Analyzing Position Independent Code
Analyzes position-independent code and shellcode by identifying GetPC/PEB-walk
Install
$ agentstack add skill-meltedinhex-analyst-ai-pack-analyzing-position-independent-code ✓ scanned · ✓ verified, works with Claude Code, Cursor, and more.
Security review
✓ PassedNo 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 No
- ✓ 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.
Verified badge
Passed review? Show it. Paste this badge into your README, it links to the public security report.
Links to your public security report.[](https://agentstack.voostack.com/security/report/skill-meltedinhex-analyst-ai-pack-analyzing-position-independent-code) Reliability & compatibility
Declared compatibility
Compatibility is declared by the source manifest. End-to-end runtime verification is coming, see below.
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Analyzing Position-Independent Code
When to Use
- You have a PIC blob/shellcode that resolves its own addresses and APIs without imports, and you
need to understand its technique before disassembly.
- You want to identify the base-resolution (GetPC), PEB-walk, and API-hashing mechanics.
Do not use this to execute the code — analyze it statically (and emulate separately if needed). Treat the blob as malicious.
Prerequisites
- The PIC/shellcode blob (read inertly).
Safety & Handling
- Read bytes statically; store the blob password-protected and never execute it.
Workflow
Step 1: Identify PIC techniques
python scripts/analyst.py analyze shellcode.binDetects GetPC stubs (call $+5/fnstenv), PEB access (fs:[30]/gs:[60]), API-hash loops (lodsb + ror), and stack-string construction.
Step 2: Determine architecture and base behavior
Confirm 32- vs 64-bit PEB access and how the code computes its own base for relative addressing.
Step 3: Map API resolution
Note the hashing algorithm and that resolved APIs are obtained by walking the PEB→LDR→export tables (pair with the API-hash resolver skill).
Step 4: Disassemble at the right base
Load the blob at the inferred base/entry in a disassembler/emulator and proceed.
Validation
- PIC technique hits reference real patterns (GetPC/PEB/API-hash), not arbitrary bytes.
- Architecture is consistent with the PEB-access form detected.
- The analysis points to a concrete entry/base for disassembly.
Pitfalls
- Encoded/staged shellcode where the PIC patterns appear only after decoding.
- Mixed 32/64-bit (WoW64) transitions.
- Custom GetPC variants not matching common signatures.
References
- See [
references/api-reference.md](references/api-reference.md) for the analyzer. - PEB/LDR and ATT&CK T1027.007 references (linked in frontmatter).
Source & license
This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.
- Author: meltedinhex
- Source: meltedinhex/analyst-ai-pack
- License: Apache-2.0
- Homepage: https://meltedinhex.com/
Install and usage instructions live in the source repository linked above.
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Versions
- v0.1.0 Imported from the upstream source.