rule win_helminth_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        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 = "20260422"
        malpedia_hash = "a182e35da64e6d71cb55f125c4d4225196523f14"
        malpedia_version = "20260504"
        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 = { b9???????? e8???????? b9???????? e8???????? 8b35???????? b800100000 8b0d???????? }
            // n = 7, score = 200
            //   b9????????           |                     
            //   e8????????           |                     
            //   b9????????           |                     
            //   e8????????           |                     
            //   8b35????????         |                     
            //   b800100000           | mov                 eax, 0x1000
            //   8b0d????????         |                     

        $sequence_2 = { 897de0 8b049d70750110 0500080000 3bf8 0f839c000000 f6470401 755b }
            // n = 7, score = 200
            //   897de0               | mov                 dword ptr [ebp - 0x20], edi
            //   8b049d70750110       | mov                 eax, dword ptr [ebx*4 + 0x10017570]
            //   0500080000           | add                 eax, 0x800
            //   3bf8                 | cmp                 edi, eax
            //   0f839c000000         | jae                 0xa2
            //   f6470401             | test                byte ptr [edi + 4], 1
            //   755b                 | jne                 0x5d

        $sequence_3 = { ffb5f4fdffff 8d85fcfdffff 6a0a 6a01 57 50 }
            // n = 6, score = 200
            //   ffb5f4fdffff         | push                dword ptr [ebp - 0x20c]
            //   8d85fcfdffff         | lea                 eax, [ebp - 0x204]
            //   6a0a                 | push                0xa
            //   6a01                 | push                1
            //   57                   | push                edi
            //   50                   | push                eax

        $sequence_4 = { c1e106 8b048570750110 804c080420 8b4d14 }
            // n = 4, score = 200
            //   c1e106               | shl                 ecx, 6
            //   8b048570750110       | mov                 eax, dword ptr [eax*4 + 0x10017570]
            //   804c080420           | or                  byte ptr [eax + ecx + 4], 0x20
            //   8b4d14               | mov                 ecx, dword ptr [ebp + 0x14]

        $sequence_5 = { 75f0 8b75f0 b9???????? 8bd6 2bd1 }
            // n = 5, score = 200
            //   75f0                 | jne                 0xfffffff2
            //   8b75f0               | mov                 esi, dword ptr [ebp - 0x10]
            //   b9????????           |                     
            //   8bd6                 | mov                 edx, esi
            //   2bd1                 | sub                 edx, ecx

        $sequence_6 = { 895df0 ff15???????? 50 ff15???????? 85c0 7406 8d4df4 }
            // n = 7, score = 200
            //   895df0               | mov                 dword ptr [ebp - 0x10], ebx
            //   ff15????????         |                     
            //   50                   | push                eax
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   7406                 | je                  8
            //   8d4df4               | lea                 ecx, [ebp - 0xc]

        $sequence_7 = { 2c2c 13142c 2c2c 2c2c }
            // n = 4, score = 200
            //   2c2c                 | sub                 al, 0x2c
            //   13142c               | adc                 edx, dword ptr [esp + ebp]
            //   2c2c                 | sub                 al, 0x2c
            //   2c2c                 | sub                 al, 0x2c

        $sequence_8 = { 2b742414 894c2424 0fb70a 66890c16 8d5202 }
            // n = 5, score = 100
            //   2b742414             | sub                 esi, dword ptr [esp + 0x14]
            //   894c2424             | mov                 dword ptr [esp + 0x24], ecx
            //   0fb70a               | movzx               ecx, word ptr [edx]
            //   66890c16             | mov                 word ptr [esi + edx], cx
            //   8d5202               | lea                 edx, [edx + 2]

        $sequence_9 = { 68???????? 50 ff15???????? 8945c0 85c0 }
            // n = 5, score = 100
            //   68????????           |                     
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8945c0               | mov                 dword ptr [ebp - 0x40], eax
            //   85c0                 | test                eax, eax

        $sequence_10 = { e8???????? 8b75c8 59 56 }
            // n = 4, score = 100
            //   e8????????           |                     
            //   8b75c8               | mov                 esi, dword ptr [ebp - 0x38]
            //   59                   | pop                 ecx
            //   56                   | push                esi

        $sequence_11 = { 66890c17 8d5202 6685c9 75f1 8b542410 33ff }
            // n = 6, score = 100
            //   66890c17             | mov                 word ptr [edi + edx], cx
            //   8d5202               | lea                 edx, [edx + 2]
            //   6685c9               | test                cx, cx
            //   75f1                 | jne                 0xfffffff3
            //   8b542410             | mov                 edx, dword ptr [esp + 0x10]
            //   33ff                 | xor                 edi, edi

        $sequence_12 = { 663b0473 7510 46 42 3bd7 7ced }
            // n = 6, score = 100
            //   663b0473             | cmp                 ax, word ptr [ebx + esi*2]
            //   7510                 | jne                 0x12
            //   46                   | inc                 esi
            //   42                   | inc                 edx
            //   3bd7                 | cmp                 edx, edi
            //   7ced                 | jl                  0xffffffef

        $sequence_13 = { 75f4 2b4d08 d1f9 3bd1 }
            // n = 4, score = 100
            //   75f4                 | jne                 0xfffffff6
            //   2b4d08               | sub                 ecx, dword ptr [ebp + 8]
            //   d1f9                 | sar                 ecx, 1
            //   3bd1                 | cmp                 edx, ecx

        $sequence_14 = { 50 e8???????? 83c40c 89b5e8feffff }
            // n = 4, score = 100
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   89b5e8feffff         | mov                 dword ptr [ebp - 0x118], esi

    condition:
        7 of them and filesize < 479232
}