_reference}` | 旧版 IDA 导出 | 有符号的反汇编 |
| `{procedure_for_reference}` | 旧版 IDA 导出 | 有符号的伪代码 |
| `{disasm_code}` | 新版 IDA 导出 | 无符号的反汇编 |
| `{procedure}` | 新版 IDA 导出 | 无符号的伪代码 |
| `{symbol_name_list}` | 从旧版提取 | 需要在新版中定位的符号列表 |

## 工作流

### 完整流程

```text
Step 1: 准备数据
  - 旧版二进制加载到 IDA(有 PDB/符号)
  - 新版二进制加载到 IDA(无符号)
  - 找到两个版本中相同的锚点函数(导出函数、字符串引用等)

Step 2: 批量导出
  - 从旧版导出:锚点函数的反汇编 + 伪代码(含符号名)
  - 从新版导出:同一锚点函数的反汇编 + 伪代码(无符号名)

Step 3: LLM 比对
  - 用 prompt 模板填充数据
  - 调用 LLM API(推荐:deepseek 量大便宜,超大函数切 gpt)
  - 解析返回的 YAML

Step 4: 应用结果
  - 将 YAML 中的符号映射批量应用到新版 IDB
  - 用 idapro_rename 或 IDAPython 脚本批量重命名

Step 5: 迭代
  - 第一轮迁移的函数成为新的锚点
  - 进入这些函数,继续对比内部调用
  - 重复直到覆盖所有目标函数

锚点选择策略

| 锚点类型 | 可靠性 | 说明 | |---------|--------|------| | 导出函数 | 最高 | 名字不变,地址可能变 | | 字符串引用 | 高 | 字符串内容不变,引用位置可能变 | | 常量/魔数 | 中 | 特征值不变 | | 代码模式 | 中 | 函数结构相似但地址全变 |

批量处理建议

  • 每次比对 1 个函数(避免 context 爆炸)
  • 中等函数(500 行)切 gpt-4o 或 claude
  • 并发调用提高速度(10-20 并发)
  • 结果缓存,避免重复调用

输出格式

YAML 输出的 5 种符号类型

| 类型 | 含义 | 关键字段 | |------|------|---------| | found_vcall | 虚函数调用(间接 call) | vfunc_offset, func_name | | found_call | 直接函数调用 | insn_va, func_name | | found_funcptr | 函数指针引用 | insn_va, funcptr_name | | found_gv | 全局变量引用 | insn_va, gv_name | | found_struct_offset | 结构体偏移引用 | offset, struct_name, member_name |

解析后的应用动作

found_call → idapro_rename(addr=call_target, name=func_name)
found_vcall → idapro_set_comments(addr=insn_va, comment="vcall: {func_name} @ +{offset}")
found_funcptr → idapro_rename(addr=funcptr_target, name=funcptr_name)
found_gv → idapro_rename(addr=gv_addr, name=gv_name)
found_struct_offset → idapro_set_comments(addr=insn_va, comment="{struct_name}.{member_name}")

典型场景示例

场景 1:ntoskrnl.exe 缺 PDB

已有:ntoskrnl.exe 10.0.26100.2000 + 完整 PDB
目标:ntoskrnl.exe 10.0.26100.2605(PDB 被下架)
需求:定位 PspSetCreateProcessNotifyRoutine 的新地址

步骤:
1. 两个版本都加载到 IDA
2. 找到导出函数 PsSetCreateProcessNotifyRoutine(两个版本都有)
3. 旧版中它调用了 PspSetCreateProcessNotifyRoutine(有符号)
4. 新版中它调用了 sub_140822108(无符号)
5. LLM 一眼看出:sub_140822108 = PspSetCreateProcessNotifyRoutine
6. 批量应用

场景 2:应用更新后迁移

已有:target.exe v1.0 的完整逆向结果(200+ 函数已命名)
目标:target.exe v1.1(所有符号丢失)
需求:批量迁移 200 个函数名

步骤:
1. 从旧版导出所有已命名函数的反汇编+伪代码
2. 在新版中通过导出函数/字符串找到对应锚点
3. 批量调用 LLM 比对
4. 解析 YAML,批量 rename
5. 迭代深入

LLM 选择建议

| 模型 | 适合场景 | 成本 | 速度 | |------|---------|------|------| | DeepSeek V3 | 中小函数(1000 行反汇编)需要拆分或用大 context 模型


按需自举(On-Demand Bootstrap)

工具依赖

| 工具 | 用途 | 可自动安装 | |------|------|-----------| | IDA Pro | 导出反汇编/伪代码 | ✗(商业软件) | | Python | 脚本执行、API 调用 | ✓ | | PyYAML | 解析 LLM 返回的 YAML | ✓(pip install pyyaml) | | LLM API | 执行比对 | 需要 API key |

说明

本 skill 的核心不依赖重型工具安装,主要依赖:

  • IDA Pro 已有(用 ida-reverse/ skill 管理)
  • Python + requests/httpx(调 API)
  • 一个 LLM API endpoint

路由上下文

上游入口: skills/SKILL.md(总控)、routing.md 触发条件: 有旧版符号/逆向结果,需要迁移到新版本 下游出口:

  • 需要先打开二进制 → ida-reverse/
  • 需要快速侦察确认版本差异 → radare2/

同级关联模块: ida-reverse/(数据导出和符号应用都通过 IDA)

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

Install and usage instructions live in the source repository linked above.

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Versions

  • v0.1.0 Imported from the upstream source.