rule win_tclient_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.tclient."
        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.tclient"
        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 = { 0345e0 0345f8 894304 8b45e0 c1c010 03c6 c1c210 }
            // n = 7, score = 100
            //   0345e0               | add                 eax, dword ptr [ebp - 0x20]
            //   0345f8               | add                 eax, dword ptr [ebp - 8]
            //   894304               | mov                 dword ptr [ebx + 4], eax
            //   8b45e0               | mov                 eax, dword ptr [ebp - 0x20]
            //   c1c010               | rol                 eax, 0x10
            //   03c6                 | add                 eax, esi
            //   c1c210               | rol                 edx, 0x10

        $sequence_1 = { 8d442410 56 57 8bf2 89442410 8bd1 8d7c2418 }
            // n = 7, score = 100
            //   8d442410             | lea                 eax, [esp + 0x10]
            //   56                   | push                esi
            //   57                   | push                edi
            //   8bf2                 | mov                 esi, edx
            //   89442410             | mov                 dword ptr [esp + 0x10], eax
            //   8bd1                 | mov                 edx, ecx
            //   8d7c2418             | lea                 edi, [esp + 0x18]

        $sequence_2 = { 8b4d08 e8???????? 8b5624 51 8b4d08 e8???????? 59 }
            // n = 7, score = 100
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   e8????????           |                     
            //   8b5624               | mov                 edx, dword ptr [esi + 0x24]
            //   51                   | push                ecx
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   e8????????           |                     
            //   59                   | pop                 ecx

        $sequence_3 = { ffb508ffffff 33f0 33fa ffb518ffffff e8???????? 8b8d2cffffff 33f0 }
            // n = 7, score = 100
            //   ffb508ffffff         | push                dword ptr [ebp - 0xf8]
            //   33f0                 | xor                 esi, eax
            //   33fa                 | xor                 edi, edx
            //   ffb518ffffff         | push                dword ptr [ebp - 0xe8]
            //   e8????????           |                     
            //   8b8d2cffffff         | mov                 ecx, dword ptr [ebp - 0xd4]
            //   33f0                 | xor                 esi, eax

        $sequence_4 = { 85c0 7554 8b4e0c 81c12c020000 74c5 8b4624 89416c }
            // n = 7, score = 100
            //   85c0                 | test                eax, eax
            //   7554                 | jne                 0x56
            //   8b4e0c               | mov                 ecx, dword ptr [esi + 0xc]
            //   81c12c020000         | add                 ecx, 0x22c
            //   74c5                 | je                  0xffffffc7
            //   8b4624               | mov                 eax, dword ptr [esi + 0x24]
            //   89416c               | mov                 dword ptr [ecx + 0x6c], eax

        $sequence_5 = { 7f3e 018eac000000 2bc1 8986a8000000 39bea8000000 779e 80beb400000000 }
            // n = 7, score = 100
            //   7f3e                 | jg                  0x40
            //   018eac000000         | add                 dword ptr [esi + 0xac], ecx
            //   2bc1                 | sub                 eax, ecx
            //   8986a8000000         | mov                 dword ptr [esi + 0xa8], eax
            //   39bea8000000         | cmp                 dword ptr [esi + 0xa8], edi
            //   779e                 | ja                  0xffffffa0
            //   80beb400000000       | cmp                 byte ptr [esi + 0xb4], 0

        $sequence_6 = { 7408 83ceff e9???????? 80bb260300000a 7317 6a0a 6a02 }
            // n = 7, score = 100
            //   7408                 | je                  0xa
            //   83ceff               | or                  esi, 0xffffffff
            //   e9????????           |                     
            //   80bb260300000a       | cmp                 byte ptr [ebx + 0x326], 0xa
            //   7317                 | jae                 0x19
            //   6a0a                 | push                0xa
            //   6a02                 | push                2

        $sequence_7 = { 899530ffffff 03c2 898d04ffffff 898534ffffff 898558ffffff 8b8514ffffff 13c1 }
            // n = 7, score = 100
            //   899530ffffff         | mov                 dword ptr [ebp - 0xd0], edx
            //   03c2                 | add                 eax, edx
            //   898d04ffffff         | mov                 dword ptr [ebp - 0xfc], ecx
            //   898534ffffff         | mov                 dword ptr [ebp - 0xcc], eax
            //   898558ffffff         | mov                 dword ptr [ebp - 0xa8], eax
            //   8b8514ffffff         | mov                 eax, dword ptr [ebp - 0xec]
            //   13c1                 | adc                 eax, ecx

        $sequence_8 = { 8bf0 85f6 7528 8b55ec 8d4b20 8d5220 e8???????? }
            // n = 7, score = 100
            //   8bf0                 | mov                 esi, eax
            //   85f6                 | test                esi, esi
            //   7528                 | jne                 0x2a
            //   8b55ec               | mov                 edx, dword ptr [ebp - 0x14]
            //   8d4b20               | lea                 ecx, [ebx + 0x20]
            //   8d5220               | lea                 edx, [edx + 0x20]
            //   e8????????           |                     

        $sequence_9 = { 8b7148 e8???????? 8bce 85f6 75f2 8324bb00 47 }
            // n = 7, score = 100
            //   8b7148               | mov                 esi, dword ptr [ecx + 0x48]
            //   e8????????           |                     
            //   8bce                 | mov                 ecx, esi
            //   85f6                 | test                esi, esi
            //   75f2                 | jne                 0xfffffff4
            //   8324bb00             | and                 dword ptr [ebx + edi*4], 0
            //   47                   | inc                 edi

    condition:
        7 of them and filesize < 1063936
}