rule win_aytoke_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.aytoke."
        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.aytoke"
        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 = { 40 84c9 75f9 2bc2 03f0 33ff 0fbe0e }
            // n = 7, score = 200
            //   40                   | inc                 eax
            //   84c9                 | test                cl, cl
            //   75f9                 | jne                 0xfffffffb
            //   2bc2                 | sub                 eax, edx
            //   03f0                 | add                 esi, eax
            //   33ff                 | xor                 edi, edi
            //   0fbe0e               | movsx               ecx, byte ptr [esi]

        $sequence_1 = { 1e 1f 2021 2223 244d 4d 4d }
            // n = 7, score = 200
            //   1e                   | push                ds
            //   1f                   | pop                 ds
            //   2021                 | and                 byte ptr [ecx], ah
            //   2223                 | and                 ah, byte ptr [ebx]
            //   244d                 | and                 al, 0x4d
            //   4d                   | dec                 ebp
            //   4d                   | dec                 ebp

        $sequence_2 = { 8d85ecfcffff 8d5001 8a08 40 84c9 }
            // n = 5, score = 200
            //   8d85ecfcffff         | lea                 eax, [ebp - 0x314]
            //   8d5001               | lea                 edx, [eax + 1]
            //   8a08                 | mov                 cl, byte ptr [eax]
            //   40                   | inc                 eax
            //   84c9                 | test                cl, cl

        $sequence_3 = { 68???????? e8???????? be01000000 83c404 }
            // n = 4, score = 200
            //   68????????           |                     
            //   e8????????           |                     
            //   be01000000           | mov                 esi, 1
            //   83c404               | add                 esp, 4

        $sequence_4 = { e9???????? 33c0 8bff 0fb78884384100 }
            // n = 4, score = 200
            //   e9????????           |                     
            //   33c0                 | xor                 eax, eax
            //   8bff                 | mov                 edi, edi
            //   0fb78884384100       | movzx               ecx, word ptr [eax + 0x413884]

        $sequence_5 = { 33f6 a1???????? 8b0d???????? 8b15???????? 8985a8f9ffff 8d85bcf9ffff }
            // n = 6, score = 200
            //   33f6                 | xor                 esi, esi
            //   a1????????           |                     
            //   8b0d????????         |                     
            //   8b15????????         |                     
            //   8985a8f9ffff         | mov                 dword ptr [ebp - 0x658], eax
            //   8d85bcf9ffff         | lea                 eax, [ebp - 0x644]

        $sequence_6 = { 881438 46 47 ebd7 8b8dd8fbffff }
            // n = 5, score = 200
            //   881438               | mov                 byte ptr [eax + edi], dl
            //   46                   | inc                 esi
            //   47                   | inc                 edi
            //   ebd7                 | jmp                 0xffffffd9
            //   8b8dd8fbffff         | mov                 ecx, dword ptr [ebp - 0x428]

        $sequence_7 = { 8d55ec 52 b902000000 56 8945f0 66894dec ff15???????? }
            // n = 7, score = 200
            //   8d55ec               | lea                 edx, [ebp - 0x14]
            //   52                   | push                edx
            //   b902000000           | mov                 ecx, 2
            //   56                   | push                esi
            //   8945f0               | mov                 dword ptr [ebp - 0x10], eax
            //   66894dec             | mov                 word ptr [ebp - 0x14], cx
            //   ff15????????         |                     

        $sequence_8 = { 40 83f816 72ee 33c0 5d c3 8b04c54c494100 }
            // n = 7, score = 200
            //   40                   | inc                 eax
            //   83f816               | cmp                 eax, 0x16
            //   72ee                 | jb                  0xfffffff0
            //   33c0                 | xor                 eax, eax
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   8b04c54c494100       | mov                 eax, dword ptr [eax*8 + 0x41494c]

        $sequence_9 = { 83e61f 8d3c8d00c44100 8b0f c1e606 833c0eff 7535 }
            // n = 6, score = 200
            //   83e61f               | and                 esi, 0x1f
            //   8d3c8d00c44100       | lea                 edi, [ecx*4 + 0x41c400]
            //   8b0f                 | mov                 ecx, dword ptr [edi]
            //   c1e606               | shl                 esi, 6
            //   833c0eff             | cmp                 dword ptr [esi + ecx], -1
            //   7535                 | jne                 0x37

    condition:
        7 of them and filesize < 425984
}