rule win_taidoor_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.taidoor."
        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.taidoor"
        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 = { 7cf5 c745fcfcffffff 33ff 33db }
            // n = 4, score = 300
            //   7cf5                 | jl                  0xfffffff7
            //   c745fcfcffffff       | mov                 dword ptr [ebp - 4], 0xfffffffc
            //   33ff                 | xor                 edi, edi
            //   33db                 | xor                 ebx, ebx

        $sequence_1 = { 8b1d???????? 8d45e0 57 50 8d45e4 897de4 }
            // n = 6, score = 300
            //   8b1d????????         |                     
            //   8d45e0               | lea                 eax, [ebp - 0x20]
            //   57                   | push                edi
            //   50                   | push                eax
            //   8d45e4               | lea                 eax, [ebp - 0x1c]
            //   897de4               | mov                 dword ptr [ebp - 0x1c], edi

        $sequence_2 = { 8bd8 3bdf 895de8 7508 }
            // n = 4, score = 300
            //   8bd8                 | mov                 ebx, eax
            //   3bdf                 | cmp                 ebx, edi
            //   895de8               | mov                 dword ptr [ebp - 0x18], ebx
            //   7508                 | jne                 0xa

        $sequence_3 = { 7e24 8a0406 fec0 3c3a 8845ec }
            // n = 5, score = 300
            //   7e24                 | jle                 0x26
            //   8a0406               | mov                 al, byte ptr [esi + eax]
            //   fec0                 | inc                 al
            //   3c3a                 | cmp                 al, 0x3a
            //   8845ec               | mov                 byte ptr [ebp - 0x14], al

        $sequence_4 = { 0fbe01 48 48 0f8472030000 48 0f8447030000 }
            // n = 6, score = 300
            //   0fbe01               | movsx               eax, byte ptr [ecx]
            //   48                   | dec                 eax
            //   48                   | dec                 eax
            //   0f8472030000         | je                  0x378
            //   48                   | dec                 eax
            //   0f8447030000         | je                  0x34d

        $sequence_5 = { 66ab aa 895dfc ffd6 40 85c0 7e29 }
            // n = 7, score = 300
            //   66ab                 | stosw               word ptr es:[edi], ax
            //   aa                   | stosb               byte ptr es:[edi], al
            //   895dfc               | mov                 dword ptr [ebp - 4], ebx
            //   ffd6                 | call                esi
            //   40                   | inc                 eax
            //   85c0                 | test                eax, eax
            //   7e29                 | jle                 0x2b

        $sequence_6 = { 50 ff7508 56 57 ff15???????? 8b45ec 8d4df0 }
            // n = 7, score = 300
            //   50                   | push                eax
            //   ff7508               | push                dword ptr [ebp + 8]
            //   56                   | push                esi
            //   57                   | push                edi
            //   ff15????????         |                     
            //   8b45ec               | mov                 eax, dword ptr [ebp - 0x14]
            //   8d4df0               | lea                 ecx, [ebp - 0x10]

        $sequence_7 = { b940420f00 f7f9 8d45e0 52 ff35???????? ff35???????? }
            // n = 6, score = 300
            //   b940420f00           | mov                 ecx, 0xf4240
            //   f7f9                 | idiv                ecx
            //   8d45e0               | lea                 eax, [ebp - 0x20]
            //   52                   | push                edx
            //   ff35????????         |                     
            //   ff35????????         |                     

        $sequence_8 = { e9???????? 8d4de0 e8???????? 8d8588f7ffff 50 ff35???????? ffd6 }
            // n = 7, score = 300
            //   e9????????           |                     
            //   8d4de0               | lea                 ecx, [ebp - 0x20]
            //   e8????????           |                     
            //   8d8588f7ffff         | lea                 eax, [ebp - 0x878]
            //   50                   | push                eax
            //   ff35????????         |                     
            //   ffd6                 | call                esi

        $sequence_9 = { 53 6a02 8d85f4feffff 68000000c0 }
            // n = 4, score = 300
            //   53                   | push                ebx
            //   6a02                 | push                2
            //   8d85f4feffff         | lea                 eax, [ebp - 0x10c]
            //   68000000c0           | push                0xc0000000

    condition:
        7 of them and filesize < 49152
}