rule win_unidentified_037_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.unidentified_037."
        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.unidentified_037"
        malpedia_rule_date = "20260422"
        malpedia_hash = "a182e35da64e6d71cb55f125c4d4225196523f14"
        malpedia_version = "20260504"
        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 = { 8b45f4 8b7c2420 2bc2 8b5104 03c2 894108 }
            // n = 6, score = 100
            //   8b45f4               | mov                 eax, dword ptr [ebp - 0xc]
            //   8b7c2420             | mov                 edi, dword ptr [esp + 0x20]
            //   2bc2                 | sub                 eax, edx
            //   8b5104               | mov                 edx, dword ptr [ecx + 4]
            //   03c2                 | add                 eax, edx
            //   894108               | mov                 dword ptr [ecx + 8], eax

        $sequence_1 = { 8d54ad00 8bc3 c1e205 03d5 895c2424 c1e202 2bc2 }
            // n = 7, score = 100
            //   8d54ad00             | lea                 edx, [ebp + ebp*4]
            //   8bc3                 | mov                 eax, ebx
            //   c1e205               | shl                 edx, 5
            //   03d5                 | add                 edx, ebp
            //   895c2424             | mov                 dword ptr [esp + 0x24], ebx
            //   c1e202               | shl                 edx, 2
            //   2bc2                 | sub                 eax, edx

        $sequence_2 = { 0f849c020000 8d442410 57 8b3d???????? 50 66c7060000 ffd7 }
            // n = 7, score = 100
            //   0f849c020000         | je                  0x2a2
            //   8d442410             | lea                 eax, [esp + 0x10]
            //   57                   | push                edi
            //   8b3d????????         |                     
            //   50                   | push                eax
            //   66c7060000           | mov                 word ptr [esi], 0
            //   ffd7                 | call                edi

        $sequence_3 = { 8b7108 8b6c2428 8bd6 2bd3 c1fa04 2bfa 7415 }
            // n = 7, score = 100
            //   8b7108               | mov                 esi, dword ptr [ecx + 8]
            //   8b6c2428             | mov                 ebp, dword ptr [esp + 0x28]
            //   8bd6                 | mov                 edx, esi
            //   2bd3                 | sub                 edx, ebx
            //   c1fa04               | sar                 edx, 4
            //   2bfa                 | sub                 edi, edx
            //   7415                 | je                  0x17

        $sequence_4 = { 68???????? eb22 8a8424ac000000 a880 7407 68???????? eb10 }
            // n = 7, score = 100
            //   68????????           |                     
            //   eb22                 | jmp                 0x24
            //   8a8424ac000000       | mov                 al, byte ptr [esp + 0xac]
            //   a880                 | test                al, 0x80
            //   7407                 | je                  9
            //   68????????           |                     
            //   eb10                 | jmp                 0x12

        $sequence_5 = { 895e58 895e5c 895e60 8b4648 3bc3 741d 8d48ff }
            // n = 7, score = 100
            //   895e58               | mov                 dword ptr [esi + 0x58], ebx
            //   895e5c               | mov                 dword ptr [esi + 0x5c], ebx
            //   895e60               | mov                 dword ptr [esi + 0x60], ebx
            //   8b4648               | mov                 eax, dword ptr [esi + 0x48]
            //   3bc3                 | cmp                 eax, ebx
            //   741d                 | je                  0x1f
            //   8d48ff               | lea                 ecx, [eax - 1]

        $sequence_6 = { 6a00 ff15???????? 50 ff15???????? 83c408 33ff e8???????? }
            // n = 7, score = 100
            //   6a00                 | push                0
            //   ff15????????         |                     
            //   50                   | push                eax
            //   ff15????????         |                     
            //   83c408               | add                 esp, 8
            //   33ff                 | xor                 edi, edi
            //   e8????????           |                     

        $sequence_7 = { 50 8b442428 51 8b4c243c }
            // n = 4, score = 100
            //   50                   | push                eax
            //   8b442428             | mov                 eax, dword ptr [esp + 0x28]
            //   51                   | push                ecx
            //   8b4c243c             | mov                 ecx, dword ptr [esp + 0x3c]

        $sequence_8 = { 83c008 50 8d85a0ebffff 50 e8???????? }
            // n = 5, score = 100
            //   83c008               | add                 eax, 8
            //   50                   | push                eax
            //   8d85a0ebffff         | lea                 eax, [ebp - 0x1460]
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_9 = { 84d2 7414 3ad3 7410 55 51 8d4c2418 }
            // n = 7, score = 100
            //   84d2                 | test                dl, dl
            //   7414                 | je                  0x16
            //   3ad3                 | cmp                 dl, bl
            //   7410                 | je                  0x12
            //   55                   | push                ebp
            //   51                   | push                ecx
            //   8d4c2418             | lea                 ecx, [esp + 0x18]

    condition:
        7 of them and filesize < 167936
}