thinkingmalware/actionscript3

Tools for static and dynamic analysis of ActionScript3 SWF files.

ActionScript3 IDA Pro

Hex-Rays IDA Pro Plug-In Contest 2018

Author: Boris Larin

This repository contains the SWF Loader, ActionScript3 processor module, and a debugger assist plugin named KLFDB.

Requirements

IDA Pro 7.1 (Tested with IDA Pro 7.1.180227)

Installation

Copy files into the IDA Pro directory:

• 'swf.py' to 'loaders' subfolder
• 'klfdb.py' to 'plugins' subfolder
• 'as3.py' to 'procs' subfolder

Usage

Drag and drop the SWF file to IDA Pro and select the Shockwave Flash loader.

Use 'File' -> 'Produce file' -> 'Create MAP file...' to generate a map file for use with KLFDB.

KLFDB is written to work with 32-bit versions of Stand Alone Flash and with Flash for Browsers (Internet Explorer is currently supported).

To debug the SWF file with Internet Explorer, load the Adobe Flash module (e.g. c:\Windows\System32\Macromed\Flash\Flash32__**.ocx) into IDA Pro.

Use 'Edit' -> 'Klfdb' -> 'Load new map file' to load the generated map file.

From this point, it is possible to use 'Edit' -> 'Klfdb' -> 'Set breakpoints on ...' to set breakpoints on methods.

After setting breakpoints, attach to the Internet Explorer process that is about to start the SWF file and use 'Edit' -> 'Klfdb' -> 'Run'. After that, allow the Flash file to execute.

The plugin will suspend execution of Adobe Flash after the breakpoint hit and will transparently fill just-in-time compiled native code with useful comments about the original bytecode.

Acknowledgements

• RABCDAsm
• JPEXS Free Flash Decompiler