rule win_playwork_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.playwork."
        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.playwork"
        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 = { 8b45fc 53 6a00 8b40fc 8945ec 8d85b8fbffff 50 }
            // n = 7, score = 100
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   53                   | push                ebx
            //   6a00                 | push                0
            //   8b40fc               | mov                 eax, dword ptr [eax - 4]
            //   8945ec               | mov                 dword ptr [ebp - 0x14], eax
            //   8d85b8fbffff         | lea                 eax, [ebp - 0x448]
            //   50                   | push                eax

        $sequence_1 = { 68???????? 6802000080 ff15???????? 85c0 0f85bf000000 53 57 }
            // n = 7, score = 100
            //   68????????           |                     
            //   6802000080           | push                0x80000002
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   0f85bf000000         | jne                 0xc5
            //   53                   | push                ebx
            //   57                   | push                edi

        $sequence_2 = { 744c 56 6a00 ff742424 e8???????? }
            // n = 5, score = 100
            //   744c                 | je                  0x4e
            //   56                   | push                esi
            //   6a00                 | push                0
            //   ff742424             | push                dword ptr [esp + 0x24]
            //   e8????????           |                     

        $sequence_3 = { 746b 8d4601 50 53 57 e8???????? }
            // n = 6, score = 100
            //   746b                 | je                  0x6d
            //   8d4601               | lea                 eax, [esi + 1]
            //   50                   | push                eax
            //   53                   | push                ebx
            //   57                   | push                edi
            //   e8????????           |                     

        $sequence_4 = { 895dfc 895df0 ffd0 395df0 c645fc01 895de8 750a }
            // n = 7, score = 100
            //   895dfc               | mov                 dword ptr [ebp - 4], ebx
            //   895df0               | mov                 dword ptr [ebp - 0x10], ebx
            //   ffd0                 | call                eax
            //   395df0               | cmp                 dword ptr [ebp - 0x10], ebx
            //   c645fc01             | mov                 byte ptr [ebp - 4], 1
            //   895de8               | mov                 dword ptr [ebp - 0x18], ebx
            //   750a                 | jne                 0xc

        $sequence_5 = { 85c0 0f842d030000 6a09 33c0 }
            // n = 4, score = 100
            //   85c0                 | test                eax, eax
            //   0f842d030000         | je                  0x333
            //   6a09                 | push                9
            //   33c0                 | xor                 eax, eax

        $sequence_6 = { 53 51 8d4dc8 51 53 56 ff5054 }
            // n = 7, score = 100
            //   53                   | push                ebx
            //   51                   | push                ecx
            //   8d4dc8               | lea                 ecx, [ebp - 0x38]
            //   51                   | push                ecx
            //   53                   | push                ebx
            //   56                   | push                esi
            //   ff5054               | call                dword ptr [eax + 0x54]

        $sequence_7 = { ffd3 8d85f8fdffff 50 68???????? ff15???????? 683c0d0000 68???????? }
            // n = 7, score = 100
            //   ffd3                 | call                ebx
            //   8d85f8fdffff         | lea                 eax, [ebp - 0x208]
            //   50                   | push                eax
            //   68????????           |                     
            //   ff15????????         |                     
            //   683c0d0000           | push                0xd3c
            //   68????????           |                     

        $sequence_8 = { 7406 8b08 50 ff5108 c3 51 51 }
            // n = 7, score = 100
            //   7406                 | je                  8
            //   8b08                 | mov                 ecx, dword ptr [eax]
            //   50                   | push                eax
            //   ff5108               | call                dword ptr [ecx + 8]
            //   c3                   | ret                 
            //   51                   | push                ecx
            //   51                   | push                ecx

        $sequence_9 = { 3330 83c010 8975dc 0fb6f3 8b5df4 8b34b534533f00 }
            // n = 6, score = 100
            //   3330                 | xor                 esi, dword ptr [eax]
            //   83c010               | add                 eax, 0x10
            //   8975dc               | mov                 dword ptr [ebp - 0x24], esi
            //   0fb6f3               | movzx               esi, bl
            //   8b5df4               | mov                 ebx, dword ptr [ebp - 0xc]
            //   8b34b534533f00       | mov                 esi, dword ptr [esi*4 + 0x3f5334]

    condition:
        7 of them and filesize < 360448
}