rule win_chinad_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        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 = "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 = { 83f9bf 772d ff751c 8b4510 83c6c0 83d7ff 57 }
            // n = 7, score = 200
            //   83f9bf               | cmp                 ecx, -0x41
            //   772d                 | ja                  0x2f
            //   ff751c               | push                dword ptr [ebp + 0x1c]
            //   8b4510               | mov                 eax, dword ptr [ebp + 0x10]
            //   83c6c0               | add                 esi, -0x40
            //   83d7ff               | adc                 edi, -1
            //   57                   | push                edi

        $sequence_1 = { 837df400 7407 c745f001000000 837df400 740a 8b45f4 50 }
            // n = 7, score = 200
            //   837df400             | cmp                 dword ptr [ebp - 0xc], 0
            //   7407                 | je                  9
            //   c745f001000000       | mov                 dword ptr [ebp - 0x10], 1
            //   837df400             | cmp                 dword ptr [ebp - 0xc], 0
            //   740a                 | je                  0xc
            //   8b45f4               | mov                 eax, dword ptr [ebp - 0xc]
            //   50                   | push                eax

        $sequence_2 = { 13f8 039db4fdffff 8b8510fdffff 8bf0 13bdb8fdffff 039d0cfdffff 13bdfcfcffff }
            // n = 7, score = 200
            //   13f8                 | adc                 edi, eax
            //   039db4fdffff         | add                 ebx, dword ptr [ebp - 0x24c]
            //   8b8510fdffff         | mov                 eax, dword ptr [ebp - 0x2f0]
            //   8bf0                 | mov                 esi, eax
            //   13bdb8fdffff         | adc                 edi, dword ptr [ebp - 0x248]
            //   039d0cfdffff         | add                 ebx, dword ptr [ebp - 0x2f4]
            //   13bdfcfcffff         | adc                 edi, dword ptr [ebp - 0x304]

        $sequence_3 = { 11550c ff75d8 ff75d0 e8???????? 0145f4 ffb570ffffff 11550c }
            // n = 7, score = 200
            //   11550c               | adc                 dword ptr [ebp + 0xc], edx
            //   ff75d8               | push                dword ptr [ebp - 0x28]
            //   ff75d0               | push                dword ptr [ebp - 0x30]
            //   e8????????           |                     
            //   0145f4               | add                 dword ptr [ebp - 0xc], eax
            //   ffb570ffffff         | push                dword ptr [ebp - 0x90]
            //   11550c               | adc                 dword ptr [ebp + 0xc], edx

        $sequence_4 = { 13da ff75d8 ff75d0 e8???????? ff75a0 03f0 ff759c }
            // n = 7, score = 200
            //   13da                 | adc                 ebx, edx
            //   ff75d8               | push                dword ptr [ebp - 0x28]
            //   ff75d0               | push                dword ptr [ebp - 0x30]
            //   e8????????           |                     
            //   ff75a0               | push                dword ptr [ebp - 0x60]
            //   03f0                 | add                 esi, eax
            //   ff759c               | push                dword ptr [ebp - 0x64]

        $sequence_5 = { 8b7508 6a08 8d4620 50 8d45f4 50 e8???????? }
            // n = 7, score = 200
            //   8b7508               | mov                 esi, dword ptr [ebp + 8]
            //   6a08                 | push                8
            //   8d4620               | lea                 eax, [esi + 0x20]
            //   50                   | push                eax
            //   8d45f4               | lea                 eax, [ebp - 0xc]
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_6 = { ff15???????? 68???????? 68???????? ff15???????? eb6e 68???????? 6a00 }
            // n = 7, score = 200
            //   ff15????????         |                     
            //   68????????           |                     
            //   68????????           |                     
            //   ff15????????         |                     
            //   eb6e                 | jmp                 0x70
            //   68????????           |                     
            //   6a00                 | push                0

        $sequence_7 = { 8bc2 895598 8b55e0 13cb 898d70ffffff 0facc815 }
            // n = 6, score = 200
            //   8bc2                 | mov                 eax, edx
            //   895598               | mov                 dword ptr [ebp - 0x68], edx
            //   8b55e0               | mov                 edx, dword ptr [ebp - 0x20]
            //   13cb                 | adc                 ecx, ebx
            //   898d70ffffff         | mov                 dword ptr [ebp - 0x90], ecx
            //   0facc815             | shrd                eax, ecx, 0x15

        $sequence_8 = { ba08000000 8d4900 8a48fe 8d4004 0a48fb 0a48fd 0a48fc }
            // n = 7, score = 200
            //   ba08000000           | mov                 edx, 8
            //   8d4900               | lea                 ecx, [ecx]
            //   8a48fe               | mov                 cl, byte ptr [eax - 2]
            //   8d4004               | lea                 eax, [eax + 4]
            //   0a48fb               | or                  cl, byte ptr [eax - 5]
            //   0a48fd               | or                  cl, byte ptr [eax - 3]
            //   0a48fc               | or                  cl, byte ptr [eax - 4]

        $sequence_9 = { 89750c 8b75ec 13da 895df0 8b5ddc 81c300000001 50 }
            // n = 7, score = 200
            //   89750c               | mov                 dword ptr [ebp + 0xc], esi
            //   8b75ec               | mov                 esi, dword ptr [ebp - 0x14]
            //   13da                 | adc                 ebx, edx
            //   895df0               | mov                 dword ptr [ebp - 0x10], ebx
            //   8b5ddc               | mov                 ebx, dword ptr [ebp - 0x24]
            //   81c300000001         | add                 ebx, 0x1000000
            //   50                   | push                eax

    condition:
        7 of them and filesize < 598016
}