Windows_Rootkit_Ndislan_1cc50535

rule Windows_Rootkit_Ndislan_1cc50535 {
    meta:
        author = "Elastic Security"
        id = "1cc50535-63f2-4052-95e7-008cac3758cf"
        fingerprint = "0ed22d2d7c0c047b679636e29452a3fea9b3c736d057cf5318c16f71366708c8"
        creation_date = "2026-05-22"
        last_modified = "2026-08-10"
        description = "Subject: Anhua Xinda (Beijing) Technology Co., Ltd., Version: <= 6.1.7600.1421"
        threat_name = "Windows.Rootkit.Ndislan"
        reference_sample = "b0eb4d999e4e0e7c2e33ff081e847c87b49940eb24a9e0794c6aa9516832c427"
        severity = 50
        arch_context = "x86"
        scan_context = "file"
        license = "Elastic License v2"
        os = "windows"
    strings:
        $subject_name = { 06 03 55 04 03 [2] 41 6E 68 75 61 20 58 69 6E 64 61 20 28 42 65 69 6A 69 6E 67 29 20 54 65 63 68 6E 6F 6C 6F 67 79 20 43 6F 2E 2C 20 4C 74 64 2E }
        $original_file_name = { 4F 00 72 00 69 00 67 00 69 00 6E 00 61 00 6C 00 46 00 69 00 6C 00 65 00 6E 00 61 00 6D 00 65 00 00 00 6E 00 64 00 69 00 73 00 6C 00 61 00 6E 00 2E 00 73 00 79 00 73 00 00 00 }
        $version = /V\x00S\x00_\x00V\x00E\x00R\x00S\x00I\x00O\x00N\x00_\x00I\x00N\x00F\x00O\x00\x00\x00{0,4}\xbd\x04\xef\xfe[\x00-\xff]{4}([\x00-\xff][\x00-\xff][\x00-\x05][\x00-\x00][\x00-\xff][\x00-\xff][\x00-\xff][\x00-\xff]|[\x00-\x00][\x00-\x00][\x06-\x06][\x00-\x00][\x00-\xff][\x00-\xff][\x00-\xff][\x00-\xff]|[\x01-\x01][\x00-\x00][\x06-\x06][\x00-\x00][\x00-\xff][\x00-\xff]([\x00-\xff][\x00-\x00]|[\x00-\xff][\x01-\x1c]|[\x00-\xaf][\x1d-\x1d])|[\x01-\x01][\x00-\x00][\x06-\x06][\x00-\x00]([\x00-\xff][\x00-\x00]|[\x00-\xff][\x01-\x04]|[\x00-\x8c][\x05-\x05])[\xb0-\xb0][\x1d-\x1d]|[\x01-\x01][\x00-\x00][\x06-\x06][\x00-\x00][\x8d-\x8d][\x05-\x05][\xb0-\xb0][\x1d-\x1d])/
        $str1 = { 4D 00 69 00 63 00 72 00 6F 00 73 00 6F 00 66 00 74 00 AE 00 20 00 57 00 69 00 6E 00 64 00 6F 00 77 00 73 00 AE 00 20 00 4F 00 70 00 65 00 72 00 61 00 74 00 69 00 6E 00 67 00 20 00 53 00 79 00 73 00 74 00 65 00 6D 00 }
        $str2 = "MS LAN Driver" wide
    condition:
        int16(uint32(0x3C) + 0x5c) == 0x0001 and int16(uint32(0x3C) + 0x18) == 0x020b and $subject_name and $original_file_name and $version and $str1 and $str2
}