rule win_nokki_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-03-28"
        version = "1"
        description = "Detects win.nokki."
        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.nokki"
        malpedia_rule_date = "20230328"
        malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d"
        malpedia_version = "20230407"
        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 = { e8???????? 33d2 68ce070000 52 }
            // n = 4, score = 200
            //   e8????????           |                     
            //   33d2                 | xor                 edx, edx
            //   68ce070000           | push                0x7ce
            //   52                   | push                edx

        $sequence_1 = { e8???????? 33c9 68ce070000 51 }
            // n = 4, score = 200
            //   e8????????           |                     
            //   33c9                 | xor                 ecx, ecx
            //   68ce070000           | push                0x7ce
            //   51                   | push                ecx

        $sequence_2 = { 75e6 c6460401 830eff 2b34bd80054100 }
            // n = 4, score = 100
            //   75e6                 | jne                 0xffffffe8
            //   c6460401             | mov                 byte ptr [esi + 4], 1
            //   830eff               | or                  dword ptr [esi], 0xffffffff
            //   2b34bd80054100       | sub                 esi, dword ptr [edi*4 + 0x410580]

        $sequence_3 = { c705????????6a464000 8935???????? a3???????? ff15???????? }
            // n = 4, score = 100
            //   c705????????6a464000     |     
            //   8935????????         |                     
            //   a3????????           |                     
            //   ff15????????         |                     

        $sequence_4 = { c78568f1ffff00000000 ff15???????? 85c0 7536 8d9564f1ffff 52 8b9570f1ffff }
            // n = 7, score = 100
            //   c78568f1ffff00000000     | mov    dword ptr [ebp - 0xe98], 0
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   7536                 | jne                 0x38
            //   8d9564f1ffff         | lea                 edx, [ebp - 0xe9c]
            //   52                   | push                edx
            //   8b9570f1ffff         | mov                 edx, dword ptr [ebp - 0xe90]

        $sequence_5 = { e8???????? 85c0 7531 8d95f0feffff 52 e8???????? 8b400c }
            // n = 7, score = 100
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   7531                 | jne                 0x33
            //   8d95f0feffff         | lea                 edx, [ebp - 0x110]
            //   52                   | push                edx
            //   e8????????           |                     
            //   8b400c               | mov                 eax, dword ptr [eax + 0xc]

        $sequence_6 = { e8???????? c70009000000 e8???????? ebd1 8bc8 c1f905 8d3c8d80054100 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   c70009000000         | mov                 dword ptr [eax], 9
            //   e8????????           |                     
            //   ebd1                 | jmp                 0xffffffd3
            //   8bc8                 | mov                 ecx, eax
            //   c1f905               | sar                 ecx, 5
            //   8d3c8d80054100       | lea                 edi, [ecx*4 + 0x410580]

        $sequence_7 = { 57 ffd3 85c0 75b3 }
            // n = 4, score = 100
            //   57                   | push                edi
            //   ffd3                 | call                ebx
            //   85c0                 | test                eax, eax
            //   75b3                 | jne                 0xffffffb5

        $sequence_8 = { 8d642400 33c0 68ce070000 50 8d8d2ef8ffff }
            // n = 5, score = 100
            //   8d642400             | lea                 esp, [esp]
            //   33c0                 | xor                 eax, eax
            //   68ce070000           | push                0x7ce
            //   50                   | push                eax
            //   8d8d2ef8ffff         | lea                 ecx, [ebp - 0x7d2]

        $sequence_9 = { 7463 6a00 6a02 8d85e4efffff }
            // n = 4, score = 100
            //   7463                 | je                  0x65
            //   6a00                 | push                0
            //   6a02                 | push                2
            //   8d85e4efffff         | lea                 eax, [ebp - 0x101c]

        $sequence_10 = { 751d 8d04f500ed4000 8938 68a00f0000 ff30 }
            // n = 5, score = 100
            //   751d                 | jne                 0x1f
            //   8d04f500ed4000       | lea                 eax, [esi*8 + 0x40ed00]
            //   8938                 | mov                 dword ptr [eax], edi
            //   68a00f0000           | push                0xfa0
            //   ff30                 | push                dword ptr [eax]

        $sequence_11 = { 8d9520f8ffff 52 e8???????? 83c408 85c0 744a 56 }
            // n = 7, score = 100
            //   8d9520f8ffff         | lea                 edx, [ebp - 0x7e0]
            //   52                   | push                edx
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   85c0                 | test                eax, eax
            //   744a                 | je                  0x4c
            //   56                   | push                esi

        $sequence_12 = { 741a 8b8d08f8ffff 51 8d9520f8ffff 52 e8???????? }
            // n = 6, score = 100
            //   741a                 | je                  0x1c
            //   8b8d08f8ffff         | mov                 ecx, dword ptr [ebp - 0x7f8]
            //   51                   | push                ecx
            //   8d9520f8ffff         | lea                 edx, [ebp - 0x7e0]
            //   52                   | push                edx
            //   e8????????           |                     

        $sequence_13 = { 8b8d18f8ffff e9???????? c3 8b542408 8d420c 8b8af8f7ffff 33c8 }
            // n = 7, score = 100
            //   8b8d18f8ffff         | mov                 ecx, dword ptr [ebp - 0x7e8]
            //   e9????????           |                     
            //   c3                   | ret                 
            //   8b542408             | mov                 edx, dword ptr [esp + 8]
            //   8d420c               | lea                 eax, [edx + 0xc]
            //   8b8af8f7ffff         | mov                 ecx, dword ptr [edx - 0x808]
            //   33c8                 | xor                 ecx, eax

    condition:
        7 of them and filesize < 454656
}