rule win_coredn_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.coredn."
        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.coredn"
        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 = { 51 56 8d45fc 8bf1 50 e8???????? 85c0 }
            // n = 7, score = 600
            //   51                   | push                ecx
            //   56                   | push                esi
            //   8d45fc               | lea                 eax, [ebp - 4]
            //   8bf1                 | mov                 esi, ecx
            //   50                   | push                eax
            //   e8????????           |                     
            //   85c0                 | test                eax, eax

        $sequence_1 = { 7415 8801 41 83ea01 }
            // n = 4, score = 400
            //   7415                 | je                  0x17
            //   8801                 | mov                 byte ptr [ecx], al
            //   41                   | inc                 ecx
            //   83ea01               | sub                 edx, 1

        $sequence_2 = { 53 57 bf00000000 8d0432 2bca 7438 }
            // n = 6, score = 400
            //   53                   | push                ebx
            //   57                   | push                edi
            //   bf00000000           | mov                 edi, 0
            //   8d0432               | lea                 eax, [edx + esi]
            //   2bca                 | sub                 ecx, edx
            //   7438                 | je                  0x3a

        $sequence_3 = { 741c 8818 4a 40 83e901 75ec }
            // n = 6, score = 400
            //   741c                 | je                  0x1e
            //   8818                 | mov                 byte ptr [eax], bl
            //   4a                   | dec                 edx
            //   40                   | inc                 eax
            //   83e901               | sub                 ecx, 1
            //   75ec                 | jne                 0xffffffee

        $sequence_4 = { 5e 5d c20400 c60100 33c0 }
            // n = 5, score = 400
            //   5e                   | pop                 esi
            //   5d                   | pop                 ebp
            //   c20400               | ret                 4
            //   c60100               | mov                 byte ptr [ecx], 0
            //   33c0                 | xor                 eax, eax

        $sequence_5 = { 7423 8a1c06 84db 741c }
            // n = 4, score = 400
            //   7423                 | je                  0x25
            //   8a1c06               | mov                 bl, byte ptr [esi + eax]
            //   84db                 | test                bl, bl
            //   741c                 | je                  0x1e

        $sequence_6 = { 0f1f440000 3811 7408 41 83e801 75f6 }
            // n = 6, score = 400
            //   0f1f440000           | nop                 dword ptr [eax + eax]
            //   3811                 | cmp                 byte ptr [ecx], dl
            //   7408                 | je                  0xa
            //   41                   | inc                 ecx
            //   83e801               | sub                 eax, 1
            //   75f6                 | jne                 0xfffffff8

        $sequence_7 = { 41 83ea01 75e7 8851ff b87a000780 }
            // n = 5, score = 400
            //   41                   | inc                 ecx
            //   83ea01               | sub                 edx, 1
            //   75e7                 | jne                 0xffffffe9
            //   8851ff               | mov                 byte ptr [ecx - 1], dl
            //   b87a000780           | mov                 eax, 0x8007007a

        $sequence_8 = { 740b 6a01 50 e8???????? 83c408 8b442420 85c0 }
            // n = 7, score = 200
            //   740b                 | je                  0xd
            //   6a01                 | push                1
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   8b442420             | mov                 eax, dword ptr [esp + 0x20]
            //   85c0                 | test                eax, eax

        $sequence_9 = { 50 e8???????? 83c40c 6b45e430 8945e0 8d80a8304100 }
            // n = 6, score = 200
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   6b45e430             | imul                eax, dword ptr [ebp - 0x1c], 0x30
            //   8945e0               | mov                 dword ptr [ebp - 0x20], eax
            //   8d80a8304100         | lea                 eax, [eax + 0x4130a8]

        $sequence_10 = { e8???????? 83c408 8d842490040000 50 }
            // n = 4, score = 200
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   8d842490040000       | lea                 eax, [esp + 0x490]
            //   50                   | push                eax

        $sequence_11 = { 8365fc00 8b049d08414100 8b4de0 f644082801 7515 }
            // n = 5, score = 200
            //   8365fc00             | and                 dword ptr [ebp - 4], 0
            //   8b049d08414100       | mov                 eax, dword ptr [ebx*4 + 0x414108]
            //   8b4de0               | mov                 ecx, dword ptr [ebp - 0x20]
            //   f644082801           | test                byte ptr [eax + ecx + 0x28], 1
            //   7515                 | jne                 0x17

        $sequence_12 = { 668945e8 8b45d4 886de5 8b148508414100 8a4c1a2d f6c104 7419 }
            // n = 7, score = 200
            //   668945e8             | mov                 word ptr [ebp - 0x18], ax
            //   8b45d4               | mov                 eax, dword ptr [ebp - 0x2c]
            //   886de5               | mov                 byte ptr [ebp - 0x1b], ch
            //   8b148508414100       | mov                 edx, dword ptr [eax*4 + 0x414108]
            //   8a4c1a2d             | mov                 cl, byte ptr [edx + ebx + 0x2d]
            //   f6c104               | test                cl, 4
            //   7419                 | je                  0x1b

        $sequence_13 = { 6808020000 8d842494040000 6a00 50 e8???????? }
            // n = 5, score = 200
            //   6808020000           | push                0x208
            //   8d842494040000       | lea                 eax, [esp + 0x494]
            //   6a00                 | push                0
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_14 = { 8bcf 8bc7 894de4 399898304100 0f84ea000000 }
            // n = 5, score = 200
            //   8bcf                 | mov                 ecx, edi
            //   8bc7                 | mov                 eax, edi
            //   894de4               | mov                 dword ptr [ebp - 0x1c], ecx
            //   399898304100         | cmp                 dword ptr [eax + 0x413098], ebx
            //   0f84ea000000         | je                  0xf0

    condition:
        7 of them and filesize < 270336
}