rule win_overlord_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.overlord."
        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.overlord"
        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 = { e9???????? 31ff e8???????? 8b5c2474 e9???????? 894500 400fb6ff }
            // n = 7, score = 100
            //   e9????????           |                     
            //   31ff                 | dec                 esp
            //   e8????????           |                     
            //   8b5c2474             | mov                 edx, dword ptr [esp + 0x48]
            //   e9????????           |                     
            //   894500               | mov                 edi, eax
            //   400fb6ff             | inc                 ebx

        $sequence_1 = { ffd1 b932000000 4889c7 4889de 31c0 488d1d6fc84e00 0f1f00 }
            // n = 7, score = 100
            //   ffd1                 | dec                 eax
            //   b932000000           | mov                 edx, dword ptr [eax]
            //   4889c7               | nop                 word ptr [eax + eax]
            //   4889de               | dec                 eax
            //   31c0                 | test                edx, edx
            //   488d1d6fc84e00       | je                  0xb3e
            //   0f1f00               | dec                 edx

        $sequence_2 = { 75e3 4889442418 488d052f834200 e8???????? 4889c1 488b442418 6690 }
            // n = 7, score = 100
            //   75e3                 | add                 edi, 0x10
            //   4889442418           | dec                 esp
            //   488d052f834200       | mov                 eax, dword ptr [esp + 0x38]
            //   e8????????           |                     
            //   4889c1               | dec                 ecx
            //   488b442418           | dec                 eax
            //   6690                 | dec                 eax

        $sequence_3 = { e8???????? 488d1571bf2c00 483910 7506 488b7008 eb06 31f6 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   488d1571bf2c00       | test                al, al
            //   483910               | dec                 eax
            //   7506                 | mov                 dword ptr [esp + 0x138], 0
            //   488b7008             | dec                 eax
            //   eb06                 | mov                 edx, dword ptr [ebx + 0x20]
            //   31f6                 | dec                 eax

        $sequence_4 = { e8???????? eb05 83f902 751c 90 b9ffffffff 488d159113a800 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   eb05                 | dec                 eax
            //   83f902               | lea                 eax, [eax + eax*2]
            //   751c                 | dec                 eax
            //   90                   | shl                 eax, 0xa
            //   b9ffffffff           | dec                 eax
            //   488d159113a800       | mov                 dword ptr [esp + 0x50], eax

        $sequence_5 = { 8b8c24b0000000 488b9180010000 e8???????? 488bb42488000000 498933 49894308 49895310 }
            // n = 7, score = 100
            //   8b8c24b0000000       | dec                 eax
            //   488b9180010000       | mov                 ecx, dword ptr [esp + 0x110]
            //   e8????????           |                     
            //   488bb42488000000     | dec                 eax
            //   498933               | mov                 edx, dword ptr [ecx + 0x60]
            //   49894308             | dec                 eax
            //   49895310             | lea                 eax, [0xa9ac7c]

        $sequence_6 = { f30f6f51f0 f30f6f71f0 f3450f6f40c0 66410fdbcd 66410fdbd5 66440f6f3424 660f67d9 }
            // n = 7, score = 100
            //   f30f6f51f0           | arpl                word ptr [ebp + 0x5f88], ax
            //   f30f6f71f0           | dec                 eax
            //   f3450f6f40c0         | mov                 ecx, dword ptr [eax + 0x30b0]
            //   66410fdbcd           | dec                 ebp
            //   66410fdbd5           | add                 eax, eax
            //   66440f6f3424         | test                esi, esi
            //   660f67d9             | jne                 0x388

        $sequence_7 = { e8???????? 4c8b9c2460010000 4d8b4b18 4c8b9c2400010000 4d0fafcb 4c01d9 4d01dc }
            // n = 7, score = 100
            //   e8????????           |                     
            //   4c8b9c2460010000     | dec                 ecx
            //   4d8b4b18             | cmp                 dword ptr [esp + 0x20], 0
            //   4c8b9c2400010000     | jne                 0x38b
            //   4d0fafcb             | dec                 esp
            //   4c01d9               | lea                 esi, [0x26d8cd2]
            //   4d01dc               | dec                 esp

        $sequence_8 = { f30f2cd0 90 eb62 488d3537152a00 4839f2 754e 418b10 }
            // n = 7, score = 100
            //   f30f2cd0             | xor                 ebp, ebp
            //   90                   | inc                 sp
            //   eb62                 | mov                 dword ptr [eax], esp
            //   488d3537152a00       | dec                 ecx
            //   4839f2               | mov                 ebp, ebx
            //   754e                 | mov                 ebx, dword ptr [esp + 0x98]
            //   418b10               | cmp                 dword ptr [esp + 0x80], 3

        $sequence_9 = { ffd6 488b8ba8020000 ffd6 488b8b50020000 ffd6 488d4378 48394370 }
            // n = 7, score = 100
            //   ffd6                 | test                edi, edi
            //   488b8ba8020000       | je                  0x10e4
            //   ffd6                 | dec                 eax
            //   488b8b50020000       | mov                 eax, dword ptr [edi + 0x30]
            //   ffd6                 | dec                 eax
            //   488d4378             | test                eax, eax
            //   48394370             | je                  0x10d8

    condition:
        7 of them and filesize < 91286528
}