nazywam / AutoIt-Ripper

Extract AutoIt scripts embedded in PE binaries

AutoIt-Ripper

What is this

This is a short python script that allows for extraction of "compiled" AutoIt scripts from PE executables.

References

This script is heavily based on 3 resources, definitely check them out if you want to dig a bit deeper into AutoIt stuff:

• http://files.planet-dl.org/Cw2k/MyAutToExe/index.html
  • Github mirror I
  • Github mirror II
• https://github.com/sujuhu/autoit
• https://github.com/Cisco-Talos/clamav-devel/blob/31824a659dff37ae03e3419395bb68e659c2b165/libclamav/autoit.c

Supported AutoIt versions

Ready:

• EA05 AutoIt3.00
• EA06 AutoIt3.26

Unknown:

• JB01 AutoHotKey
• JB01 AutoIT2

Installation

python3 -m pip install autoit-ripper

or, if you'd like to install the version from sources:

git clone https://github.com/nazywam/AutoIt-Ripper.git
cd AutoIt-Ripper
pip install .

Running

From a python script:

from autoit_ripper import extract, AutoItVersion

with open("sample.exe", "rb") as f:
    file_content = f.read()

# EA05 for v3.00+, EA06 for v3.26+
# Omitting `version` or passing None will try both versions
content_list = extract(data=file_content, version=AutoItVersion.EA06)

From the commandline:

autoit-ripper sample.exe out_directory

Help message:

autoit-ripper --help
usage: autoit-ripper [-h] [--verbose] [--ea {EA05,EA06,guess}] file output_dir

positional arguments:
  file                  input binary
  output_dir            output directory

optional arguments:
  -h, --help            show this help message and exit
  --verbose, -v
  --ea {EA05,EA06,guess}
                        extract a specific version of AutoIt script (default: guess)

Format documentation

(In progress)

AU3 header

Field	Length	encryption (EA05)	encryption (EA06)	Notes
"FILE"	4	MT(0x16FA)	LAME(0x18EE)	static string
flag	4	xor(0x29BC)	xor(0xADBC)
auto_str	flag (* 2)	MT(0xA25E + flag)	LAME(0xB33F + flag)	UTF-8/UTF-16
path_len	4	xor(0x29AC)	xor(0xF820)
path	path_len (* 2)	MT(0xF25E + path_len)	LAME(0xF479 + path_len)	Path of the compiled script
compressed	1	None	None	is the script compressed
data_size	4	xor(0x45AA)	xor(0x87BC)	compressed data size
code_size	4	xor(0x45AA)	xor(0x87BC)	uncompressed data size
crc	4	xor(0xC3D2)	xor(0xA685)	compressed data crc checksum
creation date	4	None	None	file creation date (high)
creation date	4	None	None	file creation date (low)
last update date	4	None	None	last edit date (high)
last update date	4	None	None	last edit date (low)
data	data_size	MT(checksum + 0x22af)	LAME(0x2477)	script data

Differences between v3.00 and v3.26+

	v3.00	v3.26
Code storage	greped by magic	"SCRIPT" resource (/greped by magic?)
String encoding	UTF-8	UTF-16
Encryption	xor/custom MT19937	xor/LAME crypt
Code encryption key	dynamic	static
Compression	yes	yes
Code "compilation"	no	yes
Magic	EA05	EA06