rule win_sys10_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        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 = "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 = { 8b442410 8b4c240c 8b542408 6a03 }
            // n = 4, score = 200
            //   8b442410             | mov                 eax, dword ptr [esp + 0x10]
            //   8b4c240c             | mov                 ecx, dword ptr [esp + 0xc]
            //   8b542408             | mov                 edx, dword ptr [esp + 8]
            //   6a03                 | push                3

        $sequence_1 = { c744245444000000 ff15???????? 8b5610 8b44241c 8902 8b4e0c 51 }
            // n = 7, score = 200
            //   c744245444000000     | mov                 dword ptr [esp + 0x54], 0x44
            //   ff15????????         |                     
            //   8b5610               | mov                 edx, dword ptr [esi + 0x10]
            //   8b44241c             | mov                 eax, dword ptr [esp + 0x1c]
            //   8902                 | mov                 dword ptr [edx], eax
            //   8b4e0c               | mov                 ecx, dword ptr [esi + 0xc]
            //   51                   | push                ecx

        $sequence_2 = { ff15???????? 68b80b0000 ff15???????? 6800280000 }
            // n = 4, score = 200
            //   ff15????????         |                     
            //   68b80b0000           | push                0xbb8
            //   ff15????????         |                     
            //   6800280000           | push                0x2800

        $sequence_3 = { 837e04ff 740b 8b16 52 e8???????? }
            // n = 5, score = 200
            //   837e04ff             | cmp                 dword ptr [esi + 4], -1
            //   740b                 | je                  0xd
            //   8b16                 | mov                 edx, dword ptr [esi]
            //   52                   | push                edx
            //   e8????????           |                     

        $sequence_4 = { 51 6a00 56 e8???????? 57 }
            // n = 5, score = 200
            //   51                   | push                ecx
            //   6a00                 | push                0
            //   56                   | push                esi
            //   e8????????           |                     
            //   57                   | push                edi

        $sequence_5 = { 51 6a05 52 ffd6 }
            // n = 4, score = 200
            //   51                   | push                ecx
            //   6a05                 | push                5
            //   52                   | push                edx
            //   ffd6                 | call                esi

        $sequence_6 = { 837e04ff 740b 8b16 52 e8???????? 83c404 }
            // n = 6, score = 200
            //   837e04ff             | cmp                 dword ptr [esi + 4], -1
            //   740b                 | je                  0xd
            //   8b16                 | mov                 edx, dword ptr [esi]
            //   52                   | push                edx
            //   e8????????           |                     
            //   83c404               | add                 esp, 4

        $sequence_7 = { 897c2434 894c242c 89742438 ff15???????? }
            // n = 4, score = 200
            //   897c2434             | mov                 dword ptr [esp + 0x34], edi
            //   894c242c             | mov                 dword ptr [esp + 0x2c], ecx
            //   89742438             | mov                 dword ptr [esp + 0x38], esi
            //   ff15????????         |                     

        $sequence_8 = { 51 6a05 52 ffd6 8b4b08 }
            // n = 5, score = 200
            //   51                   | push                ecx
            //   6a05                 | push                5
            //   52                   | push                edx
            //   ffd6                 | call                esi
            //   8b4b08               | mov                 ecx, dword ptr [ebx + 8]

        $sequence_9 = { ffd7 8b4304 50 ffd7 8b4b08 51 ffd7 }
            // n = 7, score = 200
            //   ffd7                 | call                edi
            //   8b4304               | mov                 eax, dword ptr [ebx + 4]
            //   50                   | push                eax
            //   ffd7                 | call                edi
            //   8b4b08               | mov                 ecx, dword ptr [ebx + 8]
            //   51                   | push                ecx
            //   ffd7                 | call                edi

    condition:
        7 of them and filesize < 286720
}