rule win_hopscotch_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        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 = "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 = { 7516 c1e504 83e804 f7c5000000f0 }
            // n = 4, score = 100
            //   7516                 | jne                 0x18
            //   c1e504               | shl                 ebp, 4
            //   83e804               | sub                 eax, 4
            //   f7c5000000f0         | test                ebp, 0xf0000000

        $sequence_1 = { 85c0 0f86f0000000 83c003 c1e802 89442418 }
            // n = 5, score = 100
            //   85c0                 | test                eax, eax
            //   0f86f0000000         | jbe                 0xf6
            //   83c003               | add                 eax, 3
            //   c1e802               | shr                 eax, 2
            //   89442418             | mov                 dword ptr [esp + 0x18], eax

        $sequence_2 = { e8???????? 68???????? e8???????? 83c404 85f6 7403 56 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   68????????           |                     
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   85f6                 | test                esi, esi
            //   7403                 | je                  5
            //   56                   | push                esi

        $sequence_3 = { 83c408 68???????? e8???????? 8d8c249c020000 6801010000 }
            // n = 5, score = 100
            //   83c408               | add                 esp, 8
            //   68????????           |                     
            //   e8????????           |                     
            //   8d8c249c020000       | lea                 ecx, [esp + 0x29c]
            //   6801010000           | push                0x101

        $sequence_4 = { 56 53 8d4c2414 6a08 51 e8???????? }
            // n = 6, score = 100
            //   56                   | push                esi
            //   53                   | push                ebx
            //   8d4c2414             | lea                 ecx, [esp + 0x14]
            //   6a08                 | push                8
            //   51                   | push                ecx
            //   e8????????           |                     

        $sequence_5 = { 6a00 6a00 8d9424b4000000 6a00 }
            // n = 4, score = 100
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   8d9424b4000000       | lea                 edx, [esp + 0xb4]
            //   6a00                 | push                0

        $sequence_6 = { 833d????????01 750d 8b442404 50 e8???????? 83c404 }
            // n = 6, score = 100
            //   833d????????01       |                     
            //   750d                 | jne                 0xf
            //   8b442404             | mov                 eax, dword ptr [esp + 4]
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c404               | add                 esp, 4

        $sequence_7 = { 8885d8feffff 3c01 0f85cf000000 6804010000 68???????? e8???????? 83c408 }
            // n = 7, score = 100
            //   8885d8feffff         | mov                 byte ptr [ebp - 0x128], al
            //   3c01                 | cmp                 al, 1
            //   0f85cf000000         | jne                 0xd5
            //   6804010000           | push                0x104
            //   68????????           |                     
            //   e8????????           |                     
            //   83c408               | add                 esp, 8

        $sequence_8 = { 83f904 7605 b904000000 f7d8 1bc0 5e }
            // n = 6, score = 100
            //   83f904               | cmp                 ecx, 4
            //   7605                 | jbe                 7
            //   b904000000           | mov                 ecx, 4
            //   f7d8                 | neg                 eax
            //   1bc0                 | sbb                 eax, eax
            //   5e                   | pop                 esi

        $sequence_9 = { 85c9 740a 6a00 51 }
            // n = 4, score = 100
            //   85c9                 | test                ecx, ecx
            //   740a                 | je                  0xc
            //   6a00                 | push                0
            //   51                   | push                ecx

    condition:
        7 of them and filesize < 1143808
}