rule win_chinotto_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.chinotto."
        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.chinotto"
        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 = { 8bc7 c1f805 8bcf 83e11f c1e106 8b0485400f4200 c644080401 }
            // n = 7, score = 100
            //   8bc7                 | mov                 eax, edi
            //   c1f805               | sar                 eax, 5
            //   8bcf                 | mov                 ecx, edi
            //   83e11f               | and                 ecx, 0x1f
            //   c1e106               | shl                 ecx, 6
            //   8b0485400f4200       | mov                 eax, dword ptr [eax*4 + 0x420f40]
            //   c644080401           | mov                 byte ptr [eax + ecx + 4], 1

        $sequence_1 = { c78424cc01000046003900 c78424d001000034003000 c78424d40100006f005800 c78424d801000078005700 c78424dc01000049004800 c78424e001000076006f00 c78424e401000073003000 }
            // n = 7, score = 100
            //   c78424cc01000046003900     | mov    dword ptr [esp + 0x1cc], 0x390046
            //   c78424d001000034003000     | mov    dword ptr [esp + 0x1d0], 0x300034
            //   c78424d40100006f005800     | mov    dword ptr [esp + 0x1d4], 0x58006f
            //   c78424d801000078005700     | mov    dword ptr [esp + 0x1d8], 0x570078
            //   c78424dc01000049004800     | mov    dword ptr [esp + 0x1dc], 0x480049
            //   c78424e001000076006f00     | mov    dword ptr [esp + 0x1e0], 0x6f0076
            //   c78424e401000073003000     | mov    dword ptr [esp + 0x1e4], 0x300073

        $sequence_2 = { 8b45dc 48 25ff7f0000 8a843090000000 }
            // n = 4, score = 100
            //   8b45dc               | mov                 eax, dword ptr [ebp - 0x24]
            //   48                   | dec                 eax
            //   25ff7f0000           | and                 eax, 0x7fff
            //   8a843090000000       | mov                 al, byte ptr [eax + esi + 0x90]

        $sequence_3 = { 66c7470c7061 66c7470e7468 66c747102066 66c747126169 66c747146c65 83c404 66c747166400 }
            // n = 7, score = 100
            //   66c7470c7061         | mov                 word ptr [edi + 0xc], 0x6170
            //   66c7470e7468         | mov                 word ptr [edi + 0xe], 0x6874
            //   66c747102066         | mov                 word ptr [edi + 0x10], 0x6620
            //   66c747126169         | mov                 word ptr [edi + 0x12], 0x6961
            //   66c747146c65         | mov                 word ptr [edi + 0x14], 0x656c
            //   83c404               | add                 esp, 4
            //   66c747166400         | mov                 word ptr [edi + 0x16], 0x64

        $sequence_4 = { 83c404 66c747046531 32db 6a06 885f06 e8???????? 8b0d???????? }
            // n = 7, score = 100
            //   83c404               | add                 esp, 4
            //   66c747046531         | mov                 word ptr [edi + 4], 0x3165
            //   32db                 | xor                 bl, bl
            //   6a06                 | push                6
            //   885f06               | mov                 byte ptr [edi + 6], bl
            //   e8????????           |                     
            //   8b0d????????         |                     

        $sequence_5 = { c785d0fbffff00000000 e8???????? 8b1d???????? 50 8d85d4fbffff 68???????? 50 }
            // n = 7, score = 100
            //   c785d0fbffff00000000     | mov    dword ptr [ebp - 0x430], 0
            //   e8????????           |                     
            //   8b1d????????         |                     
            //   50                   | push                eax
            //   8d85d4fbffff         | lea                 eax, [ebp - 0x42c]
            //   68????????           |                     
            //   50                   | push                eax

        $sequence_6 = { 66c746106574 66c746126564 c6461400 e8???????? 50 8d8424480a0000 }
            // n = 6, score = 100
            //   66c746106574         | mov                 word ptr [esi + 0x10], 0x7465
            //   66c746126564         | mov                 word ptr [esi + 0x12], 0x6465
            //   c6461400             | mov                 byte ptr [esi + 0x14], 0
            //   e8????????           |                     
            //   50                   | push                eax
            //   8d8424480a0000       | lea                 eax, [esp + 0xa48]

        $sequence_7 = { ffd6 68???????? ffd6 5f 5b 5e 8be5 }
            // n = 7, score = 100
            //   ffd6                 | call                esi
            //   68????????           |                     
            //   ffd6                 | call                esi
            //   5f                   | pop                 edi
            //   5b                   | pop                 ebx
            //   5e                   | pop                 esi
            //   8be5                 | mov                 esp, ebp

        $sequence_8 = { 50 ff15???????? 8b853cf7ffff 03c3 50 e8???????? 8b8d38f7ffff }
            // n = 7, score = 100
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8b853cf7ffff         | mov                 eax, dword ptr [ebp - 0x8c4]
            //   03c3                 | add                 eax, ebx
            //   50                   | push                eax
            //   e8????????           |                     
            //   8b8d38f7ffff         | mov                 ecx, dword ptr [ebp - 0x8c8]

        $sequence_9 = { 52 6802020000 c78424300600002f006100 c784243406000064006d00 c784243806000069006e00 }
            // n = 5, score = 100
            //   52                   | push                edx
            //   6802020000           | push                0x202
            //   c78424300600002f006100     | mov    dword ptr [esp + 0x630], 0x61002f
            //   c784243406000064006d00     | mov    dword ptr [esp + 0x634], 0x6d0064
            //   c784243806000069006e00     | mov    dword ptr [esp + 0x638], 0x6e0069

    condition:
        7 of them and filesize < 300032
}