rule win_woody_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        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 = "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 = { 8d4604 8d4d08 50 e8???????? 81c608010000 8d4d08 56 }
            // n = 7, score = 100
            //   8d4604               | lea                 eax, [esi + 4]
            //   8d4d08               | lea                 ecx, [ebp + 8]
            //   50                   | push                eax
            //   e8????????           |                     
            //   81c608010000         | add                 esi, 0x108
            //   8d4d08               | lea                 ecx, [ebp + 8]
            //   56                   | push                esi

        $sequence_1 = { 8bf0 e8???????? 84c0 750d 5f 5e 5d }
            // n = 7, score = 100
            //   8bf0                 | mov                 esi, eax
            //   e8????????           |                     
            //   84c0                 | test                al, al
            //   750d                 | jne                 0xf
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   5d                   | pop                 ebp

        $sequence_2 = { ff15???????? 85c0 0f8550010000 b931000000 8d7c2429 88442428 c68424b801000000 }
            // n = 7, score = 100
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   0f8550010000         | jne                 0x156
            //   b931000000           | mov                 ecx, 0x31
            //   8d7c2429             | lea                 edi, [esp + 0x29]
            //   88442428             | mov                 byte ptr [esp + 0x28], al
            //   c68424b801000000     | mov                 byte ptr [esp + 0x1b8], 0

        $sequence_3 = { 8d842478010000 53 50 e8???????? 83c414 8d8c246c010000 68b4000000 }
            // n = 7, score = 100
            //   8d842478010000       | lea                 eax, [esp + 0x178]
            //   53                   | push                ebx
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c414               | add                 esp, 0x14
            //   8d8c246c010000       | lea                 ecx, [esp + 0x16c]
            //   68b4000000           | push                0xb4

        $sequence_4 = { e8???????? 83c404 8d4c2410 6a00 51 6878150000 68b4b20110 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   8d4c2410             | lea                 ecx, [esp + 0x10]
            //   6a00                 | push                0
            //   51                   | push                ecx
            //   6878150000           | push                0x1578
            //   68b4b20110           | push                0x1001b2b4

        $sequence_5 = { 890cd0 8b4dd0 8b55d4 03d1 8b4df4 8954c804 ff45f4 }
            // n = 7, score = 100
            //   890cd0               | mov                 dword ptr [eax + edx*8], ecx
            //   8b4dd0               | mov                 ecx, dword ptr [ebp - 0x30]
            //   8b55d4               | mov                 edx, dword ptr [ebp - 0x2c]
            //   03d1                 | add                 edx, ecx
            //   8b4df4               | mov                 ecx, dword ptr [ebp - 0xc]
            //   8954c804             | mov                 dword ptr [eax + ecx*8 + 4], edx
            //   ff45f4               | inc                 dword ptr [ebp - 0xc]

        $sequence_6 = { 50 8d8520ffffff 50 8d45f0 50 53 }
            // n = 6, score = 100
            //   50                   | push                eax
            //   8d8520ffffff         | lea                 eax, [ebp - 0xe0]
            //   50                   | push                eax
            //   8d45f0               | lea                 eax, [ebp - 0x10]
            //   50                   | push                eax
            //   53                   | push                ebx

        $sequence_7 = { ffd3 83f8ff 740e 50 ff15???????? b007 e9???????? }
            // n = 7, score = 100
            //   ffd3                 | call                ebx
            //   83f8ff               | cmp                 eax, -1
            //   740e                 | je                  0x10
            //   50                   | push                eax
            //   ff15????????         |                     
            //   b007                 | mov                 al, 7
            //   e9????????           |                     

        $sequence_8 = { 83c404 663bc3 7606 66a3???????? 8d9540ffffff 68e8ea0110 52 }
            // n = 7, score = 100
            //   83c404               | add                 esp, 4
            //   663bc3               | cmp                 ax, bx
            //   7606                 | jbe                 8
            //   66a3????????         |                     
            //   8d9540ffffff         | lea                 edx, [ebp - 0xc0]
            //   68e8ea0110           | push                0x1001eae8
            //   52                   | push                edx

        $sequence_9 = { 5b 81c470020000 c20400 8b442418 50 ff15???????? 5f }
            // n = 7, score = 100
            //   5b                   | pop                 ebx
            //   81c470020000         | add                 esp, 0x270
            //   c20400               | ret                 4
            //   8b442418             | mov                 eax, dword ptr [esp + 0x18]
            //   50                   | push                eax
            //   ff15????????         |                     
            //   5f                   | pop                 edi

    condition:
        7 of them and filesize < 409600
}