rule win_gaudox_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        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 = "20260422"
        malpedia_hash = "a182e35da64e6d71cb55f125c4d4225196523f14"
        malpedia_version = "20260504"
        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 = { 897dfc 46 3b75f8 76c7 5e 5b 33c0 }
            // n = 7, score = 200
            //   897dfc               | mov                 dword ptr [ebp - 4], edi
            //   46                   | inc                 esi
            //   3b75f8               | cmp                 esi, dword ptr [ebp - 8]
            //   76c7                 | jbe                 0xffffffc9
            //   5e                   | pop                 esi
            //   5b                   | pop                 ebx
            //   33c0                 | xor                 eax, eax

        $sequence_1 = { 6a08 6a00 e8???????? 5f 8bc6 }
            // n = 5, score = 200
            //   6a08                 | push                8
            //   6a00                 | push                0
            //   e8????????           |                     
            //   5f                   | pop                 edi
            //   8bc6                 | mov                 eax, esi

        $sequence_2 = { 6a00 53 52 51 e8???????? 8bc8 46 }
            // n = 7, score = 200
            //   6a00                 | push                0
            //   53                   | push                ebx
            //   52                   | push                edx
            //   51                   | push                ecx
            //   e8????????           |                     
            //   8bc8                 | mov                 ecx, eax
            //   46                   | inc                 esi

        $sequence_3 = { 6a00 8d45dc c745c418000000 8945cc 8d45e4 50 8d45c4 }
            // n = 7, score = 200
            //   6a00                 | push                0
            //   8d45dc               | lea                 eax, [ebp - 0x24]
            //   c745c418000000       | mov                 dword ptr [ebp - 0x3c], 0x18
            //   8945cc               | mov                 dword ptr [ebp - 0x34], eax
            //   8d45e4               | lea                 eax, [ebp - 0x1c]
            //   50                   | push                eax
            //   8d45c4               | lea                 eax, [ebp - 0x3c]

        $sequence_4 = { 8b400c 83c00c 89442424 8b18 85db 0f84db000000 b90a020000 }
            // n = 7, score = 200
            //   8b400c               | mov                 eax, dword ptr [eax + 0xc]
            //   83c00c               | add                 eax, 0xc
            //   89442424             | mov                 dword ptr [esp + 0x24], eax
            //   8b18                 | mov                 ebx, dword ptr [eax]
            //   85db                 | test                ebx, ebx
            //   0f84db000000         | je                  0xe1
            //   b90a020000           | mov                 ecx, 0x20a

        $sequence_5 = { 50 8d442414 50 6a00 6a00 6a32 6a00 }
            // n = 7, score = 200
            //   50                   | push                eax
            //   8d442414             | lea                 eax, [esp + 0x14]
            //   50                   | push                eax
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   6a32                 | push                0x32
            //   6a00                 | push                0

        $sequence_6 = { 8b4508 33ce 897804 5f 8908 8b4dfc 5e }
            // n = 7, score = 200
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   33ce                 | xor                 ecx, esi
            //   897804               | mov                 dword ptr [eax + 4], edi
            //   5f                   | pop                 edi
            //   8908                 | mov                 dword ptr [eax], ecx
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]
            //   5e                   | pop                 esi

        $sequence_7 = { 6a00 6a00 6a32 6a00 e8???????? 85c0 0f8859020000 }
            // n = 7, score = 200
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   6a32                 | push                0x32
            //   6a00                 | push                0
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   0f8859020000         | js                  0x25f

        $sequence_8 = { 8d0c36 8d7804 8908 51 8bcf e8???????? 85ff }
            // n = 7, score = 200
            //   8d0c36               | lea                 ecx, [esi + esi]
            //   8d7804               | lea                 edi, [eax + 4]
            //   8908                 | mov                 dword ptr [eax], ecx
            //   51                   | push                ecx
            //   8bcf                 | mov                 ecx, edi
            //   e8????????           |                     
            //   85ff                 | test                edi, edi

        $sequence_9 = { c705????????00000000 e8???????? a3???????? 85c0 0f8466020000 6a50 6a08 }
            // n = 7, score = 200
            //   c705????????00000000     |     
            //   e8????????           |                     
            //   a3????????           |                     
            //   85c0                 | test                eax, eax
            //   0f8466020000         | je                  0x26c
            //   6a50                 | push                0x50
            //   6a08                 | push                8

    condition:
        7 of them and filesize < 155648
}