rule win_playwork_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        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 = "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 = { 59 837c242000 744c 56 6a00 ff742428 e8???????? }
            // n = 7, score = 100
            //   59                   | pop                 ecx
            //   837c242000           | cmp                 dword ptr [esp + 0x20], 0
            //   744c                 | je                  0x4e
            //   56                   | push                esi
            //   6a00                 | push                0
            //   ff742428             | push                dword ptr [esp + 0x28]
            //   e8????????           |                     

        $sequence_1 = { 8d45bc 56 50 897510 ff7308 897508 }
            // n = 6, score = 100
            //   8d45bc               | lea                 eax, [ebp - 0x44]
            //   56                   | push                esi
            //   50                   | push                eax
            //   897510               | mov                 dword ptr [ebp + 0x10], esi
            //   ff7308               | push                dword ptr [ebx + 8]
            //   897508               | mov                 dword ptr [ebp + 8], esi

        $sequence_2 = { 53 ffd7 ff742418 e8???????? 8b2d???????? 59 837c241c00 }
            // n = 7, score = 100
            //   53                   | push                ebx
            //   ffd7                 | call                edi
            //   ff742418             | push                dword ptr [esp + 0x18]
            //   e8????????           |                     
            //   8b2d????????         |                     
            //   59                   | pop                 ecx
            //   837c241c00           | cmp                 dword ptr [esp + 0x1c], 0

        $sequence_3 = { 8b45f8 6a2c ff7008 ffd7 }
            // n = 4, score = 100
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   6a2c                 | push                0x2c
            //   ff7008               | push                dword ptr [eax + 8]
            //   ffd7                 | call                edi

        $sequence_4 = { 57 ff75e8 ff15???????? 3d03010000 0f8442030000 8d8598f9ffff 50 }
            // n = 7, score = 100
            //   57                   | push                edi
            //   ff75e8               | push                dword ptr [ebp - 0x18]
            //   ff15????????         |                     
            //   3d03010000           | cmp                 eax, 0x103
            //   0f8442030000         | je                  0x348
            //   8d8598f9ffff         | lea                 eax, [ebp - 0x668]
            //   50                   | push                eax

        $sequence_5 = { 57 8d450c 56 50 bf08010000 8d85f8feffff 57 }
            // n = 7, score = 100
            //   57                   | push                edi
            //   8d450c               | lea                 eax, [ebp + 0xc]
            //   56                   | push                esi
            //   50                   | push                eax
            //   bf08010000           | mov                 edi, 0x108
            //   8d85f8feffff         | lea                 eax, [ebp - 0x108]
            //   57                   | push                edi

        $sequence_6 = { ffd6 03d8 81fb00a00000 0f8d09010000 8d85e8f7ffff 50 ff7508 }
            // n = 7, score = 100
            //   ffd6                 | call                esi
            //   03d8                 | add                 ebx, eax
            //   81fb00a00000         | cmp                 ebx, 0xa000
            //   0f8d09010000         | jge                 0x10f
            //   8d85e8f7ffff         | lea                 eax, [ebp - 0x818]
            //   50                   | push                eax
            //   ff7508               | push                dword ptr [ebp + 8]

        $sequence_7 = { 0fb6c0 33149d5c703f00 3314855c6c3f00 3351f0 3317 83c704 8bc2 }
            // n = 7, score = 100
            //   0fb6c0               | movzx               eax, al
            //   33149d5c703f00       | xor                 edx, dword ptr [ebx*4 + 0x3f705c]
            //   3314855c6c3f00       | xor                 edx, dword ptr [eax*4 + 0x3f6c5c]
            //   3351f0               | xor                 edx, dword ptr [ecx - 0x10]
            //   3317                 | xor                 edx, dword ptr [edi]
            //   83c704               | add                 edi, 4
            //   8bc2                 | mov                 eax, edx

        $sequence_8 = { 83e0f0 5f 7624 53 8b5c2410 56 }
            // n = 6, score = 100
            //   83e0f0               | and                 eax, 0xfffffff0
            //   5f                   | pop                 edi
            //   7624                 | jbe                 0x26
            //   53                   | push                ebx
            //   8b5c2410             | mov                 ebx, dword ptr [esp + 0x10]
            //   56                   | push                esi

        $sequence_9 = { 8b1d???????? 56 ffd3 d1e0 50 56 }
            // n = 6, score = 100
            //   8b1d????????         |                     
            //   56                   | push                esi
            //   ffd3                 | call                ebx
            //   d1e0                 | shl                 eax, 1
            //   50                   | push                eax
            //   56                   | push                esi

    condition:
        7 of them and filesize < 360448
}