rule win_lowkey_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.lowkey."
        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.lowkey"
        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 = { 0f84b8000000 452be5 488d15cd64feff 4489642440 0f8534fcffff }
            // n = 5, score = 100
            //   0f84b8000000         | mov                 dword ptr [esp + 0x50], edi
            //   452be5               | dec                 esp
            //   488d15cd64feff       | lea                 eax, [ebp + 0x10]
            //   4489642440           | dec                 eax
            //   0f8534fcffff         | lea                 edx, [esp + 0x48]

        $sequence_1 = { 48891d???????? ff15???????? 4533c0 4489742440 488d542438 85c0 743c }
            // n = 7, score = 100
            //   48891d????????       |                     
            //   ff15????????         |                     
            //   4533c0               | cmp                 dword ptr [ebx + 0x10], esi
            //   4489742440           | jne                 0x857
            //   488d542438           | dec                 eax
            //   85c0                 | mov                 ecx, ebp
            //   743c                 | xor                 ebx, ebx

        $sequence_2 = { e8???????? 33f6 89b42490000000 b891030000 668984248d000000 bd01000000 }
            // n = 6, score = 100
            //   e8????????           |                     
            //   33f6                 | lea                 ecx, [esp + 0x60]
            //   89b42490000000       | inc                 ebp
            //   b891030000           | xor                 ecx, ecx
            //   668984248d000000     | mov                 dword ptr [esp + 0x20], 4
            //   bd01000000           | mov                 edx, 0x40000000

        $sequence_3 = { 442be8 0f848f000000 418d45ff 418b848328ee0100 85c0 }
            // n = 5, score = 100
            //   442be8               | jmp                 0x1c13
            //   0f848f000000         | dec                 eax
            //   418d45ff             | lea                 edx, [0x22517]
            //   418b848328ee0100     | dec                 eax
            //   85c0                 | lea                 ecx, [ebp + 0x170]

        $sequence_4 = { 488d4d30 4c8b4590 4889442428 8b45c0 89442420 }
            // n = 5, score = 100
            //   488d4d30             | dec                 ecx
            //   4c8b4590             | lea                 eax, [ebx - 0x18]
            //   4889442428           | dec                 eax
            //   8b45c0               | mov                 edx, dword ptr [edx + 0x10]
            //   89442420             | dec                 eax

        $sequence_5 = { 33db 8bfa 488bf1 85d2 7e38 660f1f440000 488b0d???????? }
            // n = 7, score = 100
            //   33db                 | dec                 eax
            //   8bfa                 | lea                 edx, [0x1d0c0]
            //   488bf1               | inc                 ebp
            //   85d2                 | xor                 eax, eax
            //   7e38                 | mov                 dword ptr [esp + 0x68], eax
            //   660f1f440000         | dec                 eax
            //   488b0d????????       |                     

        $sequence_6 = { 4885c0 0f95c1 85c9 745b 4885db 740f 483bd8 }
            // n = 7, score = 100
            //   4885c0               | mov                 ebx, eax
            //   0f95c1               | dec                 esp
            //   85c9                 | mov                 dword ptr [esp + 0x30], edi
            //   745b                 | xor                 edx, edx
            //   4885db               | dec                 eax
            //   740f                 | mov                 ecx, eax
            //   483bd8               | dec                 eax

        $sequence_7 = { ff15???????? 85c0 488bce 0f45dd ff15???????? 488bcf ff15???????? }
            // n = 7, score = 100
            //   ff15????????         |                     
            //   85c0                 | xor                 edx, edx
            //   488bce               | movsd               qword ptr [ebp + 0x3f0], xmm0
            //   0f45dd               | inc                 ecx
            //   ff15????????         |                     
            //   488bcf               | mov                 eax, 0x24e
            //   ff15????????         |                     

        $sequence_8 = { 4c8b05???????? 33d2 ff15???????? ff15???????? 488bc8 4c8b05???????? 33d2 }
            // n = 7, score = 100
            //   4c8b05????????       |                     
            //   33d2                 | dec                 eax
            //   ff15????????         |                     
            //   ff15????????         |                     
            //   488bc8               | lea                 ecx, [0x31720]
            //   4c8b05????????       |                     
            //   33d2                 | dec                 eax

        $sequence_9 = { 6689442435 33db 895c2438 418b8604010000 8944243c }
            // n = 5, score = 100
            //   6689442435           | sub                 esp, 0x20
            //   33db                 | mov                 ebx, ecx
            //   895c2438             | dec                 esp
            //   418b8604010000       | lea                 ecx, [0x13299]
            //   8944243c             | dec                 eax

    condition:
        7 of them and filesize < 643072
}