claude-config/skills/android-reverse.md

Android Reverse Engineering Skill

Installed Tools

• adb (Android Debug Bridge)
• fastboot
• apktool 2.11.1
• jadx 1.4.7 (CLI and GUI)
• apksigner
• zipalign

Common Workflows

APK Analysis

# Decompile APK
apktool d app.apk -o app_decompiled

# Recompile APK
apktool b app_decompiled -o app_modified.apk

# Sign APK
apksigner sign --ks keystore.jks app_modified.apk

# Analyze with JADX GUI
jadx-gui app.apk

# Analyze with JADX CLI
jadx -d output_dir app.apk

ADB Commands

adb devices                        # List devices
adb shell                          # Open shell
adb install app.apk                # Install APK
adb uninstall com.package.name     # Uninstall
adb logcat                         # View logs
adb pull /sdcard/file.txt .        # Download file
adb push file.txt /sdcard/         # Upload file
adb shell pm list packages         # List installed packages

APK Modification

# Full workflow
apktool d original.apk -o work_dir
# ... modify smali/resources ...
apktool b work_dir -o unsigned.apk
zipalign -v 4 unsigned.apk aligned.apk
apksigner sign --ks mykey.jks aligned.apk

Tool Locations

• apktool: /opt/tools/apktool
• jadx: /opt/tools/jadx/bin/jadx
• jadx-gui: /opt/tools/jadx/bin/jadx-gui

Security Notes

• Always verify APK signatures before installation
• Use isolated environment for unknown APKs
• Be careful with modified APKs - they can bypass security