rule win_mm_core_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.mm_core."
        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.mm_core"
        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 = { 55 8bec 8b4508 33c9 3b04cd30b60010 7413 }
            // n = 6, score = 200
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   33c9                 | xor                 ecx, ecx
            //   3b04cd30b60010       | cmp                 eax, dword ptr [ecx*8 + 0x1000b630]
            //   7413                 | je                  0x15

        $sequence_1 = { e8???????? 85c0 753b 8d0424 50 }
            // n = 5, score = 200
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   753b                 | jne                 0x3d
            //   8d0424               | lea                 eax, [esp]
            //   50                   | push                eax

        $sequence_2 = { 6a08 89442428 51 89442428 89442430 897c242c }
            // n = 6, score = 200
            //   6a08                 | push                8
            //   89442428             | mov                 dword ptr [esp + 0x28], eax
            //   51                   | push                ecx
            //   89442428             | mov                 dword ptr [esp + 0x28], eax
            //   89442430             | mov                 dword ptr [esp + 0x30], eax
            //   897c242c             | mov                 dword ptr [esp + 0x2c], edi

        $sequence_3 = { 33c0 0fbe84c180e20010 6a07 c1f804 59 8985a4fbffff 3bc1 }
            // n = 7, score = 200
            //   33c0                 | xor                 eax, eax
            //   0fbe84c180e20010     | movsx               eax, byte ptr [ecx + eax*8 + 0x1000e280]
            //   6a07                 | push                7
            //   c1f804               | sar                 eax, 4
            //   59                   | pop                 ecx
            //   8985a4fbffff         | mov                 dword ptr [ebp - 0x45c], eax
            //   3bc1                 | cmp                 eax, ecx

        $sequence_4 = { 7442 833e00 743d 8b4608 40 50 }
            // n = 6, score = 200
            //   7442                 | je                  0x44
            //   833e00               | cmp                 dword ptr [esi], 0
            //   743d                 | je                  0x3f
            //   8b4608               | mov                 eax, dword ptr [esi + 8]
            //   40                   | inc                 eax
            //   50                   | push                eax

        $sequence_5 = { ebb0 8b55b8 8955c8 64a130000000 8945d4 8b4dd4 8b510c }
            // n = 7, score = 200
            //   ebb0                 | jmp                 0xffffffb2
            //   8b55b8               | mov                 edx, dword ptr [ebp - 0x48]
            //   8955c8               | mov                 dword ptr [ebp - 0x38], edx
            //   64a130000000         | mov                 eax, dword ptr fs:[0x30]
            //   8945d4               | mov                 dword ptr [ebp - 0x2c], eax
            //   8b4dd4               | mov                 ecx, dword ptr [ebp - 0x2c]
            //   8b510c               | mov                 edx, dword ptr [ecx + 0xc]

        $sequence_6 = { 3db7000000 7415 6888130000 ff15???????? e8???????? e8???????? }
            // n = 6, score = 200
            //   3db7000000           | cmp                 eax, 0xb7
            //   7415                 | je                  0x17
            //   6888130000           | push                0x1388
            //   ff15????????         |                     
            //   e8????????           |                     
            //   e8????????           |                     

        $sequence_7 = { 85d2 7437 8b4ddc 8b55d4 }
            // n = 4, score = 200
            //   85d2                 | test                edx, edx
            //   7437                 | je                  0x39
            //   8b4ddc               | mov                 ecx, dword ptr [ebp - 0x24]
            //   8b55d4               | mov                 edx, dword ptr [ebp - 0x2c]

        $sequence_8 = { 57 ff15???????? 8bf0 85f6 7422 c60600 0fbe07 }
            // n = 7, score = 200
            //   57                   | push                edi
            //   ff15????????         |                     
            //   8bf0                 | mov                 esi, eax
            //   85f6                 | test                esi, esi
            //   7422                 | je                  0x24
            //   c60600               | mov                 byte ptr [esi], 0
            //   0fbe07               | movsx               eax, byte ptr [edi]

        $sequence_9 = { 8b442434 3bc3 7413 8b15???????? 50 }
            // n = 5, score = 200
            //   8b442434             | mov                 eax, dword ptr [esp + 0x34]
            //   3bc3                 | cmp                 eax, ebx
            //   7413                 | je                  0x15
            //   8b15????????         |                     
            //   50                   | push                eax

    condition:
        7 of them and filesize < 319488
}