rule win_winordll64_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.winordll64."
        info = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.6.0"
        signator_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.winordll64"
        malpedia_rule_date = "20260916"
        malpedia_hash = "53a643781c18e08f4a50949af60172d837a0b6f6"
        malpedia_version = "20260917"
        malpedia_license = "CC BY-SA 4.0"
        malpedia_sharing = "TLP:WHITE"

    /* DISCLAIMER
     * The strings used in this rule have been automatically selected from the
     * disassembly of memory dumps and unpacked files, using YARA-Signator.
     * The code and documentation is published here:
     * https://github.com/fxb-cocacoding/yara-signator
     * As Malpedia is used as data source, please note that for a given
     * number of families, only single samples are documented.
     * This likely impacts the degree of generalization these rules will offer.
     * Take the described generation method also into consideration when you
     * apply the rules in your use cases and assign them confidence levels.
     */


    strings:
        $sequence_0 = { 85c0 0f856dffffff 498bcd ff15???????? 488d9328020000 }
            // n = 5, score = 100
            //   85c0                 | dec                 ebp
            //   0f856dffffff         | test                esp, esp
            //   498bcd               | je                  0x26e
            //   ff15????????         |                     
            //   488d9328020000       | dec                 ecx

        $sequence_1 = { 488bcf e8???????? 90 48837db808 7209 }
            // n = 5, score = 100
            //   488bcf               | jbe                 0xd16
            //   e8????????           |                     
            //   90                   | dec                 esp
            //   48837db808           | mov                 eax, edx
            //   7209                 | dec                 ecx

        $sequence_2 = { 488d4d80 492bce 488bc6 48f7e9 4c8be2 }
            // n = 5, score = 100
            //   488d4d80             | dec                 eax
            //   492bce               | mov                 eax, dword ptr [esp + 0x58]
            //   488bc6               | dec                 eax
            //   48f7e9               | lea                 edx, [ebp + 0x210]
            //   4c8be2               | dec                 eax

        $sequence_3 = { 488d4c2470 e8???????? 488d55d0 498bce ff15???????? 33d2 }
            // n = 6, score = 100
            //   488d4c2470           | mov                 ecx, ebx
            //   e8????????           |                     
            //   488d55d0             | dec                 eax
            //   498bce               | cmp                 ebx, edi
            //   ff15????????         |                     
            //   33d2                 | jne                 0x1f0

        $sequence_4 = { 8bcf 4885d2 7413 66393a 740e }
            // n = 5, score = 100
            //   8bcf                 | inc                 esp
            //   4885d2               | cmp                 dword ptr [esp + 0x30], esp
            //   7413                 | inc                 ebp
            //   66393a               | cmova               eax, esp
            //   740e                 | test                eax, eax

        $sequence_5 = { 480f42f0 4883c8ff 492bc0 483bc6 770d 488d0d41090100 }
            // n = 6, score = 100
            //   480f42f0             | push                esi
            //   4883c8ff             | inc                 ecx
            //   492bc0               | push                edi
            //   483bc6               | dec                 eax
            //   770d                 | lea                 ebp, [eax - 0x6e8]
            //   488d0d41090100       | dec                 eax

        $sequence_6 = { 4883f8ff 7507 33c0 e9???????? 488bc8 ff15???????? 4883c9ff }
            // n = 7, score = 100
            //   4883f8ff             | dec                 eax
            //   7507                 | mov                 ebx, dword ptr [esp + 0xa0]
            //   33c0                 | xor                 edi, edi
            //   e9????????           |                     
            //   488bc8               | dec                 ebp
            //   ff15????????         |                     
            //   4883c9ff             | mov                 ebp, ecx

        $sequence_7 = { 7412 ba11000000 eb10 4883c204 e8???????? }
            // n = 5, score = 100
            //   7412                 | mov                 edi, dword ptr [esp + 0x68]
            //   ba11000000           | dec                 eax
            //   eb10                 | mov                 ebx, dword ptr [esp + 0x60]
            //   4883c204             | dec                 esp
            //   e8????????           |                     

        $sequence_8 = { 488d0c7f 48c1e102 e8???????? 488bd8 4889442458 4885c0 7532 }
            // n = 7, score = 100
            //   488d0c7f             | mov                 ecx, esp
            //   48c1e102             | dec                 eax
            //   e8????????           |                     
            //   488bd8               | add                 dword ptr [edi + 0x100], eax
            //   4889442458           | dec                 eax
            //   4885c0               | mov                 eax, dword ptr [esp + 0x40]
            //   7532                 | dec                 eax

        $sequence_9 = { 8bda 488bf9 83faff 7518 33db 4885c9 7411 }
            // n = 7, score = 100
            //   8bda                 | dec                 eax
            //   488bf9               | mov                 eax, edx
            //   83faff               | and                 edx, 0x1f
            //   7518                 | dec                 eax
            //   33db                 | sar                 eax, 5
            //   4885c9               | dec                 eax
            //   7411                 | imul                edx, edx, 0x58

    condition:
        7 of them and filesize < 278528
}