rule win_rokku_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.rokku."
        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.rokku"
        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 = { 33c0 40 c3 8b442404 8b4c2408 c744880c02000000 33c0 }
            // n = 7, score = 200
            //   33c0                 | xor                 eax, eax
            //   40                   | inc                 eax
            //   c3                   | ret                 
            //   8b442404             | mov                 eax, dword ptr [esp + 4]
            //   8b4c2408             | mov                 ecx, dword ptr [esp + 8]
            //   c744880c02000000     | mov                 dword ptr [eax + ecx*4 + 0xc], 2
            //   33c0                 | xor                 eax, eax

        $sequence_1 = { 8bc1 11542410 f76c2438 01442414 8b44246c 11542410 f76c2440 }
            // n = 7, score = 200
            //   8bc1                 | mov                 eax, ecx
            //   11542410             | adc                 dword ptr [esp + 0x10], edx
            //   f76c2438             | imul                dword ptr [esp + 0x38]
            //   01442414             | add                 dword ptr [esp + 0x14], eax
            //   8b44246c             | mov                 eax, dword ptr [esp + 0x6c]
            //   11542410             | adc                 dword ptr [esp + 0x10], edx
            //   f76c2440             | imul                dword ptr [esp + 0x40]

        $sequence_2 = { 33c0 40 c3 8b442404 8b4c2408 c744880403000000 33c0 }
            // n = 7, score = 200
            //   33c0                 | xor                 eax, eax
            //   40                   | inc                 eax
            //   c3                   | ret                 
            //   8b442404             | mov                 eax, dword ptr [esp + 4]
            //   8b4c2408             | mov                 ecx, dword ptr [esp + 8]
            //   c744880403000000     | mov                 dword ptr [eax + ecx*4 + 4], 3
            //   33c0                 | xor                 eax, eax

        $sequence_3 = { 8b0d???????? 88542439 8d542422 e8???????? }
            // n = 4, score = 200
            //   8b0d????????         |                     
            //   88542439             | mov                 byte ptr [esp + 0x39], dl
            //   8d542422             | lea                 edx, [esp + 0x22]
            //   e8????????           |                     

        $sequence_4 = { 889dd8fdffff 0f2805???????? 0f11855cfdffff 0f2805???????? 0f11856cfdffff 0f2805???????? 0f11857cfdffff }
            // n = 7, score = 200
            //   889dd8fdffff         | mov                 byte ptr [ebp - 0x228], bl
            //   0f2805????????       |                     
            //   0f11855cfdffff       | movups              xmmword ptr [ebp - 0x2a4], xmm0
            //   0f2805????????       |                     
            //   0f11856cfdffff       | movups              xmmword ptr [ebp - 0x294], xmm0
            //   0f2805????????       |                     
            //   0f11857cfdffff       | movups              xmmword ptr [ebp - 0x284], xmm0

        $sequence_5 = { 03f8 13ca 8b542444 8d0412 f76c2464 03f8 }
            // n = 6, score = 200
            //   03f8                 | add                 edi, eax
            //   13ca                 | adc                 ecx, edx
            //   8b542444             | mov                 edx, dword ptr [esp + 0x44]
            //   8d0412               | lea                 eax, [edx + edx]
            //   f76c2464             | imul                dword ptr [esp + 0x64]
            //   03f8                 | add                 edi, eax

        $sequence_6 = { 0f2805???????? 0f1185fcfcffff c645fd12 0f2805???????? 0f11850cfdffff 885dff 0f2805???????? }
            // n = 7, score = 200
            //   0f2805????????       |                     
            //   0f1185fcfcffff       | movups              xmmword ptr [ebp - 0x304], xmm0
            //   c645fd12             | mov                 byte ptr [ebp - 3], 0x12
            //   0f2805????????       |                     
            //   0f11850cfdffff       | movups              xmmword ptr [ebp - 0x2f4], xmm0
            //   885dff               | mov                 byte ptr [ebp - 1], bl
            //   0f2805????????       |                     

        $sequence_7 = { 894218 8b442430 894208 8b442424 894228 8b442420 89421c }
            // n = 7, score = 200
            //   894218               | mov                 dword ptr [edx + 0x18], eax
            //   8b442430             | mov                 eax, dword ptr [esp + 0x30]
            //   894208               | mov                 dword ptr [edx + 8], eax
            //   8b442424             | mov                 eax, dword ptr [esp + 0x24]
            //   894228               | mov                 dword ptr [edx + 0x28], eax
            //   8b442420             | mov                 eax, dword ptr [esp + 0x20]
            //   89421c               | mov                 dword ptr [edx + 0x1c], eax

        $sequence_8 = { 8bfa 85db 7504 33c0 eb24 }
            // n = 5, score = 200
            //   8bfa                 | mov                 edi, edx
            //   85db                 | test                ebx, ebx
            //   7504                 | jne                 6
            //   33c0                 | xor                 eax, eax
            //   eb24                 | jmp                 0x26

        $sequence_9 = { 51 6a00 6a00 8bf2 }
            // n = 4, score = 200
            //   51                   | push                ecx
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   8bf2                 | mov                 esi, edx

    condition:
        7 of them and filesize < 548864
}