rule win_yanluowang_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.yanluowang."
        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.yanluowang"
        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 = { 8974241c 8d3437 89742410 8d3528c04500 8b442420 898740010000 c1c008 }
            // n = 7, score = 100
            //   8974241c             | mov                 dword ptr [esp + 0x1c], esi
            //   8d3437               | lea                 esi, [edi + esi]
            //   89742410             | mov                 dword ptr [esp + 0x10], esi
            //   8d3528c04500         | lea                 esi, [0x45c028]
            //   8b442420             | mov                 eax, dword ptr [esp + 0x20]
            //   898740010000         | mov                 dword ptr [edi + 0x140], eax
            //   c1c008               | rol                 eax, 8

        $sequence_1 = { 8d3cc500000000 c1e607 33f9 33f1 33fa 8bd3 335d14 }
            // n = 7, score = 100
            //   8d3cc500000000       | lea                 edi, [eax*8]
            //   c1e607               | shl                 esi, 7
            //   33f9                 | xor                 edi, ecx
            //   33f1                 | xor                 esi, ecx
            //   33fa                 | xor                 edi, edx
            //   8bd3                 | mov                 edx, ebx
            //   335d14               | xor                 ebx, dword ptr [ebp + 0x14]

        $sequence_2 = { c1e103 81f900100000 0f8219010000 8b76fc 83c123 2bc6 83c0fc }
            // n = 7, score = 100
            //   c1e103               | shl                 ecx, 3
            //   81f900100000         | cmp                 ecx, 0x1000
            //   0f8219010000         | jb                  0x11f
            //   8b76fc               | mov                 esi, dword ptr [esi - 4]
            //   83c123               | add                 ecx, 0x23
            //   2bc6                 | sub                 eax, esi
            //   83c0fc               | add                 eax, -4

        $sequence_3 = { 3355e8 8d4808 85c9 7402 8911 3375c0 8d480c }
            // n = 7, score = 100
            //   3355e8               | xor                 edx, dword ptr [ebp - 0x18]
            //   8d4808               | lea                 ecx, [eax + 8]
            //   85c9                 | test                ecx, ecx
            //   7402                 | je                  4
            //   8911                 | mov                 dword ptr [ecx], edx
            //   3375c0               | xor                 esi, dword ptr [ebp - 0x40]
            //   8d480c               | lea                 ecx, [eax + 0xc]

        $sequence_4 = { c745fc00000000 6800040000 c745ec00000000 e8???????? 83c404 8985e0fcffff 85c0 }
            // n = 7, score = 100
            //   c745fc00000000       | mov                 dword ptr [ebp - 4], 0
            //   6800040000           | push                0x400
            //   c745ec00000000       | mov                 dword ptr [ebp - 0x14], 0
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   8985e0fcffff         | mov                 dword ptr [ebp - 0x320], eax
            //   85c0                 | test                eax, eax

        $sequence_5 = { 8d45f0 8d4df8 50 3916 7410 c745f034a44400 c745f409000000 }
            // n = 7, score = 100
            //   8d45f0               | lea                 eax, [ebp - 0x10]
            //   8d4df8               | lea                 ecx, [ebp - 8]
            //   50                   | push                eax
            //   3916                 | cmp                 dword ptr [esi], edx
            //   7410                 | je                  0x12
            //   c745f034a44400       | mov                 dword ptr [ebp - 0x10], 0x44a434
            //   c745f409000000       | mov                 dword ptr [ebp - 0xc], 9

        $sequence_6 = { 7524 8d85c8f5ffff 84db 7407 }
            // n = 4, score = 100
            //   7524                 | jne                 0x26
            //   8d85c8f5ffff         | lea                 eax, [ebp - 0xa38]
            //   84db                 | test                bl, bl
            //   7407                 | je                  9

        $sequence_7 = { 770f 0fbec1 0fb680a0a84400 83e00f eb02 33c0 6bc809 }
            // n = 7, score = 100
            //   770f                 | ja                  0x11
            //   0fbec1               | movsx               eax, cl
            //   0fb680a0a84400       | movzx               eax, byte ptr [eax + 0x44a8a0]
            //   83e00f               | and                 eax, 0xf
            //   eb02                 | jmp                 4
            //   33c0                 | xor                 eax, eax
            //   6bc809               | imul                ecx, eax, 9

        $sequence_8 = { 8bd7 c1fa06 8bc7 83e03f 6bc830 8b049538034600 f644082801 }
            // n = 7, score = 100
            //   8bd7                 | mov                 edx, edi
            //   c1fa06               | sar                 edx, 6
            //   8bc7                 | mov                 eax, edi
            //   83e03f               | and                 eax, 0x3f
            //   6bc830               | imul                ecx, eax, 0x30
            //   8b049538034600       | mov                 eax, dword ptr [edx*4 + 0x460338]
            //   f644082801           | test                byte ptr [eax + ecx + 0x28], 1

        $sequence_9 = { ffb544ecffff 51 8d8df8edffff e8???????? 46 3bb550ecffff 0f8239ffffff }
            // n = 7, score = 100
            //   ffb544ecffff         | push                dword ptr [ebp - 0x13bc]
            //   51                   | push                ecx
            //   8d8df8edffff         | lea                 ecx, [ebp - 0x1208]
            //   e8????????           |                     
            //   46                   | inc                 esi
            //   3bb550ecffff         | cmp                 esi, dword ptr [ebp - 0x13b0]
            //   0f8239ffffff         | jb                  0xffffff3f

    condition:
        7 of them and filesize < 834560
}