rule win_chinad_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.chinad."
        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.chinad"
        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 = { 0facc31a c1f81a 8945ec 8bc1 8b4de8 0500000002 899d38ffffff }
            // n = 7, score = 200
            //   0facc31a             | shrd                ebx, eax, 0x1a
            //   c1f81a               | sar                 eax, 0x1a
            //   8945ec               | mov                 dword ptr [ebp - 0x14], eax
            //   8bc1                 | mov                 eax, ecx
            //   8b4de8               | mov                 ecx, dword ptr [ebp - 0x18]
            //   0500000002           | add                 eax, 0x2000000
            //   899d38ffffff         | mov                 dword ptr [ebp - 0xc8], ebx

        $sequence_1 = { ff15???????? a1???????? 8b08 894dec 8b55ec 8955fc eb08 }
            // n = 7, score = 200
            //   ff15????????         |                     
            //   a1????????           |                     
            //   8b08                 | mov                 ecx, dword ptr [eax]
            //   894dec               | mov                 dword ptr [ebp - 0x14], ecx
            //   8b55ec               | mov                 edx, dword ptr [ebp - 0x14]
            //   8955fc               | mov                 dword ptr [ebp - 4], edx
            //   eb08                 | jmp                 0xa

        $sequence_2 = { ffb534ffffff 13da 03b5e8feffff ffb548ffffff 139d40ffffff 0500000002 57 }
            // n = 7, score = 200
            //   ffb534ffffff         | push                dword ptr [ebp - 0xcc]
            //   13da                 | adc                 ebx, edx
            //   03b5e8feffff         | add                 esi, dword ptr [ebp - 0x118]
            //   ffb548ffffff         | push                dword ptr [ebp - 0xb8]
            //   139d40ffffff         | adc                 ebx, dword ptr [ebp - 0xc0]
            //   0500000002           | add                 eax, 0x2000000
            //   57                   | push                edi

        $sequence_3 = { 8985dcfeffff 8b8ddcfeffff 8b11 52 e8???????? 83c404 }
            // n = 6, score = 200
            //   8985dcfeffff         | mov                 dword ptr [ebp - 0x124], eax
            //   8b8ddcfeffff         | mov                 ecx, dword ptr [ebp - 0x124]
            //   8b11                 | mov                 edx, dword ptr [ecx]
            //   52                   | push                edx
            //   e8????????           |                     
            //   83c404               | add                 esp, 4

        $sequence_4 = { 50 51 e8???????? ff75d8 0145fc ff75e0 }
            // n = 6, score = 200
            //   50                   | push                eax
            //   51                   | push                ecx
            //   e8????????           |                     
            //   ff75d8               | push                dword ptr [ebp - 0x28]
            //   0145fc               | add                 dword ptr [ebp - 4], eax
            //   ff75e0               | push                dword ptr [ebp - 0x20]

        $sequence_5 = { 8bf1 0bb51cfdffff 8b9524fdffff 0b9530fdffff 238d1cfdffff 239520fdffff 8b8524fdffff }
            // n = 7, score = 200
            //   8bf1                 | mov                 esi, ecx
            //   0bb51cfdffff         | or                  esi, dword ptr [ebp - 0x2e4]
            //   8b9524fdffff         | mov                 edx, dword ptr [ebp - 0x2dc]
            //   0b9530fdffff         | or                  edx, dword ptr [ebp - 0x2d0]
            //   238d1cfdffff         | and                 ecx, dword ptr [ebp - 0x2e4]
            //   239520fdffff         | and                 edx, dword ptr [ebp - 0x2e0]
            //   8b8524fdffff         | mov                 eax, dword ptr [ebp - 0x2dc]

        $sequence_6 = { 85c0 740d c70000000000 c7400400000000 5f 5e 83c8ff }
            // n = 7, score = 200
            //   85c0                 | test                eax, eax
            //   740d                 | je                  0xf
            //   c70000000000         | mov                 dword ptr [eax], 0
            //   c7400400000000       | mov                 dword ptr [eax + 4], 0
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   83c8ff               | or                  eax, 0xffffffff

        $sequence_7 = { 8bcf c1c007 c1c90b 33c8 8b9dc0feffff 8bc7 8bbdd4feffff }
            // n = 7, score = 200
            //   8bcf                 | mov                 ecx, edi
            //   c1c007               | rol                 eax, 7
            //   c1c90b               | ror                 ecx, 0xb
            //   33c8                 | xor                 ecx, eax
            //   8b9dc0feffff         | mov                 ebx, dword ptr [ebp - 0x140]
            //   8bc7                 | mov                 eax, edi
            //   8bbdd4feffff         | mov                 edi, dword ptr [ebp - 0x12c]

        $sequence_8 = { 1975bc 8bf3 0fa4c715 0facf215 c1e015 c1fe15 8bca }
            // n = 7, score = 200
            //   1975bc               | sbb                 dword ptr [ebp - 0x44], esi
            //   8bf3                 | mov                 esi, ebx
            //   0fa4c715             | shld                edi, eax, 0x15
            //   0facf215             | shrd                edx, esi, 0x15
            //   c1e015               | shl                 eax, 0x15
            //   c1fe15               | sar                 esi, 0x15
            //   8bca                 | mov                 ecx, edx

        $sequence_9 = { 50 8d85bcf7ffff 50 e8???????? 8d85bcf7ffff 50 8d853cfaffff }
            // n = 7, score = 200
            //   50                   | push                eax
            //   8d85bcf7ffff         | lea                 eax, [ebp - 0x844]
            //   50                   | push                eax
            //   e8????????           |                     
            //   8d85bcf7ffff         | lea                 eax, [ebp - 0x844]
            //   50                   | push                eax
            //   8d853cfaffff         | lea                 eax, [ebp - 0x5c4]

    condition:
        7 of them and filesize < 598016
}