MITRE ATT&CK T1021.002 Windows Admin Share Basic

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 * Copyright 2023 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 mitre_attack_T1021_002_windows_admin_share_basic {

  meta:
    author = "Google Cloud Security"
    description = "Detect the use of net use for SMB/Windows admin shares"
    rule_id = "mr_ceadd402-7315-4462-9716-8b41a6329bdd"
    rule_name = "MITRE ATT&CK T1021.002 Windows Admin Share Basic"
    tactic = "TA0008"
    technique = "T1021.002"
    type = "alert"
    platform = "Windows"
    data_source = "microsoft sysmon, microsoft windows events"
    severity = "Low"
    priority = "Low"

  events:
    $process.metadata.event_type = "PROCESS_LAUNCH"
    $process.target.process.command_line = /net.*use.*(C|ADMIN|IPC)\$/ nocase

  outcome:
    $risk_score = 35
    // added to populate alert graph with additional context
    $principal_hostname = $process.principal.hostname
    $principal_process_pid = $process.principal.process.pid
    $principal_process_command_line = $process.principal.process.command_line
    $principal_process_file_sha256 = $process.principal.process.file.sha256
    $principal_process_file_full_path = $process.principal.process.file.full_path
    $principal_process_product_specific_process_id = $process.principal.process.product_specific_process_id
    $principal_process_parent_process_product_specific_process_id = $process.principal.process.parent_process.product_specific_process_id
    $target_process_pid = $process.target.process.pid
    $target_process_command_line = $process.target.process.command_line
    $target_process_file_sha256 = $process.target.process.file.sha256
    $target_process_file_full_path = $process.target.process.file.full_path
    $target_process_product_specific_process_id = $process.target.process.product_specific_process_id
    $principal_user_userid = $process.principal.user.userid

  condition:
    $process
}