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analyzing-pe-imports-and-exports

Analyzes a PE file's import and export tables to infer capability: mapping imported APIs to behaviors (networking, crypto, injection, persistence), spotting dynamic-resolution stubs, and reading exports of malicious DLLs. Activates for requests to analyze PE imports, inspect the IAT/exports, or infer capability from API usage.

한국어 요약은 준비 중입니다. 원문 설명을 표시하고 있습니다.

설치 방법 보기

포함된 파일(4)

  • SKILL.md3.1 KB
  • LICENSE340 B
  • references/api-reference.md1.1 KB
  • scripts/analyst.py3.0 KB

SKILL.md(원문)

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Analyzing PE Imports and Exports

When to Use

  • You have a Windows PE and want a fast capability read from its imported APIs.
  • You need to identify suspicious API clusters (injection, crypto, anti-analysis) before deeper reversing.
  • You are inspecting a malicious DLL's exports to find its callable entry points.

Do not use the import table alone as a verdict — packers stub imports and malware resolves APIs dynamically; a thin IAT can hide real capability.

Prerequisites

  • pefile (pip install pefile); the sample handled inertly in the lab.

Safety & Handling

  • Parse the PE statically; never run it during import analysis.
  • Keep the sample password-protected at rest and reference it by hash.

Workflow

Step 1: Parse imports

Enumerate imported DLLs and functions from the import directory (IAT). A sparse IAT plus a GetProcAddress/LoadLibrary pair suggests dynamic resolution.

python scripts/analyst.py imports sample.exe

Step 2: Map APIs to behaviors

Cluster imports into behavior buckets: networking (Ws2_32, WinINet), process/injection (VirtualAllocEx, WriteProcessMemory, CreateRemoteThread), crypto (Crypt*, bcrypt), persistence (Reg*, service APIs), and anti-analysis (IsDebuggerPresent).

Step 3: Inspect exports

For DLLs, list exports (by name and ordinal). Unusual export names or a single exported DllRegisterServer/ordinal hint at how the module is invoked.

Step 4: Flag dynamic resolution

Note LoadLibrary/GetProcAddress, ordinal-only imports, and tiny IATs as signs that the real capability is resolved at runtime — escalate to dynamic/RE workflows.

Validation

  • Import behavior buckets are consistent with other static signals (strings, sections).
  • A thin or stubbed IAT is recognized as a packing/dynamic-resolution indicator, not "benign".
  • Exports of a malicious DLL are enumerated with their invocation method identified.

Pitfalls

  • Trusting a small IAT as low-capability when imports are resolved dynamically.
  • Ignoring delay-load and bound imports.
  • Reading ordinal-only imports without resolving them to function names.

References

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