rule win_mechanical_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-08-05"
        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 = "20220805"
        malpedia_hash = "6ec06c64bcfdbeda64eff021c766b4ce34542b71"
        malpedia_version = "20220808"
        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 = { 488bce 488d540464 666690 0fb6840c7f010000 }
            // n = 4, score = 200
            //   488bce               | xor                 edx, edx
            //   488d540464           | inc                 ecx
            //   666690               | mov                 eax, 0x103
            //   0fb6840c7f010000     | inc                 esp

        $sequence_2 = { 488d542420 b904010000 ff15???????? 488d4c2420 }
            // n = 4, score = 200
            //   488d542420           | dec                 eax
            //   b904010000           | lea                 edx, [esp + 0x20]
            //   ff15????????         |                     
            //   488d4c2420           | mov                 ecx, 0x104

        $sequence_3 = { 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_4 = { 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_5 = { 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_6 = { 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_7 = { 8903 0f840c910000 8b442430 488d8c2481450000 33d2 41b803010000 4488a42480450000 }
            // n = 7, score = 200
            //   8903                 | dec                 eax
            //   0f840c910000         | lea                 edx, [esp + 0x6d0]
            //   8b442430             | dec                 eax
            //   488d8c2481450000     | mov                 ecx, edi
            //   33d2                 | test                eax, eax
            //   41b803010000         | inc                 ecx
            //   4488a42480450000     | mov                 eax, 0x103

        $sequence_8 = { 41b803010000 4488a424f03b0000 488905???????? e8???????? 4c8d1da59a0100 }
            // n = 5, score = 200
            //   41b803010000         | add                 edx, 1
            //   4488a424f03b0000     | test                al, al
            //   488905????????       |                     
            //   e8????????           |                     
            //   4c8d1da59a0100       | je                  0xb

        $sequence_9 = { 4c8d1d2b400200 498bcc 498bd3 0fb602 4883c201 84c0 7409 }
            // n = 7, score = 200
            //   4c8d1d2b400200       | dec                 eax
            //   498bcc               | lea                 ecx, [esp + 0x20]
            //   498bd3               | dec                 esp
            //   0fb602               | lea                 ebx, [0x2402b]
            //   4883c201             | dec                 ecx
            //   84c0                 | mov                 ecx, esp
            //   7409                 | dec                 ecx

        $sequence_10 = { 6690 410fb6440bff 4883e901 88840cb0260000 75ed 488d8c24b0260000 4d8bc4 }
            // n = 7, score = 200
            //   6690                 | mov                 byte ptr [esp + 0x4580], ah
            //   410fb6440bff         | inc                 ebp
            //   4883e901             | test                eax, eax
            //   88840cb0260000       | je                  0x1d6
            //   75ed                 | dec                 eax
            //   488d8c24b0260000     | lea                 edx, [esp + 0x5bd0]
            //   4d8bc4               | inc                 ebp

        $sequence_11 = { 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_12 = { 488d9424d0060000 488bcf ff15???????? 85c0 }
            // n = 4, score = 200
            //   488d9424d0060000     | mov                 edx, ebx
            //   488bcf               | movzx               eax, byte ptr [edx]
            //   ff15????????         |                     
            //   85c0                 | dec                 eax

        $sequence_13 = { 4585c0 0f84d0010000 488d9424d05b0000 458bc8 66666690 }
            // n = 5, score = 200
            //   4585c0               | inc                 esp
            //   0f84d0010000         | mov                 byte ptr [esp + 0x3bf0], ah
            //   488d9424d05b0000     | dec                 esp
            //   458bc8               | lea                 ebx, [0x19aa5]
            //   66666690             | mov                 dword ptr [ebx], eax

        $sequence_14 = { 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_15 = { 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

    condition:
        7 of them and filesize < 434176
}