rule win_montysthree_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.montysthree."
        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.montysthree"
        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 = { 8d4d08 e8???????? 50 68???????? e8???????? 59 59 }
            // n = 7, score = 200
            //   8d4d08               | lea                 ecx, [ebp + 8]
            //   e8????????           |                     
            //   50                   | push                eax
            //   68????????           |                     
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   59                   | pop                 ecx

        $sequence_1 = { 56 8b74240c 83660800 83660c00 85c0 8bd9 c706???????? }
            // n = 7, score = 200
            //   56                   | push                esi
            //   8b74240c             | mov                 esi, dword ptr [esp + 0xc]
            //   83660800             | and                 dword ptr [esi + 8], 0
            //   83660c00             | and                 dword ptr [esi + 0xc], 0
            //   85c0                 | test                eax, eax
            //   8bd9                 | mov                 ebx, ecx
            //   c706????????         |                     

        $sequence_2 = { 8d4d08 e8???????? 83f806 7e67 68???????? 6a06 }
            // n = 6, score = 200
            //   8d4d08               | lea                 ecx, [ebp + 8]
            //   e8????????           |                     
            //   83f806               | cmp                 eax, 6
            //   7e67                 | jle                 0x69
            //   68????????           |                     
            //   6a06                 | push                6

        $sequence_3 = { 8945f8 50 6aff ff7308 57 ff7508 ffd6 }
            // n = 7, score = 200
            //   8945f8               | mov                 dword ptr [ebp - 8], eax
            //   50                   | push                eax
            //   6aff                 | push                -1
            //   ff7308               | push                dword ptr [ebx + 8]
            //   57                   | push                edi
            //   ff7508               | push                dword ptr [ebp + 8]
            //   ffd6                 | call                esi

        $sequence_4 = { 85c0 0f84ed000000 83be180c000000 743b 8b0b 0308 81f900800000 }
            // n = 7, score = 200
            //   85c0                 | test                eax, eax
            //   0f84ed000000         | je                  0xf3
            //   83be180c000000       | cmp                 dword ptr [esi + 0xc18], 0
            //   743b                 | je                  0x3d
            //   8b0b                 | mov                 ecx, dword ptr [ebx]
            //   0308                 | add                 ecx, dword ptr [eax]
            //   81f900800000         | cmp                 ecx, 0x8000

        $sequence_5 = { 53 56 57 ff750c 33db ff7508 33ff }
            // n = 7, score = 200
            //   53                   | push                ebx
            //   56                   | push                esi
            //   57                   | push                edi
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   33db                 | xor                 ebx, ebx
            //   ff7508               | push                dword ptr [ebp + 8]
            //   33ff                 | xor                 edi, edi

        $sequence_6 = { e8???????? 50 ff15???????? 3bc3 0f84be000000 68???????? 50 }
            // n = 7, score = 200
            //   e8????????           |                     
            //   50                   | push                eax
            //   ff15????????         |                     
            //   3bc3                 | cmp                 eax, ebx
            //   0f84be000000         | je                  0xc4
            //   68????????           |                     
            //   50                   | push                eax

        $sequence_7 = { e8???????? 68???????? e8???????? 6a01 6a00 }
            // n = 5, score = 200
            //   e8????????           |                     
            //   68????????           |                     
            //   e8????????           |                     
            //   6a01                 | push                1
            //   6a00                 | push                0

        $sequence_8 = { 5f 7409 ff75fc e8???????? 59 53 e8???????? }
            // n = 7, score = 200
            //   5f                   | pop                 edi
            //   7409                 | je                  0xb
            //   ff75fc               | push                dword ptr [ebp - 4]
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   53                   | push                ebx
            //   e8????????           |                     

        $sequence_9 = { e8???????? 8d4dec e8???????? 8bc7 5f 5b }
            // n = 6, score = 200
            //   e8????????           |                     
            //   8d4dec               | lea                 ecx, [ebp - 0x14]
            //   e8????????           |                     
            //   8bc7                 | mov                 eax, edi
            //   5f                   | pop                 edi
            //   5b                   | pop                 ebx

    condition:
        7 of them and filesize < 458752
}