rule win_ployx_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.ployx."
        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.ployx"
        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 = { e8???????? 59 59 ff7528 8d7508 8d8500ffffff }
            // n = 6, score = 100
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   59                   | pop                 ecx
            //   ff7528               | push                dword ptr [ebp + 0x28]
            //   8d7508               | lea                 esi, [ebp + 8]
            //   8d8500ffffff         | lea                 eax, [ebp - 0x100]

        $sequence_1 = { 8bc6 c1f905 83e01f 8b0c8d007d2700 8d04c0 f644810401 741d }
            // n = 7, score = 100
            //   8bc6                 | mov                 eax, esi
            //   c1f905               | sar                 ecx, 5
            //   83e01f               | and                 eax, 0x1f
            //   8b0c8d007d2700       | mov                 ecx, dword ptr [ecx*4 + 0x277d00]
            //   8d04c0               | lea                 eax, [eax + eax*8]
            //   f644810401           | test                byte ptr [ecx + eax*4 + 4], 1
            //   741d                 | je                  0x1f

        $sequence_2 = { 8901 83c213 83c104 4e 75ed 5e }
            // n = 6, score = 100
            //   8901                 | mov                 dword ptr [ecx], eax
            //   83c213               | add                 edx, 0x13
            //   83c104               | add                 ecx, 4
            //   4e                   | dec                 esi
            //   75ed                 | jne                 0xffffffef
            //   5e                   | pop                 esi

        $sequence_3 = { 7cf1 393d???????? 7520 53 b9???????? b800020000 }
            // n = 6, score = 100
            //   7cf1                 | jl                  0xfffffff3
            //   393d????????         |                     
            //   7520                 | jne                 0x22
            //   53                   | push                ebx
            //   b9????????           |                     
            //   b800020000           | mov                 eax, 0x200

        $sequence_4 = { 3c2f 7404 3c2d 7513 8b4df4 03cb 8801 }
            // n = 7, score = 100
            //   3c2f                 | cmp                 al, 0x2f
            //   7404                 | je                  6
            //   3c2d                 | cmp                 al, 0x2d
            //   7513                 | jne                 0x15
            //   8b4df4               | mov                 ecx, dword ptr [ebp - 0xc]
            //   03cb                 | add                 ecx, ebx
            //   8801                 | mov                 byte ptr [ecx], al

        $sequence_5 = { e8???????? 85c0 744c 8b400c 6a04 }
            // n = 5, score = 100
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   744c                 | je                  0x4e
            //   8b400c               | mov                 eax, dword ptr [eax + 0xc]
            //   6a04                 | push                4

        $sequence_6 = { e8???????? 83f8ff 8945f8 0f8498010000 68???????? }
            // n = 5, score = 100
            //   e8????????           |                     
            //   83f8ff               | cmp                 eax, -1
            //   8945f8               | mov                 dword ptr [ebp - 8], eax
            //   0f8498010000         | je                  0x19e
            //   68????????           |                     

        $sequence_7 = { 50 e8???????? 59 8d8500ffffff 59 ff7508 8bce }
            // n = 7, score = 100
            //   50                   | push                eax
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   8d8500ffffff         | lea                 eax, [ebp - 0x100]
            //   59                   | pop                 ecx
            //   ff7508               | push                dword ptr [ebp + 8]
            //   8bce                 | mov                 ecx, esi

        $sequence_8 = { 3b0d???????? 57 7358 8bc1 c1f805 8d3c85007d2700 8bc1 }
            // n = 7, score = 100
            //   3b0d????????         |                     
            //   57                   | push                edi
            //   7358                 | jae                 0x5a
            //   8bc1                 | mov                 eax, ecx
            //   c1f805               | sar                 eax, 5
            //   8d3c85007d2700       | lea                 edi, [eax*4 + 0x277d00]
            //   8bc1                 | mov                 eax, ecx

        $sequence_9 = { 47 83f80b 0f8777020000 ff248534e32600 80fb31 7c0c 80fb39 }
            // n = 7, score = 100
            //   47                   | inc                 edi
            //   83f80b               | cmp                 eax, 0xb
            //   0f8777020000         | ja                  0x27d
            //   ff248534e32600       | jmp                 dword ptr [eax*4 + 0x26e334]
            //   80fb31               | cmp                 bl, 0x31
            //   7c0c                 | jl                  0xe
            //   80fb39               | cmp                 bl, 0x39

    condition:
        7 of them and filesize < 229376
}