rule win_sync_scheduler_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.sync_scheduler."
        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.sync_scheduler"
        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 = { 4889742420 4533c9 4c8d05b9970000 488d15d2970000 498bcd ff15???????? }
            // n = 6, score = 100
            //   4889742420           | dec                 eax
            //   4533c9               | cmp                 eax, 0x1f
            //   4c8d05b9970000       | jbe                 0x15f
            //   488d15d2970000       | int3                
            //   498bcd               | dec                 eax
            //   ff15????????         |                     

        $sequence_1 = { 0f1185e0000000 0f57c9 f30f7f8df0000000 41b856000000 488d150c910000 488d8de0000000 e8???????? }
            // n = 7, score = 100
            //   0f1185e0000000       | add                 al, 3
            //   0f57c9               | xor                 al, 0x65
            //   f30f7f8df0000000     | mov                 byte ptr [esp + 0x3f], al
            //   41b856000000         | mov                 eax, dword ptr [esp + 0x38]
            //   488d150c910000       | add                 al, 4
            //   488d8de0000000       | xor                 al, 0x72
            //   e8????????           |                     

        $sequence_2 = { 4d3bdf 0f877e000000 498bc7 492bc3 4d85db 0f84a9000000 }
            // n = 6, score = 100
            //   4d3bdf               | lea                 ecx, [ebp + 0x228]
            //   0f877e000000         | dec                 eax
            //   498bc7               | test                eax, eax
            //   492bc3               | jne                 0x425
            //   4d85db               | dec                 eax
            //   0f84a9000000         | mov                 eax, dword ptr [ebp + 0x220]

        $sequence_3 = { 488d542444 488bcb e8???????? 488bd7 488d4d88 ffd0 }
            // n = 6, score = 100
            //   488d542444           | test                eax, eax
            //   488bcb               | je                  0x104
            //   e8????????           |                     
            //   488bd7               | dec                 eax
            //   488d4d88             | lea                 ebx, [eax + 0x27]
            //   ffd0                 | dec                 eax

        $sequence_4 = { 0fb645ab 8bd6 0fb64415ab 8b4da7 32c8 }
            // n = 5, score = 100
            //   0fb645ab             | add                 al, 0xc
            //   8bd6                 | xor                 al, 0x65
            //   0fb64415ab           | mov                 byte ptr [esp + 0x48], al
            //   8b4da7               | mov                 eax, dword ptr [esp + 0x38]
            //   32c8                 | add                 al, 0xd

        $sequence_5 = { 488d4827 483bc8 0f86d0000000 eb0e 48b90000000000000080 }
            // n = 5, score = 100
            //   488d4827             | xorps               xmm0, xmm0
            //   483bc8               | dec                 eax
            //   0f86d0000000         | lea                 edx, [ebx + 8]
            //   eb0e                 | dec                 eax
            //   48b90000000000000080     | mov    dword ptr [ebx], ecx

        $sequence_6 = { 33d2 b900130000 ff15???????? 488b4c2440 ff15???????? 498bcf }
            // n = 6, score = 100
            //   33d2                 | movups              xmmword ptr [ebp + 0x200], xmm0
            //   b900130000           | movdqu              xmmword ptr [ebp + 0x210], xmm1
            //   ff15????????         |                     
            //   488b4c2440           | mov                 byte ptr [ebp + 0x200], 0
            //   ff15????????         |                     
            //   498bcf               | dec                 eax

        $sequence_7 = { 4883c0f8 4883f81f 0f8780000000 e8???????? 4c897df0 48c745f80f000000 c645e000 }
            // n = 7, score = 100
            //   4883c0f8             | mov                 ecx, eax
            //   4883f81f             | dec                 eax
            //   0f8780000000         | add                 ecx, eax
            //   e8????????           |                     
            //   4c897df0             | inc                 ebp
            //   48c745f80f000000     | xor                 eax, eax
            //   c645e000             | inc                 ecx

        $sequence_8 = { ebad ff15???????? cc 4885c9 }
            // n = 4, score = 100
            //   ebad                 | dec                 eax
            //   ff15????????         |                     
            //   cc                   | mov                 edx, dword ptr [ebp + 0x98]
            //   4885c9               | dec                 eax

        $sequence_9 = { 02ca 32c8 884c15ac 48ffc2 4883fa10 }
            // n = 5, score = 100
            //   02ca                 | mov                 byte ptr [ebp - 0x14], 0x7b
            //   32c8                 | mov                 byte ptr [ebp - 0x13], 0x77
            //   884c15ac             | mov                 byte ptr [ebp - 0x12], 0x6e
            //   48ffc2               | mov                 byte ptr [ebp - 0x14], 0x7b
            //   4883fa10             | mov                 byte ptr [ebp - 0x13], 0x77

    condition:
        7 of them and filesize < 156672
}