possible_ransomware_or_unauthorized_mbr_modifications

rule possible_ransomware_or_unauthorized_mbr_modifications {
 meta:
    author = "@neu5ron"
    description = "Detects, possibly, malicious unauthorized usage of bcdedit.exe  License: https://github.com/Neo23x0/sigma/blob/master/LICENSE.Detection.Rules.md."
    reference = "https://tdm.socprime.com/tdm/info/MQ4AnLs4Jrnq"
    version = "0.01"
    created = "2019/02/07"
    category = "process_creation"
    product = "windows"
    mitre = "defense_evasion, t1070, persistence, t1067"

  events:
(re.regex($selection.target.process.command_line, `.*\\bcdedit\.exe`) and (re.regex($selection.target.process.command_line, `.*delete.*`) or re.regex($selection.target.process.command_line, `.*deletevalue.*`) or re.regex($selection.target.process.command_line, `.*import.*`)) and ($selection.metadata.product_event_type = "4688" or $selection.metadata.product_event_type = "1"))

  condition:
    $selection
}