rule win_orchard_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.orchard."
        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.orchard"
        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 = { 83f81f 0f877e030000 52 51 }
            // n = 4, score = 200
            //   83f81f               | cmp                 eax, 0x1f
            //   0f877e030000         | ja                  0x384
            //   52                   | push                edx
            //   51                   | push                ecx

        $sequence_1 = { 56 ff15???????? ff15???????? 50 6a00 }
            // n = 5, score = 200
            //   56                   | push                esi
            //   ff15????????         |                     
            //   ff15????????         |                     
            //   50                   | push                eax
            //   6a00                 | push                0

        $sequence_2 = { 89542428 8b54240c 83d200 03c1 }
            // n = 4, score = 200
            //   89542428             | mov                 dword ptr [esp + 0x28], edx
            //   8b54240c             | mov                 edx, dword ptr [esp + 0xc]
            //   83d200               | adc                 edx, 0
            //   03c1                 | add                 eax, ecx

        $sequence_3 = { c645fc08 e8???????? 894604 83c404 }
            // n = 4, score = 200
            //   c645fc08             | mov                 byte ptr [ebp - 4], 8
            //   e8????????           |                     
            //   894604               | mov                 dword ptr [esi + 4], eax
            //   83c404               | add                 esp, 4

        $sequence_4 = { 8d442410 50 ff15???????? 6685c0 }
            // n = 4, score = 200
            //   8d442410             | lea                 eax, [esp + 0x10]
            //   50                   | push                eax
            //   ff15????????         |                     
            //   6685c0               | test                ax, ax

        $sequence_5 = { 83c404 e8???????? 99 b95b000000 }
            // n = 4, score = 200
            //   83c404               | add                 esp, 4
            //   e8????????           |                     
            //   99                   | cdq                 
            //   b95b000000           | mov                 ecx, 0x5b

        $sequence_6 = { 8b75a8 46 56 e8???????? }
            // n = 4, score = 200
            //   8b75a8               | mov                 esi, dword ptr [ebp - 0x58]
            //   46                   | inc                 esi
            //   56                   | push                esi
            //   e8????????           |                     

        $sequence_7 = { f7f9 81c2d0070000 52 ffd6 }
            // n = 4, score = 200
            //   f7f9                 | idiv                ecx
            //   81c2d0070000         | add                 edx, 0x7d0
            //   52                   | push                edx
            //   ffd6                 | call                esi

        $sequence_8 = { 8954240c 8bc6 ba7a14ae47 f7e2 }
            // n = 4, score = 200
            //   8954240c             | mov                 dword ptr [esp + 0xc], edx
            //   8bc6                 | mov                 eax, esi
            //   ba7a14ae47           | mov                 edx, 0x47ae147a
            //   f7e2                 | mul                 edx

        $sequence_9 = { c70407???????? 8b07 8b4804 8d41e0 894439fc c745fc07000000 }
            // n = 6, score = 200
            //   c70407????????       |                     
            //   8b07                 | mov                 eax, dword ptr [edi]
            //   8b4804               | mov                 ecx, dword ptr [eax + 4]
            //   8d41e0               | lea                 eax, [ecx - 0x20]
            //   894439fc             | mov                 dword ptr [ecx + edi - 4], eax
            //   c745fc07000000       | mov                 dword ptr [ebp - 4], 7

        $sequence_10 = { 83c804 50 e8???????? 8b55e0 8b7de8 }
            // n = 5, score = 200
            //   83c804               | or                  eax, 4
            //   50                   | push                eax
            //   e8????????           |                     
            //   8b55e0               | mov                 edx, dword ptr [ebp - 0x20]
            //   8b7de8               | mov                 edi, dword ptr [ebp - 0x18]

        $sequence_11 = { 50 ff15???????? 83f805 7507 }
            // n = 4, score = 200
            //   50                   | push                eax
            //   ff15????????         |                     
            //   83f805               | cmp                 eax, 5
            //   7507                 | jne                 9

        $sequence_12 = { 89542420 f7e1 8bc8 8954240c }
            // n = 4, score = 200
            //   89542420             | mov                 dword ptr [esp + 0x20], edx
            //   f7e1                 | mul                 ecx
            //   8bc8                 | mov                 ecx, eax
            //   8954240c             | mov                 dword ptr [esp + 0xc], edx

        $sequence_13 = { 8955e0 8b02 8b4004 c70402???????? }
            // n = 4, score = 200
            //   8955e0               | mov                 dword ptr [ebp - 0x20], edx
            //   8b02                 | mov                 eax, dword ptr [edx]
            //   8b4004               | mov                 eax, dword ptr [eax + 4]
            //   c70402????????       |                     

        $sequence_14 = { 8bc8 8d4560 8d9da0feffff c645fc14 e8???????? }
            // n = 5, score = 100
            //   8bc8                 | mov                 ecx, eax
            //   8d4560               | lea                 eax, [ebp + 0x60]
            //   8d9da0feffff         | lea                 ebx, [ebp - 0x160]
            //   c645fc14             | mov                 byte ptr [ebp - 4], 0x14
            //   e8????????           |                     

        $sequence_15 = { 8bc8 8d457c 8d9d48ffffff c645fc17 }
            // n = 4, score = 100
            //   8bc8                 | mov                 ecx, eax
            //   8d457c               | lea                 eax, [ebp + 0x7c]
            //   8d9d48ffffff         | lea                 ebx, [ebp - 0xb8]
            //   c645fc17             | mov                 byte ptr [ebp - 4], 0x17

    condition:
        7 of them and filesize < 4716352
}