Vendor-native detections for T1183

rule ryuk_ransomware_persistence_mechanism_detection {
 meta:
    author = "Furkan Celik"
    description = "Ryuk adds the following registry key so it will execute at every login. It uses the command below to create a registry key  License: https://github.com/Neo23x0/sigma/blob/master/LICENSE.Detection.Rules.md."
    reference = "https://tdm.socprime.com/tdm/info/vQwDMgA92Or3"
    version = "0.01"
    created = "2020/03/30"
    product = "windows"
    service = "security"
    mitre = "persistence, T1183"

  events:
($selection.target.process.command_line = "C:\\Windows\\System32\\cmd.exe\" /C REG ADD \"HKEY_CURRENT_USER\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Run\"" or re.regex($selection.target.process.command_line, `/v \"svchos\" /t REG_SZ /d \"C:\\Users\\Public.*\.exe\" /f`))

  condition:
    $selection
}