process_dump_via_comsvcs_dll

rule process_dump_via_comsvcs_dll {
 meta:
    author = "Modexp (idea)"
    description = "Detects process memory dump via comsvcs.dll and rundll32  License: https://github.com/Neo23x0/sigma/blob/master/LICENSE.Detection.Rules.md."
    reference = "https://tdm.socprime.com/tdm/info/BnuWbd1VgHGv"
    version = "0.01"
    created = "2019/09/02"
    category = "process_creation"
    product = "windows"
    mitre = "credential_access, t1003"

  events:
((re.regex($rundll_image.target.process.file.full_path, `.*\\rundll32\.exe`) or $rundll_image.target.file.full_path = "RUNDLL32.EXE") and ((re.regex($rundll_image.target.process.command_line, `.*comsvcs.*MiniDump.*full.*`) or re.regex($rundll_image.target.process.command_line, `.*comsvcs.*MiniDumpW.*full.*`)) and ($rundll_image.metadata.product_event_type = "4688" or $rundll_image.metadata.product_event_type = "1")))

  condition:
    $rundll_image
}