rule win_splinter_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.splinter."
        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.splinter"
        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 = { e8???????? 488d8fa0010000 e8???????? 4889fe 488b9790000000 488d045500000000 4885c0 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   488d8fa0010000       | dec                 esp
            //   e8????????           |                     
            //   4889fe               | mov                 eax, dword ptr [ebp + 0x7d8]
            //   488b9790000000       | dec                 eax
            //   488d045500000000     | lea                 ecx, [ebp + 0x7f8]
            //   4885c0               | jmp                 0x235

        $sequence_1 = { e8???????? e9???????? 48894d68 48894db8 488d45c0 488945e8 488d05d3070000 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   e9????????           |                     
            //   48894d68             | pop                 edi
            //   48894db8             | pop                 esi
            //   488d45c0             | inc                 ecx
            //   488945e8             | pop                 esp
            //   488d05d3070000       | mov                 byte ptr [ebp + 0x7aa], 1

        $sequence_2 = { e8???????? e9???????? 48c745f800000000 c6455f01 488d05e4713b00 4889442420 488d55dc }
            // n = 7, score = 100
            //   e8????????           |                     
            //   e9????????           |                     
            //   48c745f800000000     | dec                 cx
            //   c6455f01             | movd                mm1, ecx
            //   488d05e4713b00       | inc                 esp
            //   4889442420           | mov                 dword ptr [ebp + 0x28], ebx
            //   488d55dc             | mov                 dword ptr [ebp + 0xc0], ecx

        $sequence_3 = { e9???????? 488b4708 488b4f10 4885c9 0f84f1000000 488d14cd00000000 488d1492 }
            // n = 7, score = 100
            //   e9????????           |                     
            //   488b4708             | jne                 0x947
            //   488b4f10             | dec                 eax
            //   4885c9               | mov                 dword ptr [ebx + 0x10], edx
            //   0f84f1000000         | dec                 ecx
            //   488d14cd00000000     | mov                 edx, dword ptr [eax]
            //   488d1492             | dec                 eax

        $sequence_4 = { f048ff08 0f8485000000 e9???????? 49833900 0f8482000000 498b4108 488945f0 }
            // n = 7, score = 100
            //   f048ff08             | jne                 0xfffffbd9
            //   0f8485000000         |                     
            //   e9????????           |                     
            //   49833900             | je                  0x8b
            //   0f8482000000         | dec                 ecx
            //   498b4108             | cmp                 dword ptr [ecx], 0
            //   488945f0             | je                  0x88

        $sequence_5 = { f048ff09 7510 488b45f8 488b90a0000000 e8???????? 48b80200000000000080 488b4df8 }
            // n = 7, score = 100
            //   f048ff09             | add                 esp, 0x20
            //   7510                 | pop                 esi
            //   488b45f8             | nop                 
            //   488b90a0000000       | dec                 eax
            //   e8????????           |                     
            //   48b80200000000000080     | mov    eax, dword ptr [ebp - 8]
            //   488b4df8             | dec                 eax

        $sequence_6 = { f6c301 7418 488d4d40 e8???????? 889d58040000 4883c428 5b }
            // n = 7, score = 100
            //   f6c301               | dec                 eax
            //   7418                 | mov                 ecx, dword ptr [edi + 0x20]
            //   488d4d40             | dec                 esp
            //   e8????????           |                     
            //   889d58040000         | mov                 eax, esi
            //   4883c428             | dec                 eax
            //   5b                   | sub                 eax, ecx

        $sequence_7 = { ff5028 89c7 488b5518 4889d0 48f7d8 7011 730f }
            // n = 7, score = 100
            //   ff5028               | dec                 eax
            //   89c7                 | mov                 dword ptr [ebp + 0x450], ecx
            //   488b5518             | dec                 esp
            //   4889d0               | mov                 dword ptr [ebp + 0x458], esi
            //   48f7d8               | dec                 eax
            //   7011                 | mov                 dword ptr [esi + 0x10], 0
            //   730f                 | call                dword ptr [eax + 0x18]

        $sequence_8 = { eb4b c685a703000001 488d0d95fa4000 e8???????? eb36 c685a703000001 488d0d68fa4000 }
            // n = 7, score = 100
            //   eb4b                 | mov                 byte ptr [ecx], al
            //   c685a703000001       | dec                 eax
            //   488d0d95fa4000       | mov                 eax, dword ptr [ebp + 0x1a38]
            //   e8????????           |                     
            //   eb36                 | movzx               eax, byte ptr [eax + 0x61]
            //   c685a703000001       | jmp                 0x230
            //   488d0d68fa4000       | mov                 ecx, 8

        $sequence_9 = { 7f24 488d05aaf83600 4889442420 4c89f1 4889da 4989f8 4989d9 }
            // n = 7, score = 100
            //   7f24                 | dec                 eax
            //   488d05aaf83600       | mov                 ecx, ebx
            //   4889442420           | dec                 eax
            //   4c89f1               | mov                 edx, edi
            //   4889da               | jl                  0x399
            //   4989f8               | dec                 ebp
            //   4989d9               | test                edi, edi

    condition:
        7 of them and filesize < 20177920
}