rule win_darkvnc_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.darkvnc."
        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.darkvnc"
        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 = { 85c0 7425 488b442458 8b4024 2500000080 85c0 740a }
            // n = 7, score = 100
            //   85c0                 | dec                 eax
            //   7425                 | mov                 edx, dword ptr [edx + 0x20]
            //   488b442458           | dec                 eax
            //   8b4024               | mov                 ecx, dword ptr [ecx + 0x10]
            //   2500000080           | inc                 esp
            //   85c0                 | mov                 eax, esi
            //   740a                 | mov                 ebx, esi

        $sequence_1 = { 488903 448bd6 0fb75504 488bc8 0fb77d06 450fb64e0a 48ffc7 }
            // n = 7, score = 100
            //   488903               | dec                 eax
            //   448bd6               | arpl                bx, bx
            //   0fb75504             | dec                 esp
            //   488bc8               | mov                 eax, ebx
            //   0fb77d06             | dec                 eax
            //   450fb64e0a           | add                 dword ptr [edi + 8], ebx
            //   48ffc7               | dec                 eax

        $sequence_2 = { 33d2 ff15???????? 4889abc0060000 4839ab98060000 7407 4889ab98060000 488b93a8060000 }
            // n = 7, score = 100
            //   33d2                 | lea                 edx, [0x15425]
            //   ff15????????         |                     
            //   4889abc0060000       | dec                 eax
            //   4839ab98060000       | lea                 ecx, [esp + 0x20]
            //   7407                 | dec                 eax
            //   4889ab98060000       | lea                 edx, [0x14e53]
            //   488b93a8060000       | dec                 eax

        $sequence_3 = { 488bf8 488bf1 b903000000 f3a4 488d44245b 488bf8 33c0 }
            // n = 7, score = 100
            //   488bf8               | dec                 ecx
            //   488bf1               | arpl                dx, cx
            //   b903000000           | dec                 eax
            //   f3a4                 | arpl                bx, dx
            //   488d44245b           | dec                 ebp
            //   488bf8               | add                 ecx, ebp
            //   33c0                 | dec                 ebp

        $sequence_4 = { 488d4c2420 ff15???????? 488d15035b0100 488d4c2420 ff15???????? 488b5368 488d4c2420 }
            // n = 7, score = 100
            //   488d4c2420           | cmova               eax, ebp
            //   ff15????????         |                     
            //   488d15035b0100       | dec                 ebp
            //   488d4c2420           | test                eax, eax
            //   ff15????????         |                     
            //   488b5368             | je                  0x1bd9
            //   488d4c2420           | dec                 ecx

        $sequence_5 = { 4803c8 48898fe0160000 488bcb e8???????? eb1d 488b05???????? 488bcb }
            // n = 7, score = 100
            //   4803c8               | mov                 eax, dword ptr [esp + 0x78]
            //   48898fe0160000       | je                  0xa91
            //   488bcb               | dec                 eax
            //   e8????????           |                     
            //   eb1d                 | mov                 dword ptr [esp + 0x38], 0
            //   488b05????????       |                     
            //   488bcb               | jmp                 0xa9a

        $sequence_6 = { c3 89542410 53 4883ec20 488b4108 488bd9 4883c004 }
            // n = 7, score = 100
            //   c3                   | mov                 dword ptr [esp + 0x20], 1
            //   89542410             | jmp                 0x1aab
            //   53                   | dec                 eax
            //   4883ec20             | mov                 eax, dword ptr [esp + 0x28]
            //   488b4108             | dec                 eax
            //   488bd9               | mov                 eax, dword ptr [eax + 8]
            //   4883c004             | dec                 eax

        $sequence_7 = { 488b0d???????? 4c8bc6 33d2 ff15???????? 4439a7a0020000 7429 ba11040000 }
            // n = 7, score = 100
            //   488b0d????????       |                     
            //   4c8bc6               | dec                 eax
            //   33d2                 | lea                 edx, [esp + 0x30]
            //   ff15????????         |                     
            //   4439a7a0020000       | mov                 dword ptr [esp + 0x30], 0x3c
            //   7429                 | dec                 eax
            //   ba11040000           | mov                 ecx, esi

        $sequence_8 = { 0f854b010000 488b942490000000 488bcf e8???????? 488be8 }
            // n = 5, score = 100
            //   0f854b010000         | mov                 eax, dword ptr [esp + 0xa0]
            //   488b942490000000     | dec                 esp
            //   488bcf               | mov                 edi, dword ptr [esp + 0xb0]
            //   e8????????           |                     
            //   488be8               | inc                 esp

        $sequence_9 = { 4c63742458 488b5c2450 4863e8 4c8bc5 488bd6 488bcb e8???????? }
            // n = 7, score = 100
            //   4c63742458           | mov                 edx, 1
            //   488b5c2450           | xor                 ecx, ecx
            //   4863e8               | dec                 esp
            //   4c8bc5               | lea                 ecx, [esp + 0xa0]
            //   488bd6               | inc                 ebp
            //   488bcb               | xor                 eax, eax
            //   e8????????           |                     

    condition:
        7 of them and filesize < 606208
}