本文へ移動
cccskills
無料GitHub で公開

reverse-engineering-arm-binaries

Reverse engineers ARM/AArch64 malware by identifying the architecture and instruction set state (ARM/Thumb), parsing ELF/Mach-O ARM headers, and orienting analysis around the ARM calling convention. Activates for requests to reverse ARM binaries, analyze AArch64 malware, or handle ARM/Thumb instruction-set decoding.

インストール方法を見る

含まれるファイル(4)

  • SKILL.md2.7 KB
  • LICENSE340 B
  • references/api-reference.md1.2 KB
  • scripts/analyst.py2.5 KB

SKILL.md(原文)

インストールする前に、エージェントに与えられる指示の中身を確認できます。

Reverse Engineering ARM Binaries

When to Use

  • You have an ARM (32-bit) or AArch64 (64-bit) binary — IoT/mobile/Linux malware — and need to identify the architecture, instruction-set state, and entry point before disassembly.
  • You need to handle ARM/Thumb interworking correctly.

Do not use an x86 mindset for calling conventions/registers — ARM differs. This skill reads the binary statically and executes nothing.

Prerequisites

  • The ARM binary (ELF or Mach-O), read inertly. Capstone optional for instruction decoding.

Safety & Handling

  • Read bytes statically; analyze on an isolated host (and emulate via QEMU separately if needed).

Workflow

Step 1: Identify architecture and format

python scripts/analyst.py identify sample.bin

Parses ELF/Mach-O headers to report ARM vs AArch64, endianness, entry point, and (for ELF) whether the entry is Thumb (low bit set in e_entry or $t mapping symbols).

Step 2: Set the correct disassembly mode

Disassemble AArch64 as A64; for 32-bit ARM, switch between ARM and Thumb per the entry/mapping symbols.

Step 3: Orient around the calling convention

Track arguments in r0-r3/x0-x7, return in r0/x0, and syscalls via svc with the syscall number in r7/x8.

Step 4: Proceed with analysis

Identify functions, strings, and syscalls; pair with emulation if dynamic insight is needed.

Validation

  • Architecture (ARM/AArch64) and endianness are read from the header.
  • The entry point and ARM/Thumb state are reported.
  • Disassembly mode matches the detected state.

Pitfalls

  • Missing Thumb state and decoding Thumb as ARM (garbage output).
  • Big-endian ARM (rare but real) mis-parsed as little-endian.
  • Statically linked musl/uClibc inflating the function set on IoT samples.

References

レビュー

まだレビューはありません。使ってみた感想をお寄せください。

同じリポジトリのスキル

概要と使いどころ

Reverses Android malware: unpacking APKs, decompiling DEX bytecode to readable Java, auditing the manifest for abused permissions and components, and locating dynamically loaded or native payloads. Activates for requests to analyze an APK, decompile DEX, or investigate a suspicious Android app.

日本語の概要は準備中です。原文の説明を表示しています。

meltedinhex/analyst-ai-pack212026年7月7日 更新

Analyzes API call traces from a sandbox or API monitor (JSON) to group calls by category, reconstruct high-level behaviors (process injection, file drops, network, crypto), and flag suspicious call sequences. Activates for requests to analyze an API trace, interpret sandbox API logs, or identify behavior from Win32/Native API calls.

日本語の概要は準備中です。原文の説明を表示しています。

meltedinhex/analyst-ai-pack212026年7月7日 更新

Analyzes Windows Authenticode signatures on PE files: checking for a signature, reading the signer certificate chain, detecting revoked/expired/stolen certs, and recognizing signature-stripping and catalog-signing abuse. Activates for requests to analyze a code signature, verify Authenticode, or assess signer trust on a PE.

日本語の概要は準備中です。原文の説明を表示しています。

meltedinhex/analyst-ai-pack212026年7月7日 更新

Analyzes banking trojan webinject configurations to extract targeted institutions, injected JavaScript/HTML, and data-theft hooks, mapping the fraud workflow. Activates for requests to analyze banking trojan webinjects, parse a webinject config, or map targeted banks and credential-theft injections.

日本語の概要は準備中です。原文の説明を表示しています。

meltedinhex/analyst-ai-pack212026年7月7日 更新

Analyzes Python-based malware packaged as PyInstaller/py2exe executables by detecting the packer, locating the embedded archive, and identifying bundled .pyc modules for extraction and decompilation. Activates for requests to analyze compiled Python malware, unpack a PyInstaller binary, or extract pyc modules from a frozen Python executable.

日本語の概要は準備中です。原文の説明を表示しています。

meltedinhex/analyst-ai-pack212026年7月7日 更新

Analyzes cryptojacking/coinminer malware by extracting mining pool endpoints (stratum), wallet addresses, algorithm and miner identifiers (XMRig and forks), and persistence or resource-control settings from static strings and config. Activates for requests to analyze a cryptominer, extract mining pool and wallet IOCs, or identify coinminer configuration.

日本語の概要は準備中です。原文の説明を表示しています。

meltedinhex/analyst-ai-pack212026年7月7日 更新

meltedinhex のスキルをすべて見る

このスキルの問題を報告する