malware_apt_grizzly_steppe_user_agent

/*
 * Copyright 2021 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES 
OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

rule malware_apt_grizzly_steppe_user_agent
{
  meta:
    author = "Google Cloud Security"
    description = "HTTP user-agent noted in the Grizzly Steppe report - TA0011"
    reference = "https://us-cert.cisa.gov/sites/default/files/publications/AR-17-20045_Enhanced_Analysis_of_GRIZZLY_STEPPE_Activity.pdf"
    yara_version = "YL2.0"
    rule_version = "1.0"

  events:
    $e1.network.http.user_agent = "Mozilla/5.0 (Windows NT 6.; WOW64; rv:20.0) Gecko/20100101 Firefox/20.0"

  condition:
    $e1
}