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analyzing-position-independent-code

Analyzes position-independent code and shellcode by identifying GetPC/PEB-walk techniques, API-hash resolution loops, and relocation-free addressing so the payload can be disassembled at the right base. Activates for requests to analyze position-independent code, identify PIC techniques, or understand how shellcode resolves APIs without imports.

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See how to install

Files included (4)

  • SKILL.md2.8 KB
  • LICENSE340 B
  • references/api-reference.md1.1 KB
  • scripts/analyst.py1.9 KB

SKILL.md (original)

Review the instructions the agent will receive before you install.

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.bin

Detects 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

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