rule win_jackpos_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.jackpos."
        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.jackpos"
        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 = { 8bc6 8be5 5d c20800 8d4604 c60000 5f }
            // n = 7, score = 100
            //   8bc6                 | mov                 eax, esi
            //   8be5                 | mov                 esp, ebp
            //   5d                   | pop                 ebp
            //   c20800               | ret                 8
            //   8d4604               | lea                 eax, [esi + 4]
            //   c60000               | mov                 byte ptr [eax], 0
            //   5f                   | pop                 edi

        $sequence_1 = { 50 51 56 52 8d4c2470 e8???????? }
            // n = 6, score = 100
            //   50                   | push                eax
            //   51                   | push                ecx
            //   56                   | push                esi
            //   52                   | push                edx
            //   8d4c2470             | lea                 ecx, [esp + 0x70]
            //   e8????????           |                     

        $sequence_2 = { 85c0 0f8494000000 8b5934 8b7120 8b1b 8b36 }
            // n = 6, score = 100
            //   85c0                 | test                eax, eax
            //   0f8494000000         | je                  0x9a
            //   8b5934               | mov                 ebx, dword ptr [ecx + 0x34]
            //   8b7120               | mov                 esi, dword ptr [ecx + 0x20]
            //   8b1b                 | mov                 ebx, dword ptr [ebx]
            //   8b36                 | mov                 esi, dword ptr [esi]

        $sequence_3 = { 8b7508 eb02 33ff c745fc02000000 893e f6c302 7412 }
            // n = 7, score = 100
            //   8b7508               | mov                 esi, dword ptr [ebp + 8]
            //   eb02                 | jmp                 4
            //   33ff                 | xor                 edi, edi
            //   c745fc02000000       | mov                 dword ptr [ebp - 4], 2
            //   893e                 | mov                 dword ptr [esi], edi
            //   f6c302               | test                bl, 2
            //   7412                 | je                  0x14

        $sequence_4 = { 8b4604 33c9 66890c03 5f 8bc6 5e }
            // n = 6, score = 100
            //   8b4604               | mov                 eax, dword ptr [esi + 4]
            //   33c9                 | xor                 ecx, ecx
            //   66890c03             | mov                 word ptr [ebx + eax], cx
            //   5f                   | pop                 edi
            //   8bc6                 | mov                 eax, esi
            //   5e                   | pop                 esi

        $sequence_5 = { e8???????? 68???????? 8d54244c 52 c744245024c74100 e8???????? 8b8c2490000000 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   68????????           |                     
            //   8d54244c             | lea                 edx, [esp + 0x4c]
            //   52                   | push                edx
            //   c744245024c74100     | mov                 dword ptr [esp + 0x50], 0x41c724
            //   e8????????           |                     
            //   8b8c2490000000       | mov                 ecx, dword ptr [esp + 0x90]

        $sequence_6 = { 1bc0 83e0fe 40 85c0 751a b803000000 3bf8 }
            // n = 7, score = 100
            //   1bc0                 | sbb                 eax, eax
            //   83e0fe               | and                 eax, 0xfffffffe
            //   40                   | inc                 eax
            //   85c0                 | test                eax, eax
            //   751a                 | jne                 0x1c
            //   b803000000           | mov                 eax, 3
            //   3bf8                 | cmp                 edi, eax

        $sequence_7 = { 3b04cdb0f14100 7413 41 83f92d }
            // n = 4, score = 100
            //   3b04cdb0f14100       | cmp                 eax, dword ptr [ecx*8 + 0x41f1b0]
            //   7413                 | je                  0x15
            //   41                   | inc                 ecx
            //   83f92d               | cmp                 ecx, 0x2d

        $sequence_8 = { 3bc3 7711 8bc1 83fa08 7303 8d45d4 8d0478 }
            // n = 7, score = 100
            //   3bc3                 | cmp                 eax, ebx
            //   7711                 | ja                  0x13
            //   8bc1                 | mov                 eax, ecx
            //   83fa08               | cmp                 edx, 8
            //   7303                 | jae                 5
            //   8d45d4               | lea                 eax, [ebp - 0x2c]
            //   8d0478               | lea                 eax, [eax + edi*2]

        $sequence_9 = { ff34c540f44100 ff15???????? 5d c3 6a0c 68???????? e8???????? }
            // n = 7, score = 100
            //   ff34c540f44100       | push                dword ptr [eax*8 + 0x41f440]
            //   ff15????????         |                     
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   6a0c                 | push                0xc
            //   68????????           |                     
            //   e8????????           |                     

    condition:
        7 of them and filesize < 319488
}