rule win_helminth_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.helminth."
        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.helminth"
        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 = { a1???????? 68e8030000 8907 e8???????? }
            // n = 4, score = 300
            //   a1????????           |                     
            //   68e8030000           | push                0x3e8
            //   8907                 | mov                 dword ptr [edi], eax
            //   e8????????           |                     

        $sequence_1 = { 0f43ca 880d???????? ff15???????? 83f8ff 7509 c605????????01 eb0d }
            // n = 7, score = 200
            //   0f43ca               | cmovae              ecx, edx
            //   880d????????         |                     
            //   ff15????????         |                     
            //   83f8ff               | cmp                 eax, -1
            //   7509                 | jne                 0xb
            //   c605????????01       |                     
            //   eb0d                 | jmp                 0xf

        $sequence_2 = { 50 ff15???????? c605????????00 b9???????? b8???????? 8bff }
            // n = 6, score = 200
            //   50                   | push                eax
            //   ff15????????         |                     
            //   c605????????00       |                     
            //   b9????????           |                     
            //   b8????????           |                     
            //   8bff                 | mov                 edi, edi

        $sequence_3 = { 83e11f c1e106 83c10c 8b048570750110 03c1 }
            // n = 5, score = 200
            //   83e11f               | and                 ecx, 0x1f
            //   c1e106               | shl                 ecx, 6
            //   83c10c               | add                 ecx, 0xc
            //   8b048570750110       | mov                 eax, dword ptr [eax*4 + 0x10017570]
            //   03c1                 | add                 eax, ecx

        $sequence_4 = { 68e8030000 ff15???????? a1???????? 40 a3???????? 83f81e 7ce5 }
            // n = 7, score = 200
            //   68e8030000           | push                0x3e8
            //   ff15????????         |                     
            //   a1????????           |                     
            //   40                   | inc                 eax
            //   a3????????           |                     
            //   83f81e               | cmp                 eax, 0x1e
            //   7ce5                 | jl                  0xffffffe7

        $sequence_5 = { 7479 b9???????? b8???????? 8d642400 668b10 }
            // n = 5, score = 200
            //   7479                 | je                  0x7b
            //   b9????????           |                     
            //   b8????????           |                     
            //   8d642400             | lea                 esp, [esp]
            //   668b10               | mov                 dx, word ptr [eax]

        $sequence_6 = { 668b0457 42 6689044e 41 3bd3 7cf2 8b45f0 }
            // n = 7, score = 200
            //   668b0457             | mov                 ax, word ptr [edi + edx*2]
            //   42                   | inc                 edx
            //   6689044e             | mov                 word ptr [esi + ecx*2], ax
            //   41                   | inc                 ecx
            //   3bd3                 | cmp                 edx, ebx
            //   7cf2                 | jl                  0xfffffff4
            //   8b45f0               | mov                 eax, dword ptr [ebp - 0x10]

        $sequence_7 = { 2c2c 2c2c 2c2c 2c2c 2c2c 232425???????? }
            // n = 6, score = 200
            //   2c2c                 | sub                 al, 0x2c
            //   2c2c                 | sub                 al, 0x2c
            //   2c2c                 | sub                 al, 0x2c
            //   2c2c                 | sub                 al, 0x2c
            //   2c2c                 | sub                 al, 0x2c
            //   232425????????       |                     

        $sequence_8 = { b823810000 59 0f45f0 8975c8 8bf0 }
            // n = 5, score = 100
            //   b823810000           | mov                 eax, 0x8123
            //   59                   | pop                 ecx
            //   0f45f0               | cmovne              esi, eax
            //   8975c8               | mov                 dword ptr [ebp - 0x38], esi
            //   8bf0                 | mov                 esi, eax

        $sequence_9 = { 8d4c240c 56 ba???????? e8???????? 59 }
            // n = 5, score = 100
            //   8d4c240c             | lea                 ecx, [esp + 0xc]
            //   56                   | push                esi
            //   ba????????           |                     
            //   e8????????           |                     
            //   59                   | pop                 ecx

        $sequence_10 = { 0f8471010000 50 53 ff15???????? 8bd8 68e8030000 }
            // n = 6, score = 100
            //   0f8471010000         | je                  0x177
            //   50                   | push                eax
            //   53                   | push                ebx
            //   ff15????????         |                     
            //   8bd8                 | mov                 ebx, eax
            //   68e8030000           | push                0x3e8

        $sequence_11 = { ba???????? 8b742418 8907 8b44243c 8b7c2438 83c024 }
            // n = 6, score = 100
            //   ba????????           |                     
            //   8b742418             | mov                 esi, dword ptr [esp + 0x18]
            //   8907                 | mov                 dword ptr [edi], eax
            //   8b44243c             | mov                 eax, dword ptr [esp + 0x3c]
            //   8b7c2438             | mov                 edi, dword ptr [esp + 0x38]
            //   83c024               | add                 eax, 0x24

        $sequence_12 = { 83e103 f3a4 e8???????? ff75ec e8???????? }
            // n = 5, score = 100
            //   83e103               | and                 ecx, 3
            //   f3a4                 | rep movsb           byte ptr es:[edi], byte ptr [esi]
            //   e8????????           |                     
            //   ff75ec               | push                dword ptr [ebp - 0x14]
            //   e8????????           |                     

        $sequence_13 = { 75f4 ff75f0 8bca c1e902 }
            // n = 4, score = 100
            //   75f4                 | jne                 0xfffffff6
            //   ff75f0               | push                dword ptr [ebp - 0x10]
            //   8bca                 | mov                 ecx, edx
            //   c1e902               | shr                 ecx, 2

        $sequence_14 = { 2bd1 d1fa 7463 66833c772e 8bcf }
            // n = 5, score = 100
            //   2bd1                 | sub                 edx, ecx
            //   d1fa                 | sar                 edx, 1
            //   7463                 | je                  0x65
            //   66833c772e           | cmp                 word ptr [edi + esi*2], 0x2e
            //   8bcf                 | mov                 ecx, edi

    condition:
        7 of them and filesize < 479232
}