rule win_sys10_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        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 = "20230124"
        malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686"
        malpedia_version = "20230125"
        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 = { 57 52 53 ffd5 85c0 }
            // n = 5, score = 200
            //   57                   | push                edi
            //   52                   | push                edx
            //   53                   | push                ebx
            //   ffd5                 | call                ebp
            //   85c0                 | test                eax, eax

        $sequence_1 = { 51 6800400000 52 50 e8???????? 8bf8 }
            // n = 6, score = 200
            //   51                   | push                ecx
            //   6800400000           | push                0x4000
            //   52                   | push                edx
            //   50                   | push                eax
            //   e8????????           |                     
            //   8bf8                 | mov                 edi, eax

        $sequence_2 = { ffd7 8b5304 52 ffd7 8b4308 50 ffd7 }
            // n = 7, score = 200
            //   ffd7                 | call                edi
            //   8b5304               | mov                 edx, dword ptr [ebx + 4]
            //   52                   | push                edx
            //   ffd7                 | call                edi
            //   8b4308               | mov                 eax, dword ptr [ebx + 8]
            //   50                   | push                eax
            //   ffd7                 | call                edi

        $sequence_3 = { 7407 53 ff15???????? 8b06 50 }
            // n = 5, score = 200
            //   7407                 | je                  9
            //   53                   | push                ebx
            //   ff15????????         |                     
            //   8b06                 | mov                 eax, dword ptr [esi]
            //   50                   | push                eax

        $sequence_4 = { 85c0 7406 33c0 83c40c c3 8b442408 8d4c2404 }
            // n = 7, score = 200
            //   85c0                 | test                eax, eax
            //   7406                 | je                  8
            //   33c0                 | xor                 eax, eax
            //   83c40c               | add                 esp, 0xc
            //   c3                   | ret                 
            //   8b442408             | mov                 eax, dword ptr [esp + 8]
            //   8d4c2404             | lea                 ecx, [esp + 4]

        $sequence_5 = { 6a00 8bf8 ffd3 894610 89442418 8d4608 8d54240c }
            // n = 7, score = 200
            //   6a00                 | push                0
            //   8bf8                 | mov                 edi, eax
            //   ffd3                 | call                ebx
            //   894610               | mov                 dword ptr [esi + 0x10], eax
            //   89442418             | mov                 dword ptr [esp + 0x18], eax
            //   8d4608               | lea                 eax, [esi + 8]
            //   8d54240c             | lea                 edx, [esp + 0xc]

        $sequence_6 = { 50 8d8c245c040000 68???????? 51 }
            // n = 4, score = 200
            //   50                   | push                eax
            //   8d8c245c040000       | lea                 ecx, [esp + 0x45c]
            //   68????????           |                     
            //   51                   | push                ecx

        $sequence_7 = { 894c242c 89742438 ff15???????? 6aff 57 ff15???????? }
            // n = 6, score = 200
            //   894c242c             | mov                 dword ptr [esp + 0x2c], ecx
            //   89742438             | mov                 dword ptr [esp + 0x38], esi
            //   ff15????????         |                     
            //   6aff                 | push                -1
            //   57                   | push                edi
            //   ff15????????         |                     

        $sequence_8 = { 6a00 897c2434 894c242c 89742438 }
            // n = 4, score = 200
            //   6a00                 | push                0
            //   897c2434             | mov                 dword ptr [esp + 0x34], edi
            //   894c242c             | mov                 dword ptr [esp + 0x2c], ecx
            //   89742438             | mov                 dword ptr [esp + 0x38], esi

        $sequence_9 = { 33c0 59 c20c00 8b442410 c70044020000 b801000000 }
            // n = 6, score = 200
            //   33c0                 | xor                 eax, eax
            //   59                   | pop                 ecx
            //   c20c00               | ret                 0xc
            //   8b442410             | mov                 eax, dword ptr [esp + 0x10]
            //   c70044020000         | mov                 dword ptr [eax], 0x244
            //   b801000000           | mov                 eax, 1

    condition:
        7 of them and filesize < 286720
}