Py-Amsi - Scan Strings Or Files For Malware Using The Windows Antimalware Scan Interface

py-amsi is a library that scans strings or files for malware using the Windows Antimalware Scan Interface (AMSI) API. AMSI is an interface native to Windows that allows applications to ask the antivirus installed on the system to analyse a file/string. AMSI is not tied to Windows Defender. Antivirus providers implement the AMSI interface to receive calls from applications. This library takes advantage of the API to make antivirus scans in python. Read more about the Windows AMSI API here.

Installation

Via pip
```
pip install pyamsi
```

Clone repository

git clone https://github.com/Tomiwa-Ot/py-amsi.git
cd py-amsi/
python setup.py install

Usage

dictionary of the format # { # 'Sample Size' : 68, // The string/file size in bytes # 'Risk Level' : 0, // The risk level as suggested by the antivirus # 'Message' : 'File is clean' // Response message # }" dir="auto">

from pyamsi import Amsi

# Scan a file
Amsi.scan_file(file_path, debug=True) # debug is optional and False by default

# Scan string
Amsi.scan_string(string, string_name, debug=False) # debug is optional and False by default

# Both functions return a dictionary of the format
# {
#     'Sample Size' : 68,         // The string/file size in bytes
#     'Risk Level' : 0,           // The risk level as suggested by the antivirus
#     'Message' : 'File is clean' // Response message
# }

Risk Level	Meaning
0	AMSI_RESULT_CLEAN (File is clean)
1	AMSI_RESULT_NOT_DETECTED (No threat detected)
16384	AMSI_RESULT_BLOCKED_BY_ADMIN_START (Threat is blocked by the administrator)
20479	AMSI_RESULT_BLOCKED_BY_ADMIN_END (Threat is blocked by the administrator)
32768	AMSI_RESULT_DETECTED (File is considered malware)