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.
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Via pip
pip install pyamsi -
Clone repository
git clone https://github.com/Tomiwa-Ot/py-amsi.git cd py-amsi/ python setup.py install
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) |