rule win_winos_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.winos."
        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.winos"
        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 = { 51 ff15???????? 8b8554faffff 83e800 7406 48 7510 }
            // n = 7, score = 100
            //   51                   | push                ecx
            //   ff15????????         |                     
            //   8b8554faffff         | mov                 eax, dword ptr [ebp - 0x5ac]
            //   83e800               | sub                 eax, 0
            //   7406                 | je                  8
            //   48                   | dec                 eax
            //   7510                 | jne                 0x12

        $sequence_1 = { 8b5d08 8d45a8 50 6a54 51 }
            // n = 5, score = 100
            //   8b5d08               | mov                 ebx, dword ptr [ebp + 8]
            //   8d45a8               | lea                 eax, [ebp - 0x58]
            //   50                   | push                eax
            //   6a54                 | push                0x54
            //   51                   | push                ecx

        $sequence_2 = { 83c304 50 899d48feffff ffd2 }
            // n = 4, score = 100
            //   83c304               | add                 ebx, 4
            //   50                   | push                eax
            //   899d48feffff         | mov                 dword ptr [ebp - 0x1b8], ebx
            //   ffd2                 | call                edx

        $sequence_3 = { 51 ff15???????? 8b95dcfeffff 52 ff15???????? 81fb00200000 }
            // n = 6, score = 100
            //   51                   | push                ecx
            //   ff15????????         |                     
            //   8b95dcfeffff         | mov                 edx, dword ptr [ebp - 0x124]
            //   52                   | push                edx
            //   ff15????????         |                     
            //   81fb00200000         | cmp                 ebx, 0x2000

        $sequence_4 = { 8b4b0c 898e20020000 c7862402000001000000 8b7b14 }
            // n = 4, score = 100
            //   8b4b0c               | mov                 ecx, dword ptr [ebx + 0xc]
            //   898e20020000         | mov                 dword ptr [esi + 0x220], ecx
            //   c7862402000001000000     | mov    dword ptr [esi + 0x224], 1
            //   8b7b14               | mov                 edi, dword ptr [ebx + 0x14]

        $sequence_5 = { 8bcb ffd0 56 e8???????? 8b4c2418 83c404 }
            // n = 6, score = 100
            //   8bcb                 | mov                 ecx, ebx
            //   ffd0                 | call                eax
            //   56                   | push                esi
            //   e8????????           |                     
            //   8b4c2418             | mov                 ecx, dword ptr [esp + 0x18]
            //   83c404               | add                 esp, 4

        $sequence_6 = { 0f8492000000 8d8de8fbffff 51 8d95f0fbffff 52 8d85fcfbffff }
            // n = 6, score = 100
            //   0f8492000000         | je                  0x98
            //   8d8de8fbffff         | lea                 ecx, [ebp - 0x418]
            //   51                   | push                ecx
            //   8d95f0fbffff         | lea                 edx, [ebp - 0x410]
            //   52                   | push                edx
            //   8d85fcfbffff         | lea                 eax, [ebp - 0x404]

        $sequence_7 = { 52 8b35???????? ffd6 8b85d4fdffff }
            // n = 4, score = 100
            //   52                   | push                edx
            //   8b35????????         |                     
            //   ffd6                 | call                esi
            //   8b85d4fdffff         | mov                 eax, dword ptr [ebp - 0x22c]

        $sequence_8 = { ffd7 50 8d8e96020000 51 6aff 8d55c8 52 }
            // n = 7, score = 100
            //   ffd7                 | call                edi
            //   50                   | push                eax
            //   8d8e96020000         | lea                 ecx, [esi + 0x296]
            //   51                   | push                ecx
            //   6aff                 | push                -1
            //   8d55c8               | lea                 edx, [ebp - 0x38]
            //   52                   | push                edx

        $sequence_9 = { 85c0 7e77 8d85e8f7ffff 50 ff15???????? 0fb78df4f7ffff 0fb795f2f7ffff }
            // n = 7, score = 100
            //   85c0                 | test                eax, eax
            //   7e77                 | jle                 0x79
            //   8d85e8f7ffff         | lea                 eax, [ebp - 0x818]
            //   50                   | push                eax
            //   ff15????????         |                     
            //   0fb78df4f7ffff       | movzx               ecx, word ptr [ebp - 0x80c]
            //   0fb795f2f7ffff       | movzx               edx, word ptr [ebp - 0x80e]

    condition:
        7 of them and filesize < 457728
}