rule win_emdivi_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.emdivi"
        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 = { 8945e8 8d44b9fc 8b18 4f 8945ec 895df4 }
            // n = 6, score = 300
            //   8945e8               | mov                 dword ptr [ebp - 0x18], eax
            //   8d44b9fc             | lea                 eax, [ecx + edi*4 - 4]
            //   8b18                 | mov                 ebx, dword ptr [eax]
            //   4f                   | dec                 edi
            //   8945ec               | mov                 dword ptr [ebp - 0x14], eax
            //   895df4               | mov                 dword ptr [ebp - 0xc], ebx

        $sequence_1 = { 6a64 99 59 f7f9 85d2 750e 8bc7 }
            // n = 7, score = 300
            //   6a64                 | push                0x64
            //   99                   | cdq                 
            //   59                   | pop                 ecx
            //   f7f9                 | idiv                ecx
            //   85d2                 | test                edx, edx
            //   750e                 | jne                 0x10
            //   8bc7                 | mov                 eax, edi

        $sequence_2 = { 7404 8bf3 eb17 f6c307 740f 8d73ff }
            // n = 6, score = 300
            //   7404                 | je                  6
            //   8bf3                 | mov                 esi, ebx
            //   eb17                 | jmp                 0x19
            //   f6c307               | test                bl, 7
            //   740f                 | je                  0x11
            //   8d73ff               | lea                 esi, [ebx - 1]

        $sequence_3 = { 3975fc 74cb 56 56 53 }
            // n = 5, score = 300
            //   3975fc               | cmp                 dword ptr [ebp - 4], esi
            //   74cb                 | je                  0xffffffcd
            //   56                   | push                esi
            //   56                   | push                esi
            //   53                   | push                ebx

        $sequence_4 = { 83ffff 0f8db5000000 6a34 f7df }
            // n = 4, score = 300
            //   83ffff               | cmp                 edi, -1
            //   0f8db5000000         | jge                 0xbb
            //   6a34                 | push                0x34
            //   f7df                 | neg                 edi

        $sequence_5 = { 8945f4 8b45e0 83c40c 40 8945f8 8b45dc 8945fc }
            // n = 7, score = 300
            //   8945f4               | mov                 dword ptr [ebp - 0xc], eax
            //   8b45e0               | mov                 eax, dword ptr [ebp - 0x20]
            //   83c40c               | add                 esp, 0xc
            //   40                   | inc                 eax
            //   8945f8               | mov                 dword ptr [ebp - 8], eax
            //   8b45dc               | mov                 eax, dword ptr [ebp - 0x24]
            //   8945fc               | mov                 dword ptr [ebp - 4], eax

        $sequence_6 = { 03ca 51 8d443001 50 e8???????? }
            // n = 5, score = 300
            //   03ca                 | add                 ecx, edx
            //   51                   | push                ecx
            //   8d443001             | lea                 eax, [eax + esi + 1]
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_7 = { 0bc6 33c2 0345dc 89594c 8d843891d386eb c1c80b 034150 }
            // n = 7, score = 300
            //   0bc6                 | or                  eax, esi
            //   33c2                 | xor                 eax, edx
            //   0345dc               | add                 eax, dword ptr [ebp - 0x24]
            //   89594c               | mov                 dword ptr [ecx + 0x4c], ebx
            //   8d843891d386eb       | lea                 eax, [eax + edi - 0x14792c6f]
            //   c1c80b               | ror                 eax, 0xb
            //   034150               | add                 eax, dword ptr [ecx + 0x50]

        $sequence_8 = { eb03 8975fc 3975fc 74cb 56 56 }
            // n = 6, score = 300
            //   eb03                 | jmp                 5
            //   8975fc               | mov                 dword ptr [ebp - 4], esi
            //   3975fc               | cmp                 dword ptr [ebp - 4], esi
            //   74cb                 | je                  0xffffffcd
            //   56                   | push                esi
            //   56                   | push                esi

        $sequence_9 = { 51 e8???????? ff75b8 e8???????? }
            // n = 4, score = 300
            //   51                   | push                ecx
            //   e8????????           |                     
            //   ff75b8               | push                dword ptr [ebp - 0x48]
            //   e8????????           |                     

    condition:
        7 of them and filesize < 581632
}