MITRE ATT&CK T1570 Suspicious Command PSExec

// Copyright 2023 Google LLC. Licensed under Apache-2.0.

rule mitre_attack_T1570_suspicious_command_psexec {

  meta:
    author = "Google Cloud Security"
    description = "Command-line execution of the PsExec tool on Windows"
    rule_id = "mr_b1c34e7b-79c2-4d44-a105-d8166f6fd2c5"
    rule_name = "MITRE ATT&CK T1570 Suspicious Command PSExec"
    tactic = "TA0008"
    technique = "T1570"
    type = "alert"
    platform = "Windows"
    data_source = "sentinelone"
    severity = "Info"
    priority = "Info"

  events:
    $process.metadata.event_type = "PROCESS_LAUNCH"
    $process.principal.hostname = $hostname
    re.regex($process.principal.process.command_line, `psexec`) nocase

  match:
    $hostname over 5m

  outcome:
    $risk_score = 15
    $event_count = count_distinct($process.metadata.id)
    // added to populate alert graph with additional context
    // Commented out principal.hostname because it is already represented in graph as match variable. If match changes, can uncomment to add to results
    //$principal_hostname = array_distinct($process.principal.hostname)
    $principal_process_pid = array_distinct($process.principal.process.pid)
    $principal_process_command_line = array_distinct($process.principal.process.command_line)
    $principal_process_file_sha256 = array_distinct($process.principal.process.file.sha256)
    $principal_process_file_full_path = array_distinct($process.principal.process.file.full_path)
    $principal_process_product_specific_process_id = array_distinct($process.principal.process.product_specific_process_id)
    $principal_process_parent_process_product_specific_process_id = array_distinct($process.principal.process.parent_process.product_specific_process_id)
    $target_process_pid = array_distinct($process.target.process.pid)
    $target_process_command_line = array_distinct($process.target.process.command_line)
    $target_process_file_sha256 = array_distinct($process.target.process.file.sha256)
    $target_process_file_full_path = array_distinct($process.target.process.file.full_path)
    $target_process_product_specific_process_id = array_distinct($process.target.process.product_specific_process_id)
    $principal_user_userid = array_distinct($process.principal.user.userid)

  condition:
    $process
}