rule win_neconyd_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.neconyd."
        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.neconyd"
        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 = { 740c 40 394510 7644 66890c47 8bd8 83f802 }
            // n = 7, score = 100
            //   740c                 | je                  0xe
            //   40                   | inc                 eax
            //   394510               | cmp                 dword ptr [ebp + 0x10], eax
            //   7644                 | jbe                 0x46
            //   66890c47             | mov                 word ptr [edi + eax*2], cx
            //   8bd8                 | mov                 ebx, eax
            //   83f802               | cmp                 eax, 2

        $sequence_1 = { 6a15 8d44243c 50 ff74241c ff15???????? 89442424 }
            // n = 6, score = 100
            //   6a15                 | push                0x15
            //   8d44243c             | lea                 eax, [esp + 0x3c]
            //   50                   | push                eax
            //   ff74241c             | push                dword ptr [esp + 0x1c]
            //   ff15????????         |                     
            //   89442424             | mov                 dword ptr [esp + 0x24], eax

        $sequence_2 = { 89450c 7503 897d0c 8b5d0c eb0a e8???????? }
            // n = 6, score = 100
            //   89450c               | mov                 dword ptr [ebp + 0xc], eax
            //   7503                 | jne                 5
            //   897d0c               | mov                 dword ptr [ebp + 0xc], edi
            //   8b5d0c               | mov                 ebx, dword ptr [ebp + 0xc]
            //   eb0a                 | jmp                 0xc
            //   e8????????           |                     

        $sequence_3 = { 6a08 ff35???????? ffd7 8bf8 85ff 897df0 0f844f010000 }
            // n = 7, score = 100
            //   6a08                 | push                8
            //   ff35????????         |                     
            //   ffd7                 | call                edi
            //   8bf8                 | mov                 edi, eax
            //   85ff                 | test                edi, edi
            //   897df0               | mov                 dword ptr [ebp - 0x10], edi
            //   0f844f010000         | je                  0x155

        $sequence_4 = { 8b45fc e8???????? 8bf8 83ff01 59 59 }
            // n = 6, score = 100
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   e8????????           |                     
            //   8bf8                 | mov                 edi, eax
            //   83ff01               | cmp                 edi, 1
            //   59                   | pop                 ecx
            //   59                   | pop                 ecx

        $sequence_5 = { ffd3 50 ff15???????? 8b450c 5f 5b 5e }
            // n = 7, score = 100
            //   ffd3                 | call                ebx
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]
            //   5f                   | pop                 edi
            //   5b                   | pop                 ebx
            //   5e                   | pop                 esi

        $sequence_6 = { 85c9 7424 85f6 7420 7620 662101 }
            // n = 6, score = 100
            //   85c9                 | test                ecx, ecx
            //   7424                 | je                  0x26
            //   85f6                 | test                esi, esi
            //   7420                 | je                  0x22
            //   7620                 | jbe                 0x22
            //   662101               | and                 word ptr [ecx], ax

        $sequence_7 = { 8bd3 e8???????? 59 8d45c0 50 ba???????? e8???????? }
            // n = 7, score = 100
            //   8bd3                 | mov                 edx, ebx
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   8d45c0               | lea                 eax, [ebp - 0x40]
            //   50                   | push                eax
            //   ba????????           |                     
            //   e8????????           |                     

        $sequence_8 = { 8d5c3701 8a03 84c0 0f8eda000000 3c1e 0f8fd2000000 }
            // n = 6, score = 100
            //   8d5c3701             | lea                 ebx, [edi + esi + 1]
            //   8a03                 | mov                 al, byte ptr [ebx]
            //   84c0                 | test                al, al
            //   0f8eda000000         | jle                 0xe0
            //   3c1e                 | cmp                 al, 0x1e
            //   0f8fd2000000         | jg                  0xd8

        $sequence_9 = { 8d45f4 50 e8???????? 8d85d8feffff }
            // n = 4, score = 100
            //   8d45f4               | lea                 eax, [ebp - 0xc]
            //   50                   | push                eax
            //   e8????????           |                     
            //   8d85d8feffff         | lea                 eax, [ebp - 0x128]

    condition:
        7 of them and filesize < 326182
}