rule win_mespinoza_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        version = "1"
        description = "Detects win.mespinoza."
        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.mespinoza"
        malpedia_rule_date = "20230705"
        malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41"
        malpedia_version = "20230715"
        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 = { 8b4500 2bf8 8b33 57 50 56 }
            // n = 6, score = 200
            //   8b4500               | mov                 eax, dword ptr [ebp]
            //   2bf8                 | sub                 edi, eax
            //   8b33                 | mov                 esi, dword ptr [ebx]
            //   57                   | push                edi
            //   50                   | push                eax
            //   56                   | push                esi

        $sequence_1 = { 8b5010 8bc2 8bca 83e03f c1f906 6bc030 8b0c8d00b04700 }
            // n = 7, score = 200
            //   8b5010               | mov                 edx, dword ptr [eax + 0x10]
            //   8bc2                 | mov                 eax, edx
            //   8bca                 | mov                 ecx, edx
            //   83e03f               | and                 eax, 0x3f
            //   c1f906               | sar                 ecx, 6
            //   6bc030               | imul                eax, eax, 0x30
            //   8b0c8d00b04700       | mov                 ecx, dword ptr [ecx*4 + 0x47b000]

        $sequence_2 = { 8d41ff 83c1ff 8945d0 894d0c 0f880a010000 51 8b4d10 }
            // n = 7, score = 200
            //   8d41ff               | lea                 eax, [ecx - 1]
            //   83c1ff               | add                 ecx, -1
            //   8945d0               | mov                 dword ptr [ebp - 0x30], eax
            //   894d0c               | mov                 dword ptr [ebp + 0xc], ecx
            //   0f880a010000         | js                  0x110
            //   51                   | push                ecx
            //   8b4d10               | mov                 ecx, dword ptr [ebp + 0x10]

        $sequence_3 = { 2b45e4 6a18 59 99 f7f9 8365fc00 33c9 }
            // n = 7, score = 200
            //   2b45e4               | sub                 eax, dword ptr [ebp - 0x1c]
            //   6a18                 | push                0x18
            //   59                   | pop                 ecx
            //   99                   | cdq                 
            //   f7f9                 | idiv                ecx
            //   8365fc00             | and                 dword ptr [ebp - 4], 0
            //   33c9                 | xor                 ecx, ecx

        $sequence_4 = { ff501c 8bcb 8945e8 2bc8 894de0 8d0c4501000000 3bd9 }
            // n = 7, score = 200
            //   ff501c               | call                dword ptr [eax + 0x1c]
            //   8bcb                 | mov                 ecx, ebx
            //   8945e8               | mov                 dword ptr [ebp - 0x18], eax
            //   2bc8                 | sub                 ecx, eax
            //   894de0               | mov                 dword ptr [ebp - 0x20], ecx
            //   8d0c4501000000       | lea                 ecx, [eax*2 + 1]
            //   3bd9                 | cmp                 ebx, ecx

        $sequence_5 = { 8b4c2408 85c9 7428 8b442404 0f1f4000 }
            // n = 5, score = 200
            //   8b4c2408             | mov                 ecx, dword ptr [esp + 8]
            //   85c9                 | test                ecx, ecx
            //   7428                 | je                  0x2a
            //   8b442404             | mov                 eax, dword ptr [esp + 4]
            //   0f1f4000             | nop                 dword ptr [eax]

        $sequence_6 = { 8d45f4 64a300000000 8bd1 8b4204 3b4208 8b720c 8bfe }
            // n = 7, score = 200
            //   8d45f4               | lea                 eax, [ebp - 0xc]
            //   64a300000000         | mov                 dword ptr fs:[0], eax
            //   8bd1                 | mov                 edx, ecx
            //   8b4204               | mov                 eax, dword ptr [edx + 4]
            //   3b4208               | cmp                 eax, dword ptr [edx + 8]
            //   8b720c               | mov                 esi, dword ptr [edx + 0xc]
            //   8bfe                 | mov                 edi, esi

        $sequence_7 = { 51 e8???????? 83c40c 8b4508 c74704ffffff3f 56 }
            // n = 6, score = 200
            //   51                   | push                ecx
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   c74704ffffff3f       | mov                 dword ptr [edi + 4], 0x3fffffff
            //   56                   | push                esi

        $sequence_8 = { 7430 46 83fe08 72ca f685acedffff10 8d85fcf7ffff 744d }
            // n = 7, score = 200
            //   7430                 | je                  0x32
            //   46                   | inc                 esi
            //   83fe08               | cmp                 esi, 8
            //   72ca                 | jb                  0xffffffcc
            //   f685acedffff10       | test                byte ptr [ebp - 0x1254], 0x10
            //   8d85fcf7ffff         | lea                 eax, [ebp - 0x804]
            //   744d                 | je                  0x4f

        $sequence_9 = { e8???????? 83a600b0470000 59 83c604 81fe00020000 }
            // n = 5, score = 200
            //   e8????????           |                     
            //   83a600b0470000       | and                 dword ptr [esi + 0x47b000], 0
            //   59                   | pop                 ecx
            //   83c604               | add                 esi, 4
            //   81fe00020000         | cmp                 esi, 0x200

    condition:
        7 of them and filesize < 1091584
}