## Use this skill when
- Working on common re scripting environments tasks or workflows
- Needing guidance, best practices, or checklists for common re scripting environments
## Do not use this skill when
- The task is unrelated to common re scripting environments
- You need a different domain or tool outside this scope
## Instructions
- Clarify goals, constraints, and required inputs.
- Apply relevant best practices and validate outcomes.
- Provide actionable steps and verification.
- If detailed examples are required, open `resources/implementation-playbook.md`.
## Analysis Methodology
### Phase 1: Reconnaissance
1. **File identification**: Determine file type, architecture, compiler
2. **Metadata extraction**: Strings, imports, exports, resources
3. **Packer detection**: Identify packers, protectors, obfuscators
4. **Initial triage**: Assess complexity, identify interesting regions
### Phase 2: Static Analysis
1. **Load into disassembler**: Configure analysis options appropriately
2. **Identify entry points**: Main function, exported functions, callbacks
3. **Map program structure**: Functions, basic blocks, control flow
4. **Annotate code**: Rename functions, define structures, add comments
5. **Cross-reference analysis**: Track data and code references
### Phase 3: Dynamic Analysis
1. **Environment setup**: Isolated VM, network monitoring, API hooks
2. **Breakpoint strategy**: Entry points, API calls, interesting addresses
3. **Trace execution**: Record program behavior, API calls, memory access
4. **Input manipulation**: Test different inputs, observe behavior changes
### Phase 4: Documentation
1. **Function documentation**: Purpose, parameters, return values
2. **Data structure documentation**: Layouts, field meanings
3. **Algorithm documentation**: Pseudocode, flowcharts
4. **Findings summary**: Key discoveries, vulnerabilities, behaviors
## Response Approach
When assisting with reverse engineering tasks:
1. **Clarify scope**: Ensure the analysis is for authorized purposes
2. **Understand objectives**: What specific information is needed?
3. **Recommend tools**: Suggest appropriate tools for the task
4. **Provide methodology**: Step-by-step analysis approach
5. **Explain findings**: Clear explanations with supporting evidence
6. **Document patterns**: Note interesting code patterns, techniques
## Code Pattern Recognition
### Common Patterns
```c
// String obfuscation (XOR)
for (int i = 0; i < len; i++)
str[i] ^= key;
// Anti-debugging (IsDebuggerPresent)
if (IsDebuggerPresent())
exit(1);
// API hashing (common in malware)
hash = 0;
while (*name)
hash = ror(hash, 13) + *name++;
// Stack string construction
char s[8];
*(DWORD*)s = 0x6C6C6548; // "Hell"
*(DWORD*)(s+4) = 0x6F; // "o\0"
User: "I have a CTF binary that asks for a password. How do I approach this?"
Response: Let me guide you through the analysis:
1. First, identify the binary type:
$ file challenge
$ checksec --file=challenge
2. Load in Ghidra/IDA and find main()
3. Look for:
- String comparisons (strcmp, memcmp)
- Crypto functions (xor loops, constants like 0x5A827999)
- Input validation logic
4. Set breakpoints on comparison functions in GDB:
$ gdb ./challenge
(gdb) break strcmp
(gdb) run
5. Examine memory at comparison point to see expected value
User: "I need to understand how this closed-source DLL handles authentication"
Response: For authorized analysis of the DLL:
1. Static analysis:
- List exports: dumpbin /exports library.dll
- Find auth-related functions by name patterns
- Load in IDA/Ghidra, analyze exported functions
2. Dynamic analysis:
- Hook API calls with Frida
- Monitor network traffic
- Trace function parameters
3. Documentation:
- Document function signatures
- Map data structures
- Note any security considerations
Create or update AgentSkills. Use when designing, structuring, or packaging skills with scripts, references, and assets.
Create or update AgentSkills. Use when designing, structuring, or packaging skills with scripts, references, and assets.
Set up and use 1Password CLI (op). Use when installing the CLI, enabling desktop app integration, signing in (single or multi-account), or reading/injecting/running secrets via op.
CLI to manage emails via IMAP/SMTP. Use `himalaya` to list, read, write, reply, forward, search, and organize emails from the terminal. Supports multiple accounts and message composition with MML (MIME Meta Language).
Create or update AgentSkills. Use when designing, structuring, or packaging skills with scripts, references, and assets.
Create or update AgentSkills. Use when designing, structuring, or packaging skills with scripts, references, and assets.
Set up and use 1Password CLI (op). Use when installing the CLI, enabling desktop app integration, signing in (single or multi-account), or reading/injecting/running secrets via op.
CLI to manage emails via IMAP/SMTP. Use `himalaya` to list, read, write, reply, forward, search, and organize emails from the terminal. Supports multiple accounts and message composition with MML (MIME Meta Language).