Abhi / AbhiTheModder

Mobile security researcher and reverse engineer focused on Android internals, application security, Dalvik/Smali, Flutter/Dart, Frida/Pine instrumentation, radare2, and Termux-first tooling.

I build tools around the problems I hit while reversing: DEX and Smali exploration, runtime hooking, APK analysis, Android-native YARA, radare2 workflows, and automation for repeatable mobile security work.

Occasionally dabbling in web security.

Research Focus

• Android application security assessments, obfuscated APK reversing, malware behavior analysis, and threat intelligence.
• Dalvik bytecode, Smali, ART runtime behavior, Java/Kotlin Android internals, JNI, native code, and Flutter/Dart AOT analysis.
• Dynamic analysis and instrumentation with Frida, PineHook, radare2, custom agents, and Android/Termux-native workflows.
• Reverse-engineering tooling, security automation, and AI/MCP-assisted analysis pipelines.

Public Research

• CVE-2026-33989: arbitrary file write via path traversal in @mobilenext/mobile-mcp, fixed in 0.0.49 and published through GHSA-3p2m-h2v6-g9mx.
• CVE-2026-33989 writeup: technical analysis of mobile_save_screenshot and mobile_start_screen_recording path handling in a mobile MCP server.
• r2con2025 talk: Accessing r2 from anywhere anytime.
• Research notes and writeups: Android reversing, Flutter SSL analysis, Dart AOT internals, Frida on Termux, Smali patching, signature matching, and CTF writeups.

Selected Work

RevEngi

• RevEngiBot: Telegram-based reverse-engineering toolkit.
• revengi-app: Flutter app for Smali grammar, DexRepair, Flutter analysis, Blutter integration, APK tooling, and related workflows.
• RevEngi docs: documentation for the bot, API, and app.
• yarax_android: native Android JNI bindings for yara-x.

Android, Smali, and DEX

• understand-smali: learning and reference material for Smali and Android bytecode.
• smalisp: lightweight Smali language server with definitions and completion.
• smalig: Dalvik/Smali bytecode grammar and information fetch tool.
• java2smali: command-line tool for compiling Java into Smali.
• MT-NotepadPlus: Smali syntax highlighting for Notepad++.

Runtime Instrumentation

• PineHookPlus: PineHook-based helper for hooking classes and methods with less repeated code.
• Fine: Pine and Frida integration experiments around Android component factory behavior.
• NewPineExample: Pine hook proof of concept using the Android android:name manifest attribute.
• frida-python: Frida Python bindings variant with devkit support.
• frida-agent-api: lightweight Frida agent compiler and API.

Binary Analysis and radare2

• r2web: web interface for accessing radare2 from anywhere.
• warrp: native radare2 plugin for Binary Ninja WARP signatures.
• nyxstone-r2: nyxstone assembler plugin for radare2.
• r2garlic: Android/DEX decompiler work around radare2.

Termux, Automation, and APIs

• termux-scripts: scripts for installing and using reverse-engineering tools on Android/Termux.
• termux-hermes: build notes and releases for Hermes on Termux.
• blutter-termux: maintained Termux-oriented B(l)utter workflow with enhancements.
• dex2c: maintained method-based Dalvik bytecode to JNI native code compiler.
• apksearch: APK search engine.
• playstoreapi: unofficial Google Play Store API wrapper in Python.
• pyxamstore: unpack and repack Xamarin assembly store blobs, including V2 and V3 formats.
• LYADI: MCP server for reverse-engineering assistance, with an Android/Termux focus.

Writing

My blog is qbtau.in, where I publish technical notes on Android reversing, Flutter/Dart internals, Frida, Smali, mobile tooling, CVEs, and CTFs.

Recent topics include:

• Building Frida natively on Android/Termux.
• Matching Java classes and methods across APK versions.
• Identifying ssl_verify_peer_cert in Android Flutter binaries.
• Overriding Android constructor parameter defaults at runtime.
• Dart object pool behavior on ARM64 and ARM32.

Links

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