Windows_Ransomware_Ryuk_6c726744

rule Windows_Ransomware_Ryuk_6c726744 : beta {
    meta:
        author = "Elastic Security"
        id = "6c726744-acdb-443a-b683-b11f8b657f7a"
        fingerprint = "d0a4608907e48d02d78ff40a59d47cad1b9258df31b7312dd1a85f8fee2a28d5"
        creation_date = "2020-04-30"
        last_modified = "2021-08-23"
        description = "Identifies RYUK ransomware"
        threat_name = "Windows.Ransomware.Ryuk"
        reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.ryuk"
        severity = 100
        arch_context = "x86, arm64"
        scan_context = "file, memory"
        license = "Elastic License v2"
        os = "windows"
    strings:
        $a1 = "172.16." ascii fullword
        $a2 = "192.168." ascii fullword
        $a3 = "DEL /F" wide fullword
        $a4 = "lsaas.exe" wide fullword
        $a5 = "delete[]" ascii fullword
    condition:
        4 of ($a*)
}