rule win_kuaibu8_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.kuaibu8."
        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.kuaibu8"
        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 = { 68???????? 8b5d0c ff33 68???????? b903000000 e8???????? 83c40c }
            // n = 7, score = 100
            //   68????????           |                     
            //   8b5d0c               | mov                 ebx, dword ptr [ebp + 0xc]
            //   ff33                 | push                dword ptr [ebx]
            //   68????????           |                     
            //   b903000000           | mov                 ecx, 3
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc

        $sequence_1 = { 8945fc 8b5dfc e8???????? 8945f4 837df406 0f8599010000 8b5dfc }
            // n = 7, score = 100
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   8b5dfc               | mov                 ebx, dword ptr [ebp - 4]
            //   e8????????           |                     
            //   8945f4               | mov                 dword ptr [ebp - 0xc], eax
            //   837df406             | cmp                 dword ptr [ebp - 0xc], 6
            //   0f8599010000         | jne                 0x19f
            //   8b5dfc               | mov                 ebx, dword ptr [ebp - 4]

        $sequence_2 = { 58 8945dc 8b5de0 e8???????? 8945c4 837dc405 }
            // n = 6, score = 100
            //   58                   | pop                 eax
            //   8945dc               | mov                 dword ptr [ebp - 0x24], eax
            //   8b5de0               | mov                 ebx, dword ptr [ebp - 0x20]
            //   e8????????           |                     
            //   8945c4               | mov                 dword ptr [ebp - 0x3c], eax
            //   837dc405             | cmp                 dword ptr [ebp - 0x3c], 5

        $sequence_3 = { 57 894c2420 0f87d0000000 0f84ab000000 3d05000080 }
            // n = 5, score = 100
            //   57                   | push                edi
            //   894c2420             | mov                 dword ptr [esp + 0x20], ecx
            //   0f87d0000000         | ja                  0xd6
            //   0f84ab000000         | je                  0xb1
            //   3d05000080           | cmp                 eax, 0x80000005

        $sequence_4 = { 8945fc db45fc dd5de4 dd45e4 dc25???????? dd5ddc dd45dc }
            // n = 7, score = 100
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   db45fc               | fild                dword ptr [ebp - 4]
            //   dd5de4               | fstp                qword ptr [ebp - 0x1c]
            //   dd45e4               | fld                 qword ptr [ebp - 0x1c]
            //   dc25????????         |                     
            //   dd5ddc               | fstp                qword ptr [ebp - 0x24]
            //   dd45dc               | fld                 qword ptr [ebp - 0x24]

        $sequence_5 = { 8b4604 83c404 33c9 85c0 743a 8b54240c 3bc2 }
            // n = 7, score = 100
            //   8b4604               | mov                 eax, dword ptr [esi + 4]
            //   83c404               | add                 esp, 4
            //   33c9                 | xor                 ecx, ecx
            //   85c0                 | test                eax, eax
            //   743a                 | je                  0x3c
            //   8b54240c             | mov                 edx, dword ptr [esp + 0xc]
            //   3bc2                 | cmp                 eax, edx

        $sequence_6 = { 83c404 58 8945e0 8b5de4 e8???????? b801000000 }
            // n = 6, score = 100
            //   83c404               | add                 esp, 4
            //   58                   | pop                 eax
            //   8945e0               | mov                 dword ptr [ebp - 0x20], eax
            //   8b5de4               | mov                 ebx, dword ptr [ebp - 0x1c]
            //   e8????????           |                     
            //   b801000000           | mov                 eax, 1

        $sequence_7 = { b903000000 e8???????? 83c40c 8945e4 8d45e4 50 ff7508 }
            // n = 7, score = 100
            //   b903000000           | mov                 ecx, 3
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   8945e4               | mov                 dword ptr [ebp - 0x1c], eax
            //   8d45e4               | lea                 eax, [ebp - 0x1c]
            //   50                   | push                eax
            //   ff7508               | push                dword ptr [ebp + 8]

        $sequence_8 = { 81ec1c000000 c745fc00000000 c745f800000000 6806000080 6a00 ff7508 6801000000 }
            // n = 7, score = 100
            //   81ec1c000000         | sub                 esp, 0x1c
            //   c745fc00000000       | mov                 dword ptr [ebp - 4], 0
            //   c745f800000000       | mov                 dword ptr [ebp - 8], 0
            //   6806000080           | push                0x80000006
            //   6a00                 | push                0
            //   ff7508               | push                dword ptr [ebp + 8]
            //   6801000000           | push                1

        $sequence_9 = { 6802000000 bb00000000 b8???????? e8???????? 83c41c 8945fc 837d1000 }
            // n = 7, score = 100
            //   6802000000           | push                2
            //   bb00000000           | mov                 ebx, 0
            //   b8????????           |                     
            //   e8????????           |                     
            //   83c41c               | add                 esp, 0x1c
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   837d1000             | cmp                 dword ptr [ebp + 0x10], 0

    condition:
        7 of them and filesize < 737280
}