rule win_unidentified_037_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        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 = "20260916"
        malpedia_hash = "53a643781c18e08f4a50949af60172d837a0b6f6"
        malpedia_version = "20260917"
        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 = { 33ed 3bf5 7639 8b542418 55 8d4c2414 8d3c32 }
            // n = 7, score = 100
            //   33ed                 | xor                 ebp, ebp
            //   3bf5                 | cmp                 esi, ebp
            //   7639                 | jbe                 0x3b
            //   8b542418             | mov                 edx, dword ptr [esp + 0x18]
            //   55                   | push                ebp
            //   8d4c2414             | lea                 ecx, [esp + 0x14]
            //   8d3c32               | lea                 edi, [edx + esi]

        $sequence_1 = { 80e307 2407 84c9 885c2424 885a0b 88442428 88420a }
            // n = 7, score = 100
            //   80e307               | and                 bl, 7
            //   2407                 | and                 al, 7
            //   84c9                 | test                cl, cl
            //   885c2424             | mov                 byte ptr [esp + 0x24], bl
            //   885a0b               | mov                 byte ptr [edx + 0xb], bl
            //   88442428             | mov                 byte ptr [esp + 0x28], al
            //   88420a               | mov                 byte ptr [edx + 0xa], al

        $sequence_2 = { 50 ff15???????? a1???????? 8b0d???????? 50 51 e8???????? }
            // n = 7, score = 100
            //   50                   | push                eax
            //   ff15????????         |                     
            //   a1????????           |                     
            //   8b0d????????         |                     
            //   50                   | push                eax
            //   51                   | push                ecx
            //   e8????????           |                     

        $sequence_3 = { 7410 8b7218 83ce04 43 897218 8a43ff 884210 }
            // n = 7, score = 100
            //   7410                 | je                  0x12
            //   8b7218               | mov                 esi, dword ptr [edx + 0x18]
            //   83ce04               | or                  esi, 4
            //   43                   | inc                 ebx
            //   897218               | mov                 dword ptr [edx + 0x18], esi
            //   8a43ff               | mov                 al, byte ptr [ebx - 1]
            //   884210               | mov                 byte ptr [edx + 0x10], al

        $sequence_4 = { 53 8d4c2434 50 51 6a01 56 c744244000040000 }
            // n = 7, score = 100
            //   53                   | push                ebx
            //   8d4c2434             | lea                 ecx, [esp + 0x34]
            //   50                   | push                eax
            //   51                   | push                ecx
            //   6a01                 | push                1
            //   56                   | push                esi
            //   c744244000040000     | mov                 dword ptr [esp + 0x40], 0x400

        $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 = { 52 e8???????? 50 8d4c244c c68424c408000007 e8???????? 8d8c2498040000 }
            // n = 7, score = 100
            //   52                   | push                edx
            //   e8????????           |                     
            //   50                   | push                eax
            //   8d4c244c             | lea                 ecx, [esp + 0x4c]
            //   c68424c408000007     | mov                 byte ptr [esp + 0x8c4], 7
            //   e8????????           |                     
            //   8d8c2498040000       | lea                 ecx, [esp + 0x498]

        $sequence_7 = { 8b74240c 8d442404 57 8b3d???????? 50 6a40 6a0c }
            // n = 7, score = 100
            //   8b74240c             | mov                 esi, dword ptr [esp + 0xc]
            //   8d442404             | lea                 eax, [esp + 4]
            //   57                   | push                edi
            //   8b3d????????         |                     
            //   50                   | push                eax
            //   6a40                 | push                0x40
            //   6a0c                 | push                0xc

        $sequence_8 = { 7424 a808 0f849e000000 8b4a18 81c908010000 83c302 }
            // n = 6, score = 100
            //   7424                 | je                  0x26
            //   a808                 | test                al, 8
            //   0f849e000000         | je                  0xa4
            //   8b4a18               | mov                 ecx, dword ptr [edx + 0x18]
            //   81c908010000         | or                  ecx, 0x108
            //   83c302               | add                 ebx, 2

        $sequence_9 = { 7417 8b4c2420 56 57 51 e8???????? 56 }
            // n = 7, score = 100
            //   7417                 | je                  0x19
            //   8b4c2420             | mov                 ecx, dword ptr [esp + 0x20]
            //   56                   | push                esi
            //   57                   | push                edi
            //   51                   | push                ecx
            //   e8????????           |                     
            //   56                   | push                esi

    condition:
        7 of them and filesize < 167936
}