Windows_Rootkit_Yundian_d49a7777

rule Windows_Rootkit_Yundian_d49a7777 {
    meta:
        author = "Elastic Security"
        id = "d49a7777-36c0-4e59-9fd3-e85eb54575a1"
        fingerprint = "6651543334aee6fbe2e31389c2090c09bac7f5c6b400f9ad56906e62774d8585"
        creation_date = "2026-05-22"
        last_modified = "2026-08-10"
        description = "Subject: Shenzhen yundian Technology Co., Ltd"
        threat_name = "Windows.Rootkit.Yundian"
        reference_sample = "4fc254af8ebfa6fc1050f65c17015b39b36693b58f029c2fa1873976cbca52df"
        severity = 50
        arch_context = "x86"
        scan_context = "file"
        license = "Elastic License v2"
        os = "windows"
    strings:
        $subject_name = { 06 03 55 04 03 [2] 53 68 65 6E 7A 68 65 6E 20 79 75 6E 64 69 61 6E 20 54 65 63 68 6E 6F 6C 6F 67 79 20 43 6F 2E 2C 20 4C 74 64 }
        $str1 = "KILLER.pdb"
    condition:
        int16(uint32(0x3C) + 0x5c) == 0x0001 and int16(uint32(0x3C) + 0x18) == 0x020b and $subject_name and $str1
}