renamed_createdump_utility_execution

rule renamed_createdump_utility_execution {

  meta:
    author = "Florian Roth (Nextron Systems)"
    description = "Detects uses of a renamed legitimate createdump.exe LOLOBIN utility to dump process memory"
    reference = "https://github.com/SigmaHQ/sigma/blob/master/rules/windows/process_creation/proc_creation_win_renamed_createdump.yml"
    license = "https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md"
    rule_name = "Renamed CreateDump Utility Execution"
    sigma_uuid = "1a1ed54a-2ba4-4221-94d5-01dee560d71e"
    sigma_status = "test"
    rule_id = "mr_d680d855-18b0-4a96-9844-1a1e41a239c9"
    tactic = "TA0006"
    technique = "T1003.001"
    type = "Detection"
    data_source = "Sysmon"
    platform = "Windows"
    severity = "High"
    priority = "High"
    false_positives = "Command lines that use the same flags"

  events:
    $process.metadata.event_type = "PROCESS_LAUNCH"
    (
        (
            $process.src.process.file.full_path = "FX_VER_INTERNALNAME_STR" nocase
        )
        or
        (
            strings.contains($process.target.process.command_line, " -u ") and
            strings.contains($process.target.process.command_line, " -f ") and
            strings.contains($process.target.process.command_line, ".dmp")
        )
        or
        (
            strings.contains($process.target.process.command_line, " --full ") and
            strings.contains($process.target.process.command_line, " --name ") and
            strings.contains($process.target.process.command_line, ".dmp")
        )
    )
    NOT re.regex($process.target.process.file.full_path, `\\createdump\.exe$`) nocase

    $process.principal.hostname = $hostname

  match:
    $hostname over 5m

  outcome:
    //example usage of specifying test user and hostname to adjust risk score
    $risk_score = max(if($process.principal.user.userid = "user" and $process.principal.hostname = "hostname", 0, 15))
    $principal_process_pid = array_distinct($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)
    $principal_process_product_specfic_process_id = array_distinct($process.principal.process.product_specific_process_id)
    $principal_process_parent_process_product_specfic_process_id = array_distinct($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)
    $target_process_product_specfic_process_id = array_distinct($process.target.process.product_specific_process_id)
    $principal_user_userid = array_distinct($process.principal.user.userid)
    $log_type = array_distinct(strings.concat($process.metadata.log_type,"/",$process.metadata.product_event_type))

  condition:
    $process
}