rule win_mm_core_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        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 = "20260422"
        malpedia_hash = "a182e35da64e6d71cb55f125c4d4225196523f14"
        malpedia_version = "20260504"
        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 = { b9ff0f0000 8dbc24f8080000 e8???????? 83c410 8bcf 51 ffd3 }
            // n = 7, score = 200
            //   b9ff0f0000           | mov                 ecx, 0xfff
            //   8dbc24f8080000       | lea                 edi, [esp + 0x8f8]
            //   e8????????           |                     
            //   83c410               | add                 esp, 0x10
            //   8bcf                 | mov                 ecx, edi
            //   51                   | push                ecx
            //   ffd3                 | call                ebx

        $sequence_1 = { 8945e4 83f805 7d10 668b4c4310 66890c4524220110 }
            // n = 5, score = 200
            //   8945e4               | mov                 dword ptr [ebp - 0x1c], eax
            //   83f805               | cmp                 eax, 5
            //   7d10                 | jge                 0x12
            //   668b4c4310           | mov                 cx, word ptr [ebx + eax*2 + 0x10]
            //   66890c4524220110     | mov                 word ptr [eax*2 + 0x10012224], cx

        $sequence_2 = { 6a03 57 57 50 51 }
            // n = 5, score = 200
            //   6a03                 | push                3
            //   57                   | push                edi
            //   57                   | push                edi
            //   50                   | push                eax
            //   51                   | push                ecx

        $sequence_3 = { 0f84df030000 8b542420 8b44240c 8d4c2414 51 53 6a01 }
            // n = 7, score = 200
            //   0f84df030000         | je                  0x3e5
            //   8b542420             | mov                 edx, dword ptr [esp + 0x20]
            //   8b44240c             | mov                 eax, dword ptr [esp + 0xc]
            //   8d4c2414             | lea                 ecx, [esp + 0x14]
            //   51                   | push                ecx
            //   53                   | push                ebx
            //   6a01                 | push                1

        $sequence_4 = { 8b54241c 8d0c32 3b4c2418 761f c1e90a 41 }
            // n = 6, score = 200
            //   8b54241c             | mov                 edx, dword ptr [esp + 0x1c]
            //   8d0c32               | lea                 ecx, [edx + esi]
            //   3b4c2418             | cmp                 ecx, dword ptr [esp + 0x18]
            //   761f                 | jbe                 0x21
            //   c1e90a               | shr                 ecx, 0xa
            //   41                   | inc                 ecx

        $sequence_5 = { 6a00 50 e8???????? 83c40c 33c0 33c9 8d542408 }
            // n = 7, score = 200
            //   6a00                 | push                0
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   33c0                 | xor                 eax, eax
            //   33c9                 | xor                 ecx, ecx
            //   8d542408             | lea                 edx, [esp + 8]

        $sequence_6 = { 6a00 68???????? 8d8c2430010000 51 }
            // n = 4, score = 200
            //   6a00                 | push                0
            //   68????????           |                     
            //   8d8c2430010000       | lea                 ecx, [esp + 0x130]
            //   51                   | push                ecx

        $sequence_7 = { 33c0 eb1a 8bc8 83e01f c1f905 8b0c8d40400110 c1e006 }
            // n = 7, score = 200
            //   33c0                 | xor                 eax, eax
            //   eb1a                 | jmp                 0x1c
            //   8bc8                 | mov                 ecx, eax
            //   83e01f               | and                 eax, 0x1f
            //   c1f905               | sar                 ecx, 5
            //   8b0c8d40400110       | mov                 ecx, dword ptr [ecx*4 + 0x10014040]
            //   c1e006               | shl                 eax, 6

        $sequence_8 = { ffd6 895c241c 895c2418 8b442424 8b2d???????? 50 53 }
            // n = 7, score = 200
            //   ffd6                 | call                esi
            //   895c241c             | mov                 dword ptr [esp + 0x1c], ebx
            //   895c2418             | mov                 dword ptr [esp + 0x18], ebx
            //   8b442424             | mov                 eax, dword ptr [esp + 0x24]
            //   8b2d????????         |                     
            //   50                   | push                eax
            //   53                   | push                ebx

        $sequence_9 = { 51 ffd3 8bf0 8b442414 85c0 }
            // n = 5, score = 200
            //   51                   | push                ecx
            //   ffd3                 | call                ebx
            //   8bf0                 | mov                 esi, eax
            //   8b442414             | mov                 eax, dword ptr [esp + 0x14]
            //   85c0                 | test                eax, eax

    condition:
        7 of them and filesize < 319488
}