rule win_october_seventh_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.october_seventh."
        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.october_seventh"
        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 = { 8b3c87 03fb 8bc7 5f 5e }
            // n = 5, score = 100
            //   8b3c87               | mov                 edi, dword ptr [edi + eax*4]
            //   03fb                 | add                 edi, ebx
            //   8bc7                 | mov                 eax, edi
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi

        $sequence_1 = { 27 25fe75be5c b3b3 1b5c0d7f e09e a2???????? }
            // n = 6, score = 100
            //   27                   | daa                 
            //   25fe75be5c           | and                 eax, 0x5cbe75fe
            //   b3b3                 | mov                 bl, 0xb3
            //   1b5c0d7f             | sbb                 ebx, dword ptr [ebp + ecx + 0x7f]
            //   e09e                 | loopne              0xffffffa0
            //   a2????????           |                     

        $sequence_2 = { 6bc838 8b0495d08fd500 885c0828 ff36 }
            // n = 4, score = 100
            //   6bc838               | imul                ecx, eax, 0x38
            //   8b0495d08fd500       | mov                 eax, dword ptr [edx*4 + 0xd58fd0]
            //   885c0828             | mov                 byte ptr [eax + ecx + 0x28], bl
            //   ff36                 | push                dword ptr [esi]

        $sequence_3 = { 83c801 85c0 740b 8b4df8 46 3b75f0 }
            // n = 6, score = 100
            //   83c801               | or                  eax, 1
            //   85c0                 | test                eax, eax
            //   740b                 | je                  0xd
            //   8b4df8               | mov                 ecx, dword ptr [ebp - 8]
            //   46                   | inc                 esi
            //   3b75f0               | cmp                 esi, dword ptr [ebp - 0x10]

        $sequence_4 = { 8bc6 c1e002 50 8b85a8f8ffff 0fb7048544cb4100 8d048540c24100 50 }
            // n = 7, score = 100
            //   8bc6                 | mov                 eax, esi
            //   c1e002               | shl                 eax, 2
            //   50                   | push                eax
            //   8b85a8f8ffff         | mov                 eax, dword ptr [ebp - 0x758]
            //   0fb7048544cb4100     | movzx               eax, word ptr [eax*4 + 0x41cb44]
            //   8d048540c24100       | lea                 eax, [eax*4 + 0x41c240]
            //   50                   | push                eax

        $sequence_5 = { 6a00 8bf0 6a00 56 8975f8 ff15???????? 6a00 }
            // n = 7, score = 100
            //   6a00                 | push                0
            //   8bf0                 | mov                 esi, eax
            //   6a00                 | push                0
            //   56                   | push                esi
            //   8975f8               | mov                 dword ptr [ebp - 8], esi
            //   ff15????????         |                     
            //   6a00                 | push                0

        $sequence_6 = { 75e4 33c0 eb0a 8b7610 eb9c 1bc0 }
            // n = 6, score = 100
            //   75e4                 | jne                 0xffffffe6
            //   33c0                 | xor                 eax, eax
            //   eb0a                 | jmp                 0xc
            //   8b7610               | mov                 esi, dword ptr [esi + 0x10]
            //   eb9c                 | jmp                 0xffffff9e
            //   1bc0                 | sbb                 eax, eax

        $sequence_7 = { ff35???????? 6a00 6a14 ff15???????? }
            // n = 4, score = 100
            //   ff35????????         |                     
            //   6a00                 | push                0
            //   6a14                 | push                0x14
            //   ff15????????         |                     

        $sequence_8 = { 8945f4 f7c10000ffff 7521 8b7210 0fb7c9 3bce 7213 }
            // n = 7, score = 100
            //   8945f4               | mov                 dword ptr [ebp - 0xc], eax
            //   f7c10000ffff         | test                ecx, 0xffff0000
            //   7521                 | jne                 0x23
            //   8b7210               | mov                 esi, dword ptr [edx + 0x10]
            //   0fb7c9               | movzx               ecx, cx
            //   3bce                 | cmp                 ecx, esi
            //   7213                 | jb                  0x15

        $sequence_9 = { 46 8b0485d08fd500 884c072b 83fa03 7511 8b45fc 8a0e }
            // n = 7, score = 100
            //   46                   | inc                 esi
            //   8b0485d08fd500       | mov                 eax, dword ptr [eax*4 + 0xd58fd0]
            //   884c072b             | mov                 byte ptr [edi + eax + 0x2b], cl
            //   83fa03               | cmp                 edx, 3
            //   7511                 | jne                 0x13
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   8a0e                 | mov                 cl, byte ptr [esi]

    condition:
        7 of them and filesize < 19859456
}