rule win_gaudox_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.gaudox."
        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.gaudox"
        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 = { 5e 5b 8be5 5d c3 ff75e0 8d45e8 }
            // n = 7, score = 200
            //   5e                   | pop                 esi
            //   5b                   | pop                 ebx
            //   8be5                 | mov                 esp, ebp
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   ff75e0               | push                dword ptr [ebp - 0x20]
            //   8d45e8               | lea                 eax, [ebp - 0x18]

        $sequence_1 = { 5f 33c0 5e 5d c20800 6a00 ff36 }
            // n = 7, score = 200
            //   5f                   | pop                 edi
            //   33c0                 | xor                 eax, eax
            //   5e                   | pop                 esi
            //   5d                   | pop                 ebp
            //   c20800               | ret                 8
            //   6a00                 | push                0
            //   ff36                 | push                dword ptr [esi]

        $sequence_2 = { e8???????? 8b55fc 8bc8 8b45f4 890c82 }
            // n = 5, score = 200
            //   e8????????           |                     
            //   8b55fc               | mov                 edx, dword ptr [ebp - 4]
            //   8bc8                 | mov                 ecx, eax
            //   8b45f4               | mov                 eax, dword ptr [ebp - 0xc]
            //   890c82               | mov                 dword ptr [edx + eax*4], ecx

        $sequence_3 = { 6a0d 6a01 e8???????? 8ac3 5f 5e 5b }
            // n = 7, score = 200
            //   6a0d                 | push                0xd
            //   6a01                 | push                1
            //   e8????????           |                     
            //   8ac3                 | mov                 al, bl
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   5b                   | pop                 ebx

        $sequence_4 = { a1???????? 8bca c1e902 f3a5 8bca 89442418 8b442410 }
            // n = 7, score = 200
            //   a1????????           |                     
            //   8bca                 | mov                 ecx, edx
            //   c1e902               | shr                 ecx, 2
            //   f3a5                 | rep movsd           dword ptr es:[edi], dword ptr [esi]
            //   8bca                 | mov                 ecx, edx
            //   89442418             | mov                 dword ptr [esp + 0x18], eax
            //   8b442410             | mov                 eax, dword ptr [esp + 0x10]

        $sequence_5 = { 3b3d???????? 750f ff750c 8b5508 8bcb e8???????? eb19 }
            // n = 7, score = 200
            //   3b3d????????         |                     
            //   750f                 | jne                 0x11
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   8b5508               | mov                 edx, dword ptr [ebp + 8]
            //   8bcb                 | mov                 ecx, ebx
            //   e8????????           |                     
            //   eb19                 | jmp                 0x1b

        $sequence_6 = { 6a25 6a01 e8???????? 8945f8 85c0 0f84dd000000 }
            // n = 6, score = 200
            //   6a25                 | push                0x25
            //   6a01                 | push                1
            //   e8????????           |                     
            //   8945f8               | mov                 dword ptr [ebp - 8], eax
            //   85c0                 | test                eax, eax
            //   0f84dd000000         | je                  0xe3

        $sequence_7 = { 8b01 6a00 6a00 6a00 57 51 ff500c }
            // n = 7, score = 200
            //   8b01                 | mov                 eax, dword ptr [ecx]
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   57                   | push                edi
            //   51                   | push                ecx
            //   ff500c               | call                dword ptr [eax + 0xc]

        $sequence_8 = { 894c240c 8b01 33d2 89442414 }
            // n = 4, score = 200
            //   894c240c             | mov                 dword ptr [esp + 0xc], ecx
            //   8b01                 | mov                 eax, dword ptr [ecx]
            //   33d2                 | xor                 edx, edx
            //   89442414             | mov                 dword ptr [esp + 0x14], eax

        $sequence_9 = { ba67d6120b 85ff 7420 8da42400000000 0fb60c1e 8bc2 }
            // n = 6, score = 200
            //   ba67d6120b           | mov                 edx, 0xb12d667
            //   85ff                 | test                edi, edi
            //   7420                 | je                  0x22
            //   8da42400000000       | lea                 esp, [esp]
            //   0fb60c1e             | movzx               ecx, byte ptr [esi + ebx]
            //   8bc2                 | mov                 eax, edx

    condition:
        7 of them and filesize < 155648
}