rule win_mechanical_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-10-14"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.5.0"
        tool_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.mechanical"
        malpedia_rule_date = "20201014"
        malpedia_hash = "a7e3bd57eaf12bf3ea29a863c041091ba3af9ac9"
        malpedia_version = "20201014"
        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 = { 448928 4c896c2420 4533c9 4533c0 33d2 33c9 }
            // n = 6, score = 200
            //   448928               | inc                 esp
            //   4c896c2420           | mov                 dword ptr [eax], ebp
            //   4533c9               | dec                 esp
            //   4533c0               | mov                 dword ptr [esp + 0x20], ebp
            //   33d2                 | inc                 ebp
            //   33c9                 | xor                 ecx, ecx

        $sequence_1 = { 75ed 488d8c2470330000 4d8bc4 6690 0fb601 4883c101 84c0 }
            // n = 7, score = 200
            //   75ed                 | inc                 ebp
            //   488d8c2470330000     | xor                 eax, eax
            //   4d8bc4               | xor                 edx, edx
            //   6690                 | xor                 ecx, ecx
            //   0fb601               | jne                 0xffffffef
            //   4883c101             | dec                 eax
            //   84c0                 | lea                 ecx, [esp + 0x3370]

        $sequence_2 = { 7e17 430fb60c10 e8???????? 85c0 7413 4983c001 }
            // n = 6, score = 200
            //   7e17                 | lea                 edx, [0xf729]
            //   430fb60c10           | mov                 dword ptr [ebx + 4], ebp
            //   e8????????           |                     
            //   85c0                 | mov                 dword ptr [ebx + 8], ebp
            //   7413                 | mov                 dword ptr [ebx + 0xc], ebp
            //   4983c001             | dec                 eax

        $sequence_3 = { 3bc3 0f47cb 482bf9 4c03f1 3bc3 }
            // n = 5, score = 200
            //   3bc3                 | dec                 ebp
            //   0f47cb               | mov                 eax, esp
            //   482bf9               | nop                 
            //   4c03f1               | movzx               eax, byte ptr [ecx]
            //   3bc3                 | dec                 eax

        $sequence_4 = { 488d8c24c15a0000 33d2 41b803010000 4489642430 4488a424c05a0000 e8???????? 4c8d1d6e510200 }
            // n = 7, score = 200
            //   488d8c24c15a0000     | sub                 edi, ecx
            //   33d2                 | dec                 esp
            //   41b803010000         | add                 esi, ecx
            //   4489642430           | cmp                 eax, ebx
            //   4488a424c05a0000     | xor                 ebp, ebp
            //   e8????????           |                     
            //   4c8d1d6e510200       | dec                 eax

        $sequence_5 = { 740e e8???????? eb07 4c8d258cf20000 4889beb8000000 f0830701 }
            // n = 6, score = 200
            //   740e                 | inc                 esp
            //   e8????????           |                     
            //   eb07                 | mov                 byte ptr [esp + 0x5ac0], ah
            //   4c8d258cf20000       | dec                 esp
            //   4889beb8000000       | lea                 ebx, [0x2516e]
            //   f0830701             | jle                 0x19

        $sequence_6 = { 41b800010000 8b4104 8b5114 498bcc }
            // n = 4, score = 200
            //   41b800010000         | inc                 ebx
            //   8b4104               | movzx               ecx, byte ptr [eax + edx]
            //   8b5114               | test                eax, eax
            //   498bcc               | je                  0x17

        $sequence_7 = { 33ed 488d1529f70000 896b04 896b08 896b0c }
            // n = 5, score = 200
            //   33ed                 | add                 ecx, 1
            //   488d1529f70000       | test                al, al
            //   896b04               | cmp                 eax, ebx
            //   896b08               | cmova               ecx, ebx
            //   896b0c               | dec                 eax

        $sequence_8 = { e9???????? c68414c424000066 e9???????? c68414c424000068 e9???????? c68414c424000078 e9???????? }
            // n = 7, score = 100
            //   e9????????           |                     
            //   c68414c424000066     | dec                 eax
            //   e9????????           |                     
            //   c68414c424000068     | mov                 dword ptr [esi + 0xb8], edi
            //   e9????????           |                     
            //   c68414c424000078     | lock add            dword ptr [edi], 1
            //   e9????????           |                     

        $sequence_9 = { c684144c06000075 e9???????? c684144c0600006e e9???????? c684144c0600002d e9???????? }
            // n = 6, score = 100
            //   c684144c06000075     | dec                 eax
            //   e9????????           |                     
            //   c684144c0600006e     | lea                 ecx, [esp + 0x59b0]
            //   e9????????           |                     
            //   c684144c0600002d     | dec                 ebp
            //   e9????????           |                     

        $sequence_10 = { 0420 b901000000 88841470500000 0fb6841470500000 }
            // n = 4, score = 100
            //   0420                 | mov                 dword ptr [esp + 0x30], ebx
            //   b901000000           | dec                 eax
            //   88841470500000       | mov                 dword ptr [esp + 0x38], ebp
            //   0fb6841470500000     | dec                 eax

        $sequence_11 = { e9???????? c68414881500002a e9???????? c684148815000026 e9???????? c68414881500005b }
            // n = 6, score = 100
            //   e9????????           |                     
            //   c68414881500002a     | mov                 eax, dword ptr [ecx + 4]
            //   e9????????           |                     
            //   c684148815000026     | mov                 edx, dword ptr [ecx + 0x14]
            //   e9????????           |                     
            //   c68414881500005b     | dec                 ecx

        $sequence_12 = { 0fb680a08a4100 ff2485cc894100 c68414d82900006d e9???????? c68414d829000071 }
            // n = 5, score = 100
            //   0fb680a08a4100       | mov                 ecx, esp
            //   ff2485cc894100       | dec                 eax
            //   c68414d82900006d     | sub                 esp, 0x28
            //   e9????????           |                     
            //   c68414d829000071     | dec                 eax

        $sequence_13 = { c68414845500003b e9???????? c68414845500002b e9???????? }
            // n = 4, score = 100
            //   c68414845500003b     | inc                 ecx
            //   e9????????           |                     
            //   c68414845500002b     | mov                 eax, 0x100
            //   e9????????           |                     

        $sequence_14 = { 8d8c243a010000 8db4242c060000 bf05000000 8d9b00000000 b822000000 8a5406ff }
            // n = 6, score = 100
            //   8d8c243a010000       | mov                 eax, esp
            //   8db4242c060000       | nop                 
            //   bf05000000           | je                  0x10
            //   8d9b00000000         | jmp                 0xb
            //   b822000000           | dec                 esp
            //   8a5406ff             | lea                 esp, [0xf28c]

        $sequence_15 = { 83e11f 6bc928 8b0485c0e54200 c644080401 57 e8???????? 59 }
            // n = 7, score = 100
            //   83e11f               | mov                 ebp, edx
            //   6bc928               | dec                 ecx
            //   8b0485c0e54200       | arpl                ax, bx
            //   c644080401           | test                eax, eax
            //   57                   | mov                 byte ptr [esp + edx + 0x64c], 0x75
            //   e8????????           |                     
            //   59                   | mov                 byte ptr [esp + edx + 0x64c], 0x6e

    condition:
        7 of them and filesize < 434176
}