rule win_hopscotch_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.hopscotch."
        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.hopscotch"
        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 = { ffd7 8b742410 8d4c2408 51 6a00 6a00 68???????? }
            // n = 7, score = 100
            //   ffd7                 | call                edi
            //   8b742410             | mov                 esi, dword ptr [esp + 0x10]
            //   8d4c2408             | lea                 ecx, [esp + 8]
            //   51                   | push                ecx
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   68????????           |                     

        $sequence_1 = { 59 8d8530f8ffff 50 68???????? }
            // n = 4, score = 100
            //   59                   | pop                 ecx
            //   8d8530f8ffff         | lea                 eax, [ebp - 0x7d0]
            //   50                   | push                eax
            //   68????????           |                     

        $sequence_2 = { 83c410 85c0 7451 8d54240c 68???????? 52 }
            // n = 6, score = 100
            //   83c410               | add                 esp, 0x10
            //   85c0                 | test                eax, eax
            //   7451                 | je                  0x53
            //   8d54240c             | lea                 edx, [esp + 0xc]
            //   68????????           |                     
            //   52                   | push                edx

        $sequence_3 = { ff15???????? 23f7 8bd0 56 8955f4 ff15???????? }
            // n = 6, score = 100
            //   ff15????????         |                     
            //   23f7                 | and                 esi, edi
            //   8bd0                 | mov                 edx, eax
            //   56                   | push                esi
            //   8955f4               | mov                 dword ptr [ebp - 0xc], edx
            //   ff15????????         |                     

        $sequence_4 = { 8d9424a4010000 52 68???????? e8???????? 83c408 32c0 5f }
            // n = 7, score = 100
            //   8d9424a4010000       | lea                 edx, [esp + 0x1a4]
            //   52                   | push                edx
            //   68????????           |                     
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   32c0                 | xor                 al, al
            //   5f                   | pop                 edi

        $sequence_5 = { 53 e8???????? 83c420 ff15???????? }
            // n = 4, score = 100
            //   53                   | push                ebx
            //   e8????????           |                     
            //   83c420               | add                 esp, 0x20
            //   ff15????????         |                     

        $sequence_6 = { 750c 8d4c2414 51 68???????? eb1e }
            // n = 5, score = 100
            //   750c                 | jne                 0xe
            //   8d4c2414             | lea                 ecx, [esp + 0x14]
            //   51                   | push                ecx
            //   68????????           |                     
            //   eb1e                 | jmp                 0x20

        $sequence_7 = { 8d842498020000 6800010000 52 6aff 50 6a00 }
            // n = 6, score = 100
            //   8d842498020000       | lea                 eax, [esp + 0x298]
            //   6800010000           | push                0x100
            //   52                   | push                edx
            //   6aff                 | push                -1
            //   50                   | push                eax
            //   6a00                 | push                0

        $sequence_8 = { 57 6af6 ff15???????? 8b35???????? 8bf8 8d442408 }
            // n = 6, score = 100
            //   57                   | push                edi
            //   6af6                 | push                -0xa
            //   ff15????????         |                     
            //   8b35????????         |                     
            //   8bf8                 | mov                 edi, eax
            //   8d442408             | lea                 eax, [esp + 8]

        $sequence_9 = { e8???????? 83c404 56 ff15???????? 85c0 751f 68???????? }
            // n = 7, score = 100
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   56                   | push                esi
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   751f                 | jne                 0x21
            //   68????????           |                     

    condition:
        7 of them and filesize < 1143808
}