rule win_c0d0so0_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.c0d0so0."
        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.c0d0so0"
        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 = { 33c0 eb05 895f10 8bc7 5f 5e 5b }
            // n = 7, score = 600
            //   33c0                 | xor                 eax, eax
            //   eb05                 | jmp                 7
            //   895f10               | mov                 dword ptr [edi + 0x10], ebx
            //   8bc7                 | mov                 eax, edi
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   5b                   | pop                 ebx

        $sequence_1 = { 2501000080 7905 48 83c8fe 40 fec0 }
            // n = 6, score = 600
            //   2501000080           | and                 eax, 0x80000001
            //   7905                 | jns                 7
            //   48                   | dec                 eax
            //   83c8fe               | or                  eax, 0xfffffffe
            //   40                   | inc                 eax
            //   fec0                 | inc                 al

        $sequence_2 = { 8bf0 ff15???????? b8???????? 3bf3 7410 }
            // n = 5, score = 600
            //   8bf0                 | mov                 esi, eax
            //   ff15????????         |                     
            //   b8????????           |                     
            //   3bf3                 | cmp                 esi, ebx
            //   7410                 | je                  0x12

        $sequence_3 = { 72d9 5e 33c0 40 5d c3 }
            // n = 6, score = 600
            //   72d9                 | jb                  0xffffffdb
            //   5e                   | pop                 esi
            //   33c0                 | xor                 eax, eax
            //   40                   | inc                 eax
            //   5d                   | pop                 ebp
            //   c3                   | ret                 

        $sequence_4 = { 33c9 8b02 85c0 740f 8b00 47 89048e }
            // n = 7, score = 600
            //   33c9                 | xor                 ecx, ecx
            //   8b02                 | mov                 eax, dword ptr [edx]
            //   85c0                 | test                eax, eax
            //   740f                 | je                  0x11
            //   8b00                 | mov                 eax, dword ptr [eax]
            //   47                   | inc                 edi
            //   89048e               | mov                 dword ptr [esi + ecx*4], eax

        $sequence_5 = { ff15???????? 03c7 b9c39e2600 69c0fd430300 }
            // n = 4, score = 600
            //   ff15????????         |                     
            //   03c7                 | add                 eax, edi
            //   b9c39e2600           | mov                 ecx, 0x269ec3
            //   69c0fd430300         | imul                eax, eax, 0x343fd

        $sequence_6 = { 50 33ff ff15???????? 8d4598 50 ff15???????? }
            // n = 6, score = 600
            //   50                   | push                eax
            //   33ff                 | xor                 edi, edi
            //   ff15????????         |                     
            //   8d4598               | lea                 eax, [ebp - 0x68]
            //   50                   | push                eax
            //   ff15????????         |                     

        $sequence_7 = { 663908 7404 33c0 c9 c3 53 }
            // n = 6, score = 600
            //   663908               | cmp                 word ptr [eax], cx
            //   7404                 | je                  6
            //   33c0                 | xor                 eax, eax
            //   c9                   | leave               
            //   c3                   | ret                 
            //   53                   | push                ebx

        $sequence_8 = { 3b35???????? 72d9 5e 33c0 40 5d c3 }
            // n = 7, score = 600
            //   3b35????????         |                     
            //   72d9                 | jb                  0xffffffdb
            //   5e                   | pop                 esi
            //   33c0                 | xor                 eax, eax
            //   40                   | inc                 eax
            //   5d                   | pop                 ebp
            //   c3                   | ret                 

        $sequence_9 = { 57 03c1 8b4df4 33ff 47 a3???????? e8???????? }
            // n = 7, score = 600
            //   57                   | push                edi
            //   03c1                 | add                 eax, ecx
            //   8b4df4               | mov                 ecx, dword ptr [ebp - 0xc]
            //   33ff                 | xor                 edi, edi
            //   47                   | inc                 edi
            //   a3????????           |                     
            //   e8????????           |                     

    condition:
        7 of them and filesize < 450560
}