rule win_tropidoor_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.tropidoor."
        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.tropidoor"
        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 = { ff5210 85ff 7930 448bc7 488d151f9d0900 488d8db0010000 ff15???????? }
            // n = 7, score = 100
            //   ff5210               | inc                 ecx
            //   85ff                 | mov                 eax, 0x208
            //   7930                 | mov                 eax, dword ptr [esp + 0x60]
            //   448bc7               | dec                 esp
            //   488d151f9d0900       | lea                 eax, [ebp + 0x3b0]
            //   488d8db0010000       | dec                 eax
            //   ff15????????         |                     

        $sequence_1 = { c3 b001 ebe7 4c8b02 4c8d1dde7af8ff 4c8bd1 4c8bca }
            // n = 7, score = 100
            //   c3                   | nop                 dword ptr [eax + eax]
            //   b001                 | mov                 dword ptr [ebp - 0x5c], 0x3fff
            //   ebe7                 | dec                 esp
            //   4c8b02               | lea                 ecx, [ebp - 0x5c]
            //   4c8d1dde7af8ff       | inc                 cx
            //   4c8bd1               | mov                 dword ptr [edi], ecx
            //   4c8bca               | dec                 ebp

        $sequence_2 = { 41c1ea02 416bca07 443bc9 0f8527010000 b8abaaaaaa 41f7e2 c1ea04 }
            // n = 7, score = 100
            //   41c1ea02             | dec                 eax
            //   416bca07             | lea                 edx, [0x9492c]
            //   443bc9               | dec                 eax
            //   0f8527010000         | mov                 dword ptr [esp + 0x20], eax
            //   b8abaaaaaa           | test                eax, eax
            //   41f7e2               | jne                 0x188a
            //   c1ea04               | mov                 eax, dword ptr [ebp - 0x6c]

        $sequence_3 = { 48c744242010000000 4c8d4d00 ba10000000 488d4db8 e8???????? 488d4510 48837d2810 }
            // n = 7, score = 100
            //   48c744242010000000     | dec    ebp
            //   4c8d4d00             | lea                 edi, [esi + 0x10]
            //   ba10000000           | dec                 ecx
            //   488d4db8             | and                 dword ptr [edi], 0
            //   e8????????           |                     
            //   488d4510             | je                  0x1d95
            //   48837d2810           | inc                 esp

        $sequence_4 = { ff5010 ff15???????? b802000000 e9???????? 4c897558 488b4d50 488b01 }
            // n = 7, score = 100
            //   ff5010               | mov                 ecx, dword ptr [eax + 0x18]
            //   ff15????????         |                     
            //   b802000000           | test                cl, 0x7f
            //   e9????????           |                     
            //   4c897558             | je                  0x149d
            //   488b4d50             | inc                 ecx
            //   488b01               | mov                 eax, 8

        $sequence_5 = { c745141ca61aa6 c7451807a604a6 c7451c52a648a6 c7452005a609a6 c7452410a645a6 c7452809a60fa6 c7452c0da655a6 }
            // n = 7, score = 100
            //   c745141ca61aa6       | inc                 ecx
            //   c7451807a604a6       | mov                 esi, dword ptr [esp + edx*4 + 0xb5420]
            //   c7451c52a648a6       | inc                 ecx
            //   c7452005a609a6       | xor                 esi, dword ptr [esp + ecx*4 + 0xb4820]
            //   c7452410a645a6       | mov                 eax, ebp
            //   c7452809a60fa6       | movzx               edx, cl
            //   c7452c0da655a6       | inc                 ecx

        $sequence_6 = { 668945e4 8bc1 663305???????? 668945e6 8bc1 663305???????? 668945e8 }
            // n = 7, score = 100
            //   668945e4             | dec                 eax
            //   8bc1                 | lea                 eax, [ebp + 0x180]
            //   663305????????       |                     
            //   668945e6             | xor                 edx, edx
            //   8bc1                 | mov                 dword ptr [esp + 0x28], 0x104
            //   663305????????       |                     
            //   668945e8             | dec                 esp

        $sequence_7 = { 83f806 7713 488d1548dafdff 8b8c82c0280200 4803ca ffe1 4183fc01 }
            // n = 7, score = 100
            //   83f806               | mov                 dword ptr [esp + 0x20], edi
            //   7713                 | dec                 esp
            //   488d1548dafdff       | lea                 ecx, [esp + 0x48]
            //   8b8c82c0280200       | dec                 eax
            //   4803ca               | mov                 edx, edi
            //   ffe1                 | dec                 eax
            //   4183fc01             | lea                 ecx, [esp + 0x58]

        $sequence_8 = { 488b4f20 ffd6 85c0 0f844a100000 b90da30000 c74424600da34ca3 c74424646ea36ea3 }
            // n = 7, score = 100
            //   488b4f20             | dec                 eax
            //   ffd6                 | mov                 edi, dword ptr [esp + 0x58]
            //   85c0                 | dec                 eax
            //   0f844a100000         | mov                 ebp, dword ptr [esp + 0x50]
            //   b90da30000           | dec                 eax
            //   c74424600da34ca3     | add                 esp, 0x30
            //   c74424646ea36ea3     | inc                 ecx

        $sequence_9 = { 4d8d4001 6685c9 75ed 4c8d85d0090000 498bd7 4d2bc7 0fb70a }
            // n = 7, score = 100
            //   4d8d4001             | inc                 sp
            //   6685c9               | mov                 dword ptr [esp + 0x62], eax
            //   75ed                 | mov                 edx, eax
            //   4c8d85d0090000       | mov                 dword ptr [ebp + 0x168], eax
            //   498bd7               | mov                 ebx, 2
            //   4d2bc7               | dec                 eax
            //   0fb70a               | lea                 edi, [esp + 0x70]

    condition:
        7 of them and filesize < 1826816
}