rule win_mechanical_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        version = "1"
        description = "Detects win.mechanical."
        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.mechanical"
        malpedia_rule_date = "20230705"
        malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41"
        malpedia_version = "20230715"
        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 = { 03c7 3bca 72ed 5f }
            // n = 4, score = 200
            //   03c7                 | add                 eax, edi
            //   3bca                 | cmp                 ecx, edx
            //   72ed                 | jb                  0xffffffef
            //   5f                   | pop                 edi

        $sequence_1 = { 033485c0e54200 8b45e4 8b00 8906 }
            // n = 4, score = 200
            //   033485c0e54200       | add                 esi, dword ptr [eax*4 + 0x42e5c0]
            //   8b45e4               | mov                 eax, dword ptr [ebp - 0x1c]
            //   8b00                 | mov                 eax, dword ptr [eax]
            //   8906                 | mov                 dword ptr [esi], eax

        $sequence_2 = { 448b442464 4533c9 4c8d15eb3afeff 41bb00020000 4c898c2498000000 eb1d 488bb424a8000000 }
            // n = 7, score = 200
            //   448b442464           | inc                 esp
            //   4533c9               | mov                 byte ptr [esp + 0x38c0], ah
            //   4c8d15eb3afeff       | xor                 edx, edx
            //   41bb00020000         | inc                 ecx
            //   4c898c2498000000     | mov                 eax, 0x103
            //   eb1d                 | inc                 esp
            //   488bb424a8000000     | mov                 byte ptr [esp + 0x1280], ah

        $sequence_3 = { 03c1 1bc9 0bc1 59 e9???????? e8???????? ff742404 }
            // n = 7, score = 200
            //   03c1                 | add                 eax, ecx
            //   1bc9                 | sbb                 ecx, ecx
            //   0bc1                 | or                  eax, ecx
            //   59                   | pop                 ecx
            //   e9????????           |                     
            //   e8????????           |                     
            //   ff742404             | push                dword ptr [esp + 4]

        $sequence_4 = { 8b442430 488d8c24c1380000 33d2 41b803010000 4488a424c0380000 488905???????? }
            // n = 6, score = 200
            //   8b442430             | lea                 ebx, [0x20d7d]
            //   488d8c24c1380000     | dec                 ecx
            //   33d2                 | mov                 ecx, esp
            //   41b803010000         | dec                 ecx
            //   4488a424c0380000     | mov                 edx, ebx
            //   488905????????       |                     

        $sequence_5 = { 0401 3cbe 8844240b 76e2 }
            // n = 4, score = 200
            //   0401                 | add                 al, 1
            //   3cbe                 | cmp                 al, 0xbe
            //   8844240b             | mov                 byte ptr [esp + 0xb], al
            //   76e2                 | jbe                 0xffffffe4

        $sequence_6 = { 03ce c6840c3801000000 8d8424a05c0000 33f6 }
            // n = 4, score = 200
            //   03ce                 | add                 ecx, esi
            //   c6840c3801000000     | mov                 byte ptr [esp + ecx + 0x138], 0
            //   8d8424a05c0000       | lea                 eax, [esp + 0x5ca0]
            //   33f6                 | xor                 esi, esi

        $sequence_7 = { 4533c0 33d2 33c9 4889742420 e8???????? 4c8d0557980000 }
            // n = 6, score = 200
            //   4533c0               | dec                 eax
            //   33d2                 | lea                 ecx, [esp + 0x38c1]
            //   33c9                 | xor                 edx, edx
            //   4889742420           | inc                 ecx
            //   e8????????           |                     
            //   4c8d0557980000       | mov                 eax, 0x103

        $sequence_8 = { e8???????? 488d8c24fb060000 33d2 41b8e5640000 }
            // n = 4, score = 200
            //   e8????????           |                     
            //   488d8c24fb060000     | dec                 eax
            //   33d2                 | mov                 dword ptr [esp + 0x20], esi
            //   41b8e5640000         | dec                 esp

        $sequence_9 = { 00686c 42 0023 d18a0688078a }
            // n = 4, score = 200
            //   00686c               | add                 byte ptr [eax + 0x6c], ch
            //   42                   | inc                 edx
            //   0023                 | add                 byte ptr [ebx], ah
            //   d18a0688078a         | ror                 dword ptr [edx - 0x75f877fa], 1

        $sequence_10 = { 030495c0e54200 eb05 b8???????? f6400420 }
            // n = 4, score = 200
            //   030495c0e54200       | add                 eax, dword ptr [edx*4 + 0x42e5c0]
            //   eb05                 | jmp                 7
            //   b8????????           |                     
            //   f6400420             | test                byte ptr [eax + 4], 0x20

        $sequence_11 = { 4983c101 4d85c0 75eb 4183f922 0f85b8000000 488bc8 0fb601 }
            // n = 7, score = 200
            //   4983c101             | dec                 ecx
            //   4d85c0               | add                 ecx, 1
            //   75eb                 | dec                 ebp
            //   4183f922             | test                eax, eax
            //   0f85b8000000         | jne                 0xffffffed
            //   488bc8               | inc                 ecx
            //   0fb601               | cmp                 ecx, 0x22

        $sequence_12 = { 033485c0e54200 c745e401000000 33db 395e08 }
            // n = 4, score = 200
            //   033485c0e54200       | add                 esi, dword ptr [eax*4 + 0x42e5c0]
            //   c745e401000000       | mov                 dword ptr [ebp - 0x1c], 1
            //   33db                 | xor                 ebx, ebx
            //   395e08               | cmp                 dword ptr [esi + 8], ebx

        $sequence_13 = { 33d2 41b803010000 4488a42480120000 488905???????? e8???????? 4c8d1d73310200 }
            // n = 6, score = 200
            //   33d2                 | movzx               eax, byte ptr [edx]
            //   41b803010000         | dec                 eax
            //   4488a42480120000     | add                 edx, 1
            //   488905????????       |                     
            //   e8????????           |                     
            //   4c8d1d73310200       | mov                 eax, dword ptr [esp + 0x30]

        $sequence_14 = { eb17 c6025e eb12 c6022f eb0d c6023f }
            // n = 6, score = 200
            //   eb17                 | dec                 esp
            //   c6025e               | lea                 ebx, [0x23173]
            //   eb12                 | inc                 ebp
            //   c6022f               | xor                 eax, eax
            //   eb0d                 | xor                 edx, edx
            //   c6023f               | xor                 ecx, ecx

        $sequence_15 = { 4c8d1d7d0d0200 498bcc 498bd3 0fb602 4883c201 }
            // n = 5, score = 200
            //   4c8d1d7d0d0200       | jne                 0xbe
            //   498bcc               | dec                 eax
            //   498bd3               | mov                 ecx, eax
            //   0fb602               | movzx               eax, byte ptr [ecx]
            //   4883c201             | dec                 esp

    condition:
        7 of them and filesize < 434176
}