def rule(event):
    if all(
        [
            event.deep_get("type", default="") == "EXECVE",
            event.deep_get("a0", default="") == "steghide",
            event.deep_get("a1", default="") == "embed",
            event.deep_get("a2", default="") in ["-cf", "-ef"],
            event.deep_get("a4", default="") in ["-cf", "-ef"],
        ]
    ):
        return True
    return False
