rule win_mechanical_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-12-22"
        version = "1"
        description = "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 = "20201222"
        malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130"
        malpedia_version = "20201023"
        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 = { 4c8d9c2490020000 488d8c24a5020000 33d2 498903 }
            // n = 4, score = 200
            //   4c8d9c2490020000     | jne                 0xfffffff2
            //   488d8c24a5020000     | inc                 ecx
            //   33d2                 | mov                 byte ptr [ebx], 0
            //   498903               | dec                 esp

        $sequence_1 = { 84c0 0f8409000000 4983c101 4d85db 75e7 488d942480010000 41ba0b000000 }
            // n = 7, score = 200
            //   84c0                 | bts                 edi, 0x12
            //   0f8409000000         | jmp                 0x46
            //   4983c101             | dec                 eax
            //   4d85db               | lea                 edx, [0xd2d9]
            //   75e7                 | dec                 eax
            //   488d942480010000     | add                 edx, 1
            //   41ba0b000000         | dec                 ecx

        $sequence_2 = { 0f86df020000 8d9b00000000 8a8414243d0000 33c9 3c41 7212 }
            // n = 6, score = 200
            //   0f86df020000         | test                al, al
            //   8d9b00000000         | je                  0x11
            //   8a8414243d0000       | dec                 ecx
            //   33c9                 | add                 ecx, 1
            //   3c41                 | dec                 ebp
            //   7212                 | test                ebx, ebx

        $sequence_3 = { c68414243d00003f eb12 c68414243d00002e eb08 c68414243d00002c 3bcd 7408 }
            // n = 7, score = 200
            //   c68414243d00003f     | inc                 ecx
            //   eb12                 | mov                 edx, 0xb
            //   c68414243d00002e     | dec                 ecx
            //   eb08                 | add                 eax, 1
            //   c68414243d00002c     | dec                 eax
            //   3bcd                 | test                ecx, ecx
            //   7408                 | jne                 0xffffffed

        $sequence_4 = { e8???????? 85c0 750a 4883c30a 0fbaef12 eb3c 488d15d9d20000 }
            // n = 7, score = 200
            //   e8????????           |                     
            //   85c0                 | dec                 esp
            //   750a                 | lea                 ebx, [0x1f635]
            //   4883c30a             | dec                 ecx
            //   0fbaef12             | mov                 ecx, esp
            //   eb3c                 | inc                 ecx
            //   488d15d9d20000       | mov                 eax, 6

        $sequence_5 = { 0f8766010000 4898 0fb68428a4110100 8b8c85d0100100 }
            // n = 4, score = 200
            //   0f8766010000         | test                eax, eax
            //   4898                 | jne                 0xe
            //   0fb68428a4110100     | dec                 eax
            //   8b8c85d0100100       | add                 ebx, 0xa

        $sequence_6 = { 41b806000000 4c8d0d38f40000 4c3948f0 740c }
            // n = 4, score = 200
            //   41b806000000         | lea                 ecx, [esp + 0x2a5]
            //   4c8d0d38f40000       | xor                 edx, edx
            //   4c3948f0             | dec                 ecx
            //   740c                 | mov                 dword ptr [ebx], eax

        $sequence_7 = { e9???????? c68414400300003b e9???????? c68414400300002b e9???????? c68414400300003e }
            // n = 6, score = 200
            //   e9????????           |                     
            //   c68414400300003b     | jbe                 0x2e5
            //   e9????????           |                     
            //   c68414400300002b     | lea                 ebx, [ebx]
            //   e9????????           |                     
            //   c68414400300003e     | mov                 al, byte ptr [esp + edx + 0x3d24]

        $sequence_8 = { c68414584a000075 e9???????? c68414584a00006e e9???????? c68414584a00002d }
            // n = 5, score = 200
            //   c68414584a000075     | dec                 eax
            //   e9????????           |                     
            //   c68414584a00006e     | lea                 edx, [esp + 0x1f40]
            //   e9????????           |                     
            //   c68414584a00002d     | jmp                 0x28

        $sequence_9 = { 488905???????? e8???????? 4c8d1d35f60100 498bcc }
            // n = 4, score = 200
            //   488905????????       |                     
            //   e8????????           |                     
            //   4c8d1d35f60100       | lea                 ebx, [esp + 0x290]
            //   498bcc               | dec                 eax

        $sequence_10 = { c68414741000006c e9???????? c684147410000064 e9???????? c684147410000070 e9???????? }
            // n = 6, score = 200
            //   c68414741000006c     | inc                 ebp
            //   e9????????           |                     
            //   c684147410000064     | test                eax, eax
            //   e9????????           |                     
            //   c684147410000070     | je                  0x1de
            //   e9????????           |                     

        $sequence_11 = { c684143c43000025 e9???????? c684143c4300002a e9???????? c684143c43000026 }
            // n = 5, score = 200
            //   c684143c43000025     | jne                 0xfffffff0
            //   e9????????           |                     
            //   c684143c4300002a     | dec                 eax
            //   e9????????           |                     
            //   c684143c43000026     | lea                 edx, [esp + 0x180]

        $sequence_12 = { eb26 c684141c3b00002f eb1c c684141c3b00003f eb12 }
            // n = 5, score = 200
            //   eb26                 | ja                  0x16c
            //   c684141c3b00002f     | dec                 eax
            //   eb1c                 | cwde                
            //   c684141c3b00003f     | movzx               eax, byte ptr [eax + ebp + 0x111a4]
            //   eb12                 | mov                 ecx, dword ptr [ebp + eax*4 + 0x110d0]

        $sequence_13 = { 4883e901 4188440bde 75f0 41c60300 }
            // n = 4, score = 200
            //   4883e901             | dec                 eax
            //   4188440bde           | sub                 ecx, 1
            //   75f0                 | inc                 ecx
            //   41c60300             | mov                 byte ptr [ebx + ecx - 0x22], al

        $sequence_14 = { 4883c201 4983e901 0f853ffeffff 488d942490130000 488bcf ff15???????? }
            // n = 6, score = 200
            //   4883c201             | dec                 esp
            //   4983e901             | lea                 ecx, [0xf438]
            //   0f853ffeffff         | dec                 esp
            //   488d942490130000     | cmp                 dword ptr [eax - 0x10], ecx
            //   488bcf               | je                  0x12
            //   ff15????????         |                     

        $sequence_15 = { c68414203c00003a e9???????? c68414203c000023 e9???????? c68414203c000021 e9???????? c68414203c000025 }
            // n = 7, score = 200
            //   c68414203c00003a     | mov                 byte ptr [esp + edx + 0x3b1c], 0x2f
            //   e9????????           |                     
            //   c68414203c000023     | jmp                 0x26
            //   e9????????           |                     
            //   c68414203c000021     | mov                 byte ptr [esp + edx + 0x3b1c], 0x3f
            //   e9????????           |                     
            //   c68414203c000025     | jmp                 0x26

    condition:
        7 of them and filesize < 434176
}