rule win_goldbackdoor_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        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 = "20230705"
        malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41"
        malpedia_version = "20230715"
        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 = { ff15???????? 6a20 89730c e8???????? 83c404 8945f0 8bc8 }
            // n = 7, score = 100
            //   ff15????????         |                     
            //   6a20                 | push                0x20
            //   89730c               | mov                 dword ptr [ebx + 0xc], esi
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   8945f0               | mov                 dword ptr [ebp - 0x10], eax
            //   8bc8                 | mov                 ecx, eax

        $sequence_1 = { ff7608 ff15???????? 8b45ec 6aff ff7008 ff15???????? 8b45ec }
            // n = 7, score = 100
            //   ff7608               | push                dword ptr [esi + 8]
            //   ff15????????         |                     
            //   8b45ec               | mov                 eax, dword ptr [ebp - 0x14]
            //   6aff                 | push                -1
            //   ff7008               | push                dword ptr [eax + 8]
            //   ff15????????         |                     
            //   8b45ec               | mov                 eax, dword ptr [ebp - 0x14]

        $sequence_2 = { 6812010000 68???????? 6a6b 6a79 6a0a e8???????? }
            // n = 6, score = 100
            //   6812010000           | push                0x112
            //   68????????           |                     
            //   6a6b                 | push                0x6b
            //   6a79                 | push                0x79
            //   6a0a                 | push                0xa
            //   e8????????           |                     

        $sequence_3 = { ff15???????? 8d5508 8d4de0 e8???????? b9???????? 8bf0 e8???????? }
            // n = 7, score = 100
            //   ff15????????         |                     
            //   8d5508               | lea                 edx, [ebp + 8]
            //   8d4de0               | lea                 ecx, [ebp - 0x20]
            //   e8????????           |                     
            //   b9????????           |                     
            //   8bf0                 | mov                 esi, eax
            //   e8????????           |                     

        $sequence_4 = { ff7614 e8???????? 83c404 83f840 7e07 68b1000000 ebbc }
            // n = 7, score = 100
            //   ff7614               | push                dword ptr [esi + 0x14]
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   83f840               | cmp                 eax, 0x40
            //   7e07                 | jle                 9
            //   68b1000000           | push                0xb1
            //   ebbc                 | jmp                 0xffffffbe

        $sequence_5 = { ff7504 46 e8???????? 83c404 3bf0 7c9b 8b5c2418 }
            // n = 7, score = 100
            //   ff7504               | push                dword ptr [ebp + 4]
            //   46                   | inc                 esi
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   3bf0                 | cmp                 esi, eax
            //   7c9b                 | jl                  0xffffff9d
            //   8b5c2418             | mov                 ebx, dword ptr [esp + 0x18]

        $sequence_6 = { ff761c e8???????? 83c408 85c0 74d4 e8???????? 50 }
            // n = 7, score = 100
            //   ff761c               | push                dword ptr [esi + 0x1c]
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   85c0                 | test                eax, eax
            //   74d4                 | je                  0xffffffd6
            //   e8????????           |                     
            //   50                   | push                eax

        $sequence_7 = { ff742430 56 e8???????? 83c418 85c0 7417 8d442408 }
            // n = 7, score = 100
            //   ff742430             | push                dword ptr [esp + 0x30]
            //   56                   | push                esi
            //   e8????????           |                     
            //   83c418               | add                 esp, 0x18
            //   85c0                 | test                eax, eax
            //   7417                 | je                  0x19
            //   8d442408             | lea                 eax, [esp + 8]

        $sequence_8 = { 0f8907ffffff 56 57 53 ff74244c e8???????? 33c9 }
            // n = 7, score = 100
            //   0f8907ffffff         | jns                 0xffffff0d
            //   56                   | push                esi
            //   57                   | push                edi
            //   53                   | push                ebx
            //   ff74244c             | push                dword ptr [esp + 0x4c]
            //   e8????????           |                     
            //   33c9                 | xor                 ecx, ecx

        $sequence_9 = { 83f810 0f82e3020000 40 8d8d60ffffff 50 ffb560ffffff e9???????? }
            // n = 7, score = 100
            //   83f810               | cmp                 eax, 0x10
            //   0f82e3020000         | jb                  0x2e9
            //   40                   | inc                 eax
            //   8d8d60ffffff         | lea                 ecx, [ebp - 0xa0]
            //   50                   | push                eax
            //   ffb560ffffff         | push                dword ptr [ebp - 0xa0]
            //   e9????????           |                     

    condition:
        7 of them and filesize < 2455552
}