rule win_goldbackdoor_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.goldbackdoor."
        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.goldbackdoor"
        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 = { c3 33c0 55 53 89442428 e8???????? 8bf8 }
            // n = 7, score = 100
            //   c3                   | ret                 
            //   33c0                 | xor                 eax, eax
            //   55                   | push                ebp
            //   53                   | push                ebx
            //   89442428             | mov                 dword ptr [esp + 0x28], eax
            //   e8????????           |                     
            //   8bf8                 | mov                 edi, eax

        $sequence_1 = { ff742430 ff742430 55 e8???????? 83c404 50 e8???????? }
            // n = 7, score = 100
            //   ff742430             | push                dword ptr [esp + 0x30]
            //   ff742430             | push                dword ptr [esp + 0x30]
            //   55                   | push                ebp
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_2 = { 50 e8???????? 8d45d4 6a04 50 e8???????? c7471000000000 }
            // n = 7, score = 100
            //   50                   | push                eax
            //   e8????????           |                     
            //   8d45d4               | lea                 eax, [ebp - 0x2c]
            //   6a04                 | push                4
            //   50                   | push                eax
            //   e8????????           |                     
            //   c7471000000000       | mov                 dword ptr [edi + 0x10], 0

        $sequence_3 = { ff7620 ff742418 e8???????? 83c40c 85c0 0f846cffffff e8???????? }
            // n = 7, score = 100
            //   ff7620               | push                dword ptr [esi + 0x20]
            //   ff742418             | push                dword ptr [esp + 0x18]
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   85c0                 | test                eax, eax
            //   0f846cffffff         | je                  0xffffff72
            //   e8????????           |                     

        $sequence_4 = { e8???????? 8bd0 b954555515 8b4304 2bc8 83f901 730a }
            // n = 7, score = 100
            //   e8????????           |                     
            //   8bd0                 | mov                 edx, eax
            //   b954555515           | mov                 ecx, 0x15555554
            //   8b4304               | mov                 eax, dword ptr [ebx + 4]
            //   2bc8                 | sub                 ecx, eax
            //   83f901               | cmp                 ecx, 1
            //   730a                 | jae                 0xc

        $sequence_5 = { 55 e8???????? 83c408 85c0 0f8462020000 834d1004 55 }
            // n = 7, score = 100
            //   55                   | push                ebp
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   85c0                 | test                eax, eax
            //   0f8462020000         | je                  0x268
            //   834d1004             | or                  dword ptr [ebp + 0x10], 4
            //   55                   | push                ebp

        $sequence_6 = { 83c404 c78538ffffff00000000 8d459c 50 8d8d48ffffff e8???????? }
            // n = 6, score = 100
            //   83c404               | add                 esp, 4
            //   c78538ffffff00000000     | mov    dword ptr [ebp - 0xc8], 0
            //   8d459c               | lea                 eax, [ebp - 0x64]
            //   50                   | push                eax
            //   8d8d48ffffff         | lea                 ecx, [ebp - 0xb8]
            //   e8????????           |                     

        $sequence_7 = { c745fc00000000 8b8540ffffff 85c0 7413 50 e8???????? 83c404 }
            // n = 7, score = 100
            //   c745fc00000000       | mov                 dword ptr [ebp - 4], 0
            //   8b8540ffffff         | mov                 eax, dword ptr [ebp - 0xc0]
            //   85c0                 | test                eax, eax
            //   7413                 | je                  0x15
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c404               | add                 esp, 4

        $sequence_8 = { e8???????? ff7594 e8???????? 83c408 8bf0 85f6 7529 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   ff7594               | push                dword ptr [ebp - 0x6c]
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   8bf0                 | mov                 esi, eax
            //   85f6                 | test                esi, esi
            //   7529                 | jne                 0x2b

        $sequence_9 = { 51 e8???????? 85c0 8b4508 740a 8b00 894508 }
            // n = 7, score = 100
            //   51                   | push                ecx
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   740a                 | je                  0xc
            //   8b00                 | mov                 eax, dword ptr [eax]
            //   894508               | mov                 dword ptr [ebp + 8], eax

    condition:
        7 of them and filesize < 2455552
}