rule win_woody_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.woody."
        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.woody"
        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 = { 8bd9 6a31 33c0 2045ff 59 8dbda6feffff 8945f8 }
            // n = 7, score = 100
            //   8bd9                 | mov                 ebx, ecx
            //   6a31                 | push                0x31
            //   33c0                 | xor                 eax, eax
            //   2045ff               | and                 byte ptr [ebp - 1], al
            //   59                   | pop                 ecx
            //   8dbda6feffff         | lea                 edi, [ebp - 0x15a]
            //   8945f8               | mov                 dword ptr [ebp - 8], eax

        $sequence_1 = { ff7508 8bce 50 e8???????? 3ac3 0f840a010000 8d8608010000 }
            // n = 7, score = 100
            //   ff7508               | push                dword ptr [ebp + 8]
            //   8bce                 | mov                 ecx, esi
            //   50                   | push                eax
            //   e8????????           |                     
            //   3ac3                 | cmp                 al, bl
            //   0f840a010000         | je                  0x110
            //   8d8608010000         | lea                 eax, [esi + 0x108]

        $sequence_2 = { 83c408 85c0 7410 8d542420 52 ff15???????? e9???????? }
            // n = 7, score = 100
            //   83c408               | add                 esp, 8
            //   85c0                 | test                eax, eax
            //   7410                 | je                  0x12
            //   8d542420             | lea                 edx, [esp + 0x20]
            //   52                   | push                edx
            //   ff15????????         |                     
            //   e9????????           |                     

        $sequence_3 = { 0f8424020000 8b35???????? 68???????? ff75f0 ffd6 68???????? a3???????? }
            // n = 7, score = 100
            //   0f8424020000         | je                  0x22a
            //   8b35????????         |                     
            //   68????????           |                     
            //   ff75f0               | push                dword ptr [ebp - 0x10]
            //   ffd6                 | call                esi
            //   68????????           |                     
            //   a3????????           |                     

        $sequence_4 = { 6864b10110 50 ff15???????? 83c420 b001 5f 5d }
            // n = 7, score = 100
            //   6864b10110           | push                0x1001b164
            //   50                   | push                eax
            //   ff15????????         |                     
            //   83c420               | add                 esp, 0x20
            //   b001                 | mov                 al, 1
            //   5f                   | pop                 edi
            //   5d                   | pop                 ebp

        $sequence_5 = { e9???????? 8b75f0 834dfcff 8d4dd8 e8???????? 8b4df4 8bc6 }
            // n = 7, score = 100
            //   e9????????           |                     
            //   8b75f0               | mov                 esi, dword ptr [ebp - 0x10]
            //   834dfcff             | or                  dword ptr [ebp - 4], 0xffffffff
            //   8d4dd8               | lea                 ecx, [ebp - 0x28]
            //   e8????????           |                     
            //   8b4df4               | mov                 ecx, dword ptr [ebp - 0xc]
            //   8bc6                 | mov                 eax, esi

        $sequence_6 = { 8b45f0 ffb624010000 8b08 50 ff513c 8b45f0 8d550c }
            // n = 7, score = 100
            //   8b45f0               | mov                 eax, dword ptr [ebp - 0x10]
            //   ffb624010000         | push                dword ptr [esi + 0x124]
            //   8b08                 | mov                 ecx, dword ptr [eax]
            //   50                   | push                eax
            //   ff513c               | call                dword ptr [ecx + 0x3c]
            //   8b45f0               | mov                 eax, dword ptr [ebp - 0x10]
            //   8d550c               | lea                 edx, [ebp + 0xc]

        $sequence_7 = { 6820a20110 6802000080 ff15???????? 8b442410 8d4c2430 8d942468010000 51 }
            // n = 7, score = 100
            //   6820a20110           | push                0x1001a220
            //   6802000080           | push                0x80000002
            //   ff15????????         |                     
            //   8b442410             | mov                 eax, dword ptr [esp + 0x10]
            //   8d4c2430             | lea                 ecx, [esp + 0x30]
            //   8d942468010000       | lea                 edx, [esp + 0x168]
            //   51                   | push                ecx

        $sequence_8 = { 8bcb e8???????? 32c0 8b8c24440a0000 5f 5e }
            // n = 6, score = 100
            //   8bcb                 | mov                 ecx, ebx
            //   e8????????           |                     
            //   32c0                 | xor                 al, al
            //   8b8c24440a0000       | mov                 ecx, dword ptr [esp + 0xa44]
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi

        $sequence_9 = { 8d45dc 50 8d4de4 e8???????? 8b38 83c9ff 33c0 }
            // n = 7, score = 100
            //   8d45dc               | lea                 eax, [ebp - 0x24]
            //   50                   | push                eax
            //   8d4de4               | lea                 ecx, [ebp - 0x1c]
            //   e8????????           |                     
            //   8b38                 | mov                 edi, dword ptr [eax]
            //   83c9ff               | or                  ecx, 0xffffffff
            //   33c0                 | xor                 eax, eax

    condition:
        7 of them and filesize < 409600
}