rule win_rustonotto_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.rustonotto."
        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.rustonotto"
        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 = { 74f5 4c0fafd8 83fa01 75ec 4d85db 7512 488d0d10ec0d00 }
            // n = 7, score = 100
            //   74f5                 | mov                 eax, dword ptr [esp + 0x70]
            //   4c0fafd8             | dec                 eax
            //   83fa01               | mov                 edx, dword ptr [eax + 8]
            //   75ec                 | dec                 esp
            //   4d85db               | mov                 esi, dword ptr [eax + 0x10]
            //   7512                 | dec                 eax
            //   488d0d10ec0d00       | mov                 ecx, dword ptr [edi + 8]

        $sequence_1 = { e8???????? 84c0 0f84aa000000 488b0d???????? 488b4138 4885c0 0f84e8000000 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   84c0                 | mov                 eax, dword ptr [esi + 0x14]
            //   0f84aa000000         | mov                 dword ptr [esp + 0x34], eax
            //   488b0d????????       |                     
            //   488b4138             | dec                 eax
            //   4885c0               | mov                 dword ptr [esp + 0x20], edi
            //   0f84e8000000         | dec                 eax

        $sequence_2 = { e8???????? c6850708000000 c6850608000000 0f28742440 0f287c2430 4883c458 5b }
            // n = 7, score = 100
            //   e8????????           |                     
            //   c6850708000000       | mov                 byte ptr [ebp + 0x86d], 0
            //   c6850608000000       | mov                 byte ptr [ebp + 0x86c], 1
            //   0f28742440           | mov                 eax, dword ptr [ebp + 0x528]
            //   0f287c2430           | mov                 byte ptr [ebp + 0x576], al
            //   4883c458             | and                 bl, 1
            //   5b                   | mov                 byte ptr [ebp + 0x575], bl

        $sequence_3 = { 488d9530080000 e8???????? 4c8b8508180000 e9???????? 85c0 0f84fefdffff 488b0d???????? }
            // n = 7, score = 100
            //   488d9530080000       | mov                 dword ptr [ebp + 0x1be0], 0
            //   e8????????           |                     
            //   4c8b8508180000       | dec                 eax
            //   e9????????           |                     
            //   85c0                 | mov                 dword ptr [ebp + 0x1b70], 0
            //   0f84fefdffff         | dec                 eax
            //   488b0d????????       |                     

        $sequence_4 = { 48c1e204 41b808000000 e8???????? 488b86f0000000 48ffc0 eb02 31c0 }
            // n = 7, score = 100
            //   48c1e204             | mov                 ebx, 3
            //   41b808000000         | dec                 eax
            //   e8????????           |                     
            //   488b86f0000000       | shl                 ecx, 0x20
            //   48ffc0               | inc                 esp
            //   eb02                 | mov                 ebp, dword ptr [ebp + 0x15e1]
            //   31c0                 | dec                 ecx

        $sequence_5 = { b920000000 ba08000000 e8???????? 4885c0 0f84f1370000 488985e8170000 498b06 }
            // n = 7, score = 100
            //   b920000000           | mov                 edx, 1
            //   ba08000000           | dec                 eax
            //   e8????????           |                     
            //   4885c0               | test                eax, eax
            //   0f84f1370000         | je                  0x4a8
            //   488985e8170000       | dec                 eax
            //   498b06               | mov                 edi, eax

        $sequence_6 = { 85c0 0f847afbffff 488d0dd2931900 e8???????? 89c2 84c0 0f8519feffff }
            // n = 7, score = 100
            //   85c0                 | dec                 eax
            //   0f847afbffff         | lea                 eax, [0x16b1e5]
            //   488d0dd2931900       | dec                 eax
            //   e8????????           |                     
            //   89c2                 | mov                 dword ptr [esp + 0x20], eax
            //   84c0                 | dec                 eax
            //   0f8519feffff         | lea                 ecx, [0x16b9f1]

        $sequence_7 = { 4d39ec 0f8376040000 410fb60424 49ffc4 4c896710 3c0a 0f8569040000 }
            // n = 7, score = 100
            //   4d39ec               | dec                 ebp
            //   0f8376040000         | sub                 eax, edi
            //   410fb60424           | dec                 esp
            //   49ffc4               | mov                 edi, dword ptr [ebp + 0x80]
            //   4c896710             | dec                 edi
            //   3c0a                 | lea                 esp, [eax + edi]
            //   0f8569040000         | dec                 ecx

        $sequence_8 = { c3 0fb64660 4883c428 5f 5e c3 488d0dfbe30f00 }
            // n = 7, score = 100
            //   c3                   | inc                 ecx
            //   0fb64660             | mov                 byte ptr [edi + edi], dl
            //   4883c428             | inc                 ecx
            //   5f                   | and                 ah, 0x3f
            //   5e                   | inc                 ecx
            //   c3                   | or                  ah, 0x80
            //   488d0dfbe30f00       | inc                 ebp

        $sequence_9 = { 807d4600 7432 31c9 b001 488b5538 f00fb00a 7548 }
            // n = 7, score = 100
            //   807d4600             | add                 cl, 0xfa
            //   7432                 | movzx               edx, cl
            //   31c9                 | cmp                 dl, 6
            //   b001                 | mov                 ecx, 6
            //   488b5538             | cmovb               ecx, edx
            //   f00fb00a             | cmp                 byte ptr [eax + 0x68], 3
            //   7548                 | je                  0xf

    condition:
        7 of them and filesize < 5989376
}