rule win_sys10_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-04-08"
        version = "1"
        description = "Detects win.sys10."
        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.sys10"
        malpedia_rule_date = "20220405"
        malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a"
        malpedia_version = "20220411"
        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 = { ff15???????? 85c0 7406 33c0 83c40c c3 8b442408 }
            // n = 7, score = 200
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   7406                 | je                  8
            //   33c0                 | xor                 eax, eax
            //   83c40c               | add                 esp, 0xc
            //   c3                   | ret                 
            //   8b442408             | mov                 eax, dword ptr [esp + 8]

        $sequence_1 = { 8b06 50 e8???????? 8b442418 }
            // n = 4, score = 200
            //   8b06                 | mov                 eax, dword ptr [esi]
            //   50                   | push                eax
            //   e8????????           |                     
            //   8b442418             | mov                 eax, dword ptr [esp + 0x18]

        $sequence_2 = { 53 33db ff15???????? 33c9 89442408 66894c2404 }
            // n = 6, score = 200
            //   53                   | push                ebx
            //   33db                 | xor                 ebx, ebx
            //   ff15????????         |                     
            //   33c9                 | xor                 ecx, ecx
            //   89442408             | mov                 dword ptr [esp + 8], eax
            //   66894c2404           | mov                 word ptr [esp + 4], cx

        $sequence_3 = { e8???????? 83c404 85c0 74c6 8b4c2410 896e10 }
            // n = 6, score = 200
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   85c0                 | test                eax, eax
            //   74c6                 | je                  0xffffffc8
            //   8b4c2410             | mov                 ecx, dword ptr [esp + 0x10]
            //   896e10               | mov                 dword ptr [esi + 0x10], ebp

        $sequence_4 = { 6810270000 ff15???????? 33c0 59 c20c00 8b442410 c70044020000 }
            // n = 7, score = 200
            //   6810270000           | push                0x2710
            //   ff15????????         |                     
            //   33c0                 | xor                 eax, eax
            //   59                   | pop                 ecx
            //   c20c00               | ret                 0xc
            //   8b442410             | mov                 eax, dword ptr [esp + 0x10]
            //   c70044020000         | mov                 dword ptr [eax], 0x244

        $sequence_5 = { 55 8b2d???????? 56 8b742418 57 8b3d???????? a801 }
            // n = 7, score = 200
            //   55                   | push                ebp
            //   8b2d????????         |                     
            //   56                   | push                esi
            //   8b742418             | mov                 esi, dword ptr [esp + 0x18]
            //   57                   | push                edi
            //   8b3d????????         |                     
            //   a801                 | test                al, 1

        $sequence_6 = { e8???????? 68e8030000 ff15???????? 6800280000 }
            // n = 4, score = 200
            //   e8????????           |                     
            //   68e8030000           | push                0x3e8
            //   ff15????????         |                     
            //   6800280000           | push                0x2800

        $sequence_7 = { 897c2434 894c242c 89742438 ff15???????? 6aff }
            // n = 5, score = 200
            //   897c2434             | mov                 dword ptr [esp + 0x34], edi
            //   894c242c             | mov                 dword ptr [esp + 0x2c], ecx
            //   89742438             | mov                 dword ptr [esp + 0x38], esi
            //   ff15????????         |                     
            //   6aff                 | push                -1

        $sequence_8 = { 6810270000 ff15???????? 33c0 59 }
            // n = 4, score = 200
            //   6810270000           | push                0x2710
            //   ff15????????         |                     
            //   33c0                 | xor                 eax, eax
            //   59                   | pop                 ecx

        $sequence_9 = { 59 c20c00 8b442410 c70044020000 }
            // n = 4, score = 200
            //   59                   | pop                 ecx
            //   c20c00               | ret                 0xc
            //   8b442410             | mov                 eax, dword ptr [esp + 0x10]
            //   c70044020000         | mov                 dword ptr [eax], 0x244

    condition:
        7 of them and filesize < 286720
}