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resolving-dynamic-api-hashing

Resolves dynamically hashed Windows API names by brute-forcing observed hash constants against a wordlist of API/DLL names using common malware hashing algorithms (ROR13, djb2, FNV, CRC32). Activates for requests to resolve API hashes, identify hashed imports, or reverse an API hashing routine.

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查看安装方法

包含的文件(4)

  • SKILL.md2.6 KB
  • LICENSE340 B
  • references/api-reference.md1.2 KB
  • scripts/analyst.py3.3 KB

SKILL.md(原文)

安装前可以查看交给 AI 代理的指令内容。

Resolving Dynamic API Hashing

When to Use

  • A sample resolves APIs by hash (no plaintext import names) and you have the hash constants from disassembly.
  • You need to map each hash back to an API/DLL name to understand functionality.

Do not use this to execute the resolver — it computes hashes over a name wordlist statically and matches them to your observed constants.

Prerequisites

  • The hash constants observed in the binary and (optionally) a names wordlist.

Workflow

Step 1: Identify the algorithm

python scripts/analyst.py id 0x6A4ABC5B

Computes the constant under each supported algorithm against a built-in seed list to suggest which algorithm/seed reproduces known API hashes.

Step 2: Resolve hashes against a wordlist

python scripts/analyst.py resolve hashes.txt --algo ror13 --wordlist names.txt

Brute-forces the provided hashes against the wordlist using the chosen algorithm and reports matches.

Step 3: Annotate the disassembly

Label resolved call sites with their API names to recover behavior.

Step 4: Document the routine

Record the algorithm, seed/initial value, and any key so the routine is reusable.

Validation

  • The chosen algorithm reproduces at least one known API hash (sanity anchor).
  • Resolved names are real exported symbols of plausible DLLs.
  • Unresolved hashes are reported, not silently dropped.

Pitfalls

  • Wrong endianness/rotation direction producing no matches — try variants.
  • Algorithms seeded with a per-sample key; without the key, matches fail.
  • Case sensitivity: some routines hash uppercased names, others as-is.

References

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