rule win_t34loader_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.t34loader."
        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.t34loader"
        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 = { 488bce 488bd8 e8???????? 488b5610 488bc8 4c8bcf 48895c2420 }
            // n = 7, score = 100
            //   488bce               | inc                 ebp
            //   488bd8               | mov                 eax, edi
            //   e8????????           |                     
            //   488b5610             | mov                 word ptr [ebp + 0x480], ax
            //   488bc8               | xor                 edx, edx
            //   4c8bcf               | dec                 eax
            //   48895c2420           | lea                 ecx, [ebp + 0x482]

        $sequence_1 = { 4863d8 e8???????? 498bd6 488bcd 48895808 e8???????? 4863542420 }
            // n = 7, score = 100
            //   4863d8               | dec                 eax
            //   e8????????           |                     
            //   498bd6               | lea                 eax, [0x48548]
            //   488bcd               | dec                 eax
            //   48895808             | mov                 dword ptr [edi], eax
            //   e8????????           |                     
            //   4863542420           | test                bl, 1

        $sequence_2 = { 488bd7 488d8d00180000 e8???????? 4c8d85e0170000 488d5518 488d8db82a0000 }
            // n = 6, score = 100
            //   488bd7               | mov                 edi, dword ptr [ebp - 0x79]
            //   488d8d00180000       | inc                 esp
            //   e8????????           |                     
            //   4c8d85e0170000       | mov                 ebp, dword ptr [esp + 0x38]
            //   488d5518             | xor                 esi, esi
            //   488d8db82a0000       | dec                 eax

        $sequence_3 = { 488b03 0fb708 6685c9 0f8531ffffff 85ed 7519 498bcf }
            // n = 7, score = 100
            //   488b03               | dec                 eax
            //   0fb708               | mov                 edx, edi
            //   6685c9               | jmp                 0x1ac8
            //   0f8531ffffff         | dec                 eax
            //   85ed                 | mov                 ebx, dword ptr [ebp + 0x70]
            //   7519                 | dec                 eax
            //   498bcf               | add                 ebx, 0x10

        $sequence_4 = { 48896c2418 56 57 4156 4883ec20 498be8 }
            // n = 6, score = 100
            //   48896c2418           | mov                 ebp, dword ptr [esp + 0x60]
            //   56                   | dec                 eax
            //   57                   | add                 esp, 0x20
            //   4156                 | inc                 ecx
            //   4883ec20             | pop                 edi
            //   498be8               | inc                 eax

        $sequence_5 = { eb06 4c8907 418ac1 884708 488b542440 488bcf e8???????? }
            // n = 7, score = 100
            //   eb06                 | dec                 edx
            //   4c8907               | movsx               eax, byte ptr [ecx + ebx + 0x71030]
            //   418ac1               | inc                 edx
            //   884708               | mov                 word ptr [ecx], ds
            //   488b542440           | inc                 eax
            //   488bcf               | adc                 byte ptr [edi], al
            //   e8????????           |                     

        $sequence_6 = { 488d152f210800 488d4c2430 e8???????? cc 8b4110 c3 4883ec28 }
            // n = 7, score = 100
            //   488d152f210800       | jns                 0x1bf2
            //   488d4c2430           | dec                 eax
            //   e8????????           |                     
            //   cc                   | mov                 ecx, edi
            //   8b4110               | test                eax, eax
            //   c3                   | jne                 0x1c1a
            //   4883ec28             | inc                 ecx

        $sequence_7 = { 488b5c2448 48ffc3 48895c2448 4584ed 0f85d4070000 e9???????? 498b06 }
            // n = 7, score = 100
            //   488b5c2448           | mov                 eax, dword ptr [ecx + 0x38]
            //   48ffc3               | je                  0x74d
            //   48895c2448           | test                ecx, ecx
            //   4584ed               | je                  0x745
            //   0f85d4070000         | sub                 ecx, 1
            //   e9????????           |                     
            //   498b06               | je                  0x726

        $sequence_8 = { 41f7d8 1bd2 f7da 83c205 e8???????? 8bf0 85c0 }
            // n = 7, score = 100
            //   41f7d8               | jne                 0x3d5
            //   1bd2                 | mov                 ebx, dword ptr [ebp + 0x2c]
            //   f7da                 | dec                 ecx
            //   83c205               | mov                 edx, esi
            //   e8????????           |                     
            //   8bf0                 | dec                 eax
            //   85c0                 | mov                 ecx, ebp

        $sequence_9 = { 5d c3 488d8a50000000 e9???????? 488d8a78000000 e9???????? 488d8a90000000 }
            // n = 7, score = 100
            //   5d                   | mov                 dword ptr [esi + 0x10], esi
            //   c3                   | dec                 eax
            //   488d8a50000000       | mov                 edx, ebp
            //   e9????????           |                     
            //   488d8a78000000       | dec                 eax
            //   e9????????           |                     
            //   488d8a90000000       | mov                 ecx, esi

    condition:
        7 of them and filesize < 1212416
}