netntlm_downgrade_attack_part_1

rule netntlm_downgrade_attack_part_1 {
 meta:
    author = "Florian Roth"
    description = "Detects post exploitation using NetNTLM downgrade attacks  License: https://github.com/Neo23x0/sigma/blob/master/LICENSE.Detection.Rules.md."
    reference = "https://tdm.socprime.com/tdm/info/XzZiURQ3EeoE"
    version = "0.01"
    created = "2018/03/20"
    product = "windows"
    service = "security"
    mitre = "credential_access, t1212"

  events:
($selection2.metadata.product_event_type = "4657" and (re.regex($selection2.target.registry.registry_value_data, `REGISTRY\\MACHINE\\SYSTEM\\.*ControlSet.*\\Control\\Lsa`) or re.regex($selection2.target.file.full_path, `REGISTRY\\MACHINE\\SYSTEM\\.*ControlSet.*\\Control\\Lsa`)) and ($selection2.target.registry.registry_value_name = "LmCompatibilityLevel" or $selection2.target.registry.registry_value_name = "NtlmMinClientSec" or $selection2.target.registry.registry_value_name = "RestrictSendingNTLMTraffic"))

  condition:
    $selection2
}