Windows_VulnDriver_Biostar_dad1bbdb

rule Windows_VulnDriver_Biostar_dad1bbdb {
    meta:
        author = "Elastic Security"
        id = "dad1bbdb-b5c6-4fb1-99e1-1c062f1f3ad4"
        fingerprint = "2167eeda9399712fb95a3190aa084ecc8ca10829129fca7deb3bfffc22f24b5c"
        creation_date = "2026-05-22"
        last_modified = "2026-06-25"
        description = "Subject: BIOSTAR MICROTECH INT'L CORP, Version: <= 1.1.0.0"
        threat_name = "Windows.VulnDriver.Biostar"
        reference_sample = "f929bead59e9424ab90427b379dcdd63fbfe0c4fb5e1792e3a1685541cd5ec65"
        severity = 50
        arch_context = "x86"
        scan_context = "file"
        license = "Elastic License v2"
        os = "windows"
    strings:
        $subject_name = { 06 03 55 04 03 [2] 42 49 4F 53 54 41 52 20 4D 49 43 52 4F 54 45 43 48 20 49 4E 54 27 4C 20 43 4F 52 50 }
        $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 42 00 53 00 5F 00 49 00 32 00 63 00 49 00 6F 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-\x00][\x00-\x00][\x00-\xff][\x00-\xff][\x00-\xff][\x00-\xff]|[\x00-\x00][\x00-\x00][\x01-\x01][\x00-\x00][\x00-\xff][\x00-\xff][\x00-\xff][\x00-\xff]|[\x01-\x01][\x00-\x00][\x01-\x01][\x00-\x00][\x00-\x00][\x00-\x00][\x00-\x00][\x00-\x00])/
        $str1 = "BSMEMx64.pdb"
        $str2 = "BIOSTAR I/O driver fle" wide
        $str3 = "I/O Interface driver file" 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 and $str3
}