def rule(event):
    if any(
        [
            event.deep_get("c-useragent", default="").startswith("Q2hyb21l"),
            event.deep_get("c-useragent", default="").startswith("QXBwbGVXZWJLaX"),
            event.deep_get("c-useragent", default="").startswith("RGFsdmlr"),
            event.deep_get("c-useragent", default="").startswith("TW96aWxsY"),
        ]
    ):
        return True
    return False
