rule win_mechanical_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        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 = "20230124"
        malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686"
        malpedia_version = "20230125"
        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                 esi, dword ptr [eax*4 + 0x42e5c0]
            //   3bca                 | mov                 dword ptr [ebp - 0x1c], 1
            //   72ed                 | xor                 ebx, ebx
            //   5f                   | cmp                 dword ptr [esi + 8], ebx

        $sequence_1 = { 83f85c 0f8778010000 4898 0fb68428d4590100 }
            // n = 4, score = 200
            //   83f85c               | dec                 eax
            //   0f8778010000         | lea                 edx, [esp + 0x5680]
            //   4898                 | dec                 eax
            //   0fb68428d4590100     | mov                 ecx, edi

        $sequence_2 = { 4585c0 0f84d0010000 488d942440300000 458bc8 66666690 }
            // n = 5, score = 200
            //   4585c0               | jne                 0xfffffff6
            //   0f84d0010000         | dec                 eax
            //   488d942440300000     | lea                 ecx, [esp + 0x5240]
            //   458bc8               | dec                 ebp
            //   66666690             | mov                 eax, esp

        $sequence_3 = { 03c1 1bc9 0bc1 59 e9???????? e8???????? ff742404 }
            // n = 7, score = 200
            //   03c1                 | push                0xfa0
            //   1bc9                 | add                 esi, dword ptr [eax*4 + 0x42e5c0]
            //   0bc1                 | mov                 dword ptr [ebp - 0x1c], 1
            //   59                   | xor                 ebx, ebx
            //   e9????????           |                     
            //   e8????????           |                     
            //   ff742404             | cmp                 dword ptr [esi + 8], ebx

        $sequence_4 = { 488d9424001b0000 458bc8 66666690 0fb602 458bc4 3c41 }
            // n = 6, score = 200
            //   488d9424001b0000     | inc                 ebp
            //   458bc8               | mov                 ecx, eax
            //   66666690             | nop                 
            //   0fb602               | nop                 
            //   458bc4               | dec                 eax
            //   3c41                 | lea                 edx, [esp + 0x1b00]

        $sequence_5 = { 0401 3cbe 8844240b 76e2 }
            // n = 4, score = 200
            //   0401                 | add                 ecx, esi
            //   3cbe                 | mov                 byte ptr [esp + ecx + 0x138], 0
            //   8844240b             | lea                 eax, [esp + 0x5ca0]
            //   76e2                 | xor                 esi, esi

        $sequence_6 = { 488905???????? e8???????? 4c8d1d5cd40100 498bcc }
            // n = 4, score = 200
            //   488905????????       |                     
            //   e8????????           |                     
            //   4c8d1d5cd40100       | nop                 
            //   498bcc               | movzx               eax, byte ptr [ecx]

        $sequence_7 = { 03ce c6840c3801000000 8d8424a05c0000 33f6 }
            // n = 4, score = 200
            //   03ce                 | jne                 0x38
            //   c6840c3801000000     | add                 esi, dword ptr [eax*4 + 0x42e5c0]
            //   8d8424a05c0000       | mov                 dword ptr [ebp - 0x1c], 1
            //   33f6                 | xor                 ebx, ebx

        $sequence_8 = { 00686c 42 0023 d18a0688078a }
            // n = 4, score = 200
            //   00686c               | lea                 edx, [esp + 0x3040]
            //   42                   | inc                 ebp
            //   0023                 | mov                 ecx, eax
            //   d18a0688078a         | nop                 

        $sequence_9 = { 4488a424401f0000 488905???????? e8???????? 4c8d1da5120200 }
            // n = 4, score = 200
            //   4488a424401f0000     | inc                 ebp
            //   488905????????       |                     
            //   e8????????           |                     
            //   4c8d1da5120200       | mov                 ecx, eax

        $sequence_10 = { 030495c0e54200 eb05 b8???????? f6400420 }
            // n = 4, score = 200
            //   030495c0e54200       | dec                 esp
            //   eb05                 | lea                 eax, [esp + 0x70]
            //   b8????????           |                     
            //   f6400420             | inc                 ecx

        $sequence_11 = { 033485c0e54200 8b45e4 8b00 8906 }
            // n = 4, score = 200
            //   033485c0e54200       | push                2
            //   8b45e4               | add                 eax, dword ptr [edx*4 + 0x42e5c0]
            //   8b00                 | jmp                 7
            //   8906                 | test                byte ptr [eax + 4], 0x20

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

        $sequence_13 = { 88840c400e0000 75ed 488d8c24400e0000 4d8bc4 6690 }
            // n = 5, score = 200
            //   88840c400e0000       | mov                 byte ptr [esp + ecx + 0xe40], al
            //   75ed                 | jne                 0xffffffef
            //   488d8c24400e0000     | dec                 eax
            //   4d8bc4               | lea                 ecx, [esp + 0xe40]
            //   6690                 | dec                 ebp

        $sequence_14 = { 0f84b6010000 488d9424e0070000 458bc8 66666690 66666690 }
            // n = 5, score = 200
            //   0f84b6010000         | mov                 eax, esp
            //   488d9424e0070000     | nop                 
            //   458bc8               | je                  0x1bc
            //   66666690             | dec                 eax
            //   66666690             | lea                 edx, [esp + 0x7e0]

        $sequence_15 = { 488d942480560000 488bcf ff15???????? 85c0 8903 }
            // n = 5, score = 200
            //   488d942480560000     | mov                 byte ptr [esp + 0x1f40], ah
            //   488bcf               | dec                 esp
            //   ff15????????         |                     
            //   85c0                 | lea                 ebx, [0x212a5]
            //   8903                 | mov                 byte ptr [esp + ecx + 0x5240], al

    condition:
        7 of them and filesize < 434176
}