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mraptor is a tool designed to detect most malicious VBA Macros using generic heuristics. Unlike antivirus engines, it does not rely on signatures.
In a nutshell, mraptor detects keywords corresponding to the three following types of behaviour that are present in clear text in almost any macro malware:
- A: Auto-execution trigger
- W: Write to the file system or memory
- X: Execute a file or any payload outside the VBA context
mraptor considers that a macro is suspicious when A and (W or X) is true.
For more information about mraptor's detection algorithm, see the article How to detect most malicious macros without an antivirus.
mraptor can be used either as a command-line tool, or as a python module from your own applications.
It is part of the python-oletools package.
Usage: mraptor.py [options] <filename> [filename2 ...] Options: -h, --help show this help message and exit -r find files recursively in subdirectories. -z ZIP_PASSWORD, --zip=ZIP_PASSWORD if the file is a zip archive, open all files from it, using the provided password (requires Python 2.6+) -f ZIP_FNAME, --zipfname=ZIP_FNAME if the file is a zip archive, file(s) to be opened within the zip. Wildcards * and ? are supported. (default:*) -l LOGLEVEL, --loglevel=LOGLEVEL logging level debug/info/warning/error/critical (default=warning) -m, --matches Show matched strings. An exit code is returned based on the analysis result: - 0: No Macro - 1: Not MS Office - 2: Macro OK - 10: ERROR - 20: SUSPICIOUS
Scan a single file:
Scan a single file, stored in a Zip archive with password "infected":
mraptor.py malicious_file.xls.zip -z infected
Scan a collection of files stored in a folder:
Important: on Linux/MacOSX, always add double quotes around a file name when you use
wildcards such as
?. Otherwise, the shell may replace the argument with the actual
list of files matching the wildcards before starting the script.
Python 3 support - mraptor3
As of v0.50, mraptor has been ported to Python 3 thanks to @sebdraven. However, the differences between Python 2 and 3 are significant and for now there is a separate version of mraptor named mraptor3 to be used with Python 3.
How to use mraptor in Python applications