rule win_combos_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.combos."
        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.combos"
        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 = { 49 83c9f8 41 7406 894c240c eb23 c744240c08000000 }
            // n = 7, score = 100
            //   49                   | dec                 ecx
            //   83c9f8               | or                  ecx, 0xfffffff8
            //   41                   | inc                 ecx
            //   7406                 | je                  8
            //   894c240c             | mov                 dword ptr [esp + 0xc], ecx
            //   eb23                 | jmp                 0x25
            //   c744240c08000000     | mov                 dword ptr [esp + 0xc], 8

        $sequence_1 = { 895de0 895de4 895dd8 895dfc }
            // n = 4, score = 100
            //   895de0               | mov                 dword ptr [ebp - 0x20], ebx
            //   895de4               | mov                 dword ptr [ebp - 0x1c], ebx
            //   895dd8               | mov                 dword ptr [ebp - 0x28], ebx
            //   895dfc               | mov                 dword ptr [ebp - 4], ebx

        $sequence_2 = { 83e01f c1f905 8d04c0 8b0c8d201b0110 8a448104 }
            // n = 5, score = 100
            //   83e01f               | and                 eax, 0x1f
            //   c1f905               | sar                 ecx, 5
            //   8d04c0               | lea                 eax, [eax + eax*8]
            //   8b0c8d201b0110       | mov                 ecx, dword ptr [ecx*4 + 0x10011b20]
            //   8a448104             | mov                 al, byte ptr [ecx + eax*4 + 4]

        $sequence_3 = { 51 53 8b95d8feffff 52 ff15???????? 85c0 0f8424010000 }
            // n = 7, score = 100
            //   51                   | push                ecx
            //   53                   | push                ebx
            //   8b95d8feffff         | mov                 edx, dword ptr [ebp - 0x128]
            //   52                   | push                edx
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   0f8424010000         | je                  0x12a

        $sequence_4 = { e8???????? 83ee08 33f8 56 57 }
            // n = 5, score = 100
            //   e8????????           |                     
            //   83ee08               | sub                 esi, 8
            //   33f8                 | xor                 edi, eax
            //   56                   | push                esi
            //   57                   | push                edi

        $sequence_5 = { 81ee00010000 8a11 81ee00010000 c1e803 }
            // n = 4, score = 100
            //   81ee00010000         | sub                 esi, 0x100
            //   8a11                 | mov                 dl, byte ptr [ecx]
            //   81ee00010000         | sub                 esi, 0x100
            //   c1e803               | shr                 eax, 3

        $sequence_6 = { c1f804 8b9c9600030000 8a51ff 0bfb }
            // n = 4, score = 100
            //   c1f804               | sar                 eax, 4
            //   8b9c9600030000       | mov                 ebx, dword ptr [esi + edx*4 + 0x300]
            //   8a51ff               | mov                 dl, byte ptr [ecx - 1]
            //   0bfb                 | or                  edi, ebx

        $sequence_7 = { 57 e8???????? 33d8 83ee08 56 53 e8???????? }
            // n = 7, score = 100
            //   57                   | push                edi
            //   e8????????           |                     
            //   33d8                 | xor                 ebx, eax
            //   83ee08               | sub                 esi, 8
            //   56                   | push                esi
            //   53                   | push                ebx
            //   e8????????           |                     

        $sequence_8 = { 894c240c eb23 c744240c08000000 eb19 }
            // n = 4, score = 100
            //   894c240c             | mov                 dword ptr [esp + 0xc], ecx
            //   eb23                 | jmp                 0x25
            //   c744240c08000000     | mov                 dword ptr [esp + 0xc], 8
            //   eb19                 | jmp                 0x1b

        $sequence_9 = { aa 8d9e50120110 803b00 8bcb 742c 8a5101 84d2 }
            // n = 7, score = 100
            //   aa                   | stosb               byte ptr es:[edi], al
            //   8d9e50120110         | lea                 ebx, [esi + 0x10011250]
            //   803b00               | cmp                 byte ptr [ebx], 0
            //   8bcb                 | mov                 ecx, ebx
            //   742c                 | je                  0x2e
            //   8a5101               | mov                 dl, byte ptr [ecx + 1]
            //   84d2                 | test                dl, dl

    condition:
        7 of them and filesize < 163840
}