rule win_nightclub_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.nightclub."
        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.nightclub"
        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 = { 8d4c2420 c644241b00 ff15???????? c744243800000000 8b4d0c 8b7d08 }
            // n = 6, score = 100
            //   8d4c2420             | lea                 ecx, [esp + 0x20]
            //   c644241b00           | mov                 byte ptr [esp + 0x1b], 0
            //   ff15????????         |                     
            //   c744243800000000     | mov                 dword ptr [esp + 0x38], 0
            //   8b4d0c               | mov                 ecx, dword ptr [ebp + 0xc]
            //   8b7d08               | mov                 edi, dword ptr [ebp + 8]

        $sequence_1 = { e8???????? 8d8d88feffff ff15???????? 8d8d20ffffff ff15???????? 8b45c4 85c0 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   8d8d88feffff         | lea                 ecx, [ebp - 0x178]
            //   ff15????????         |                     
            //   8d8d20ffffff         | lea                 ecx, [ebp - 0xe0]
            //   ff15????????         |                     
            //   8b45c4               | mov                 eax, dword ptr [ebp - 0x3c]
            //   85c0                 | test                eax, eax

        $sequence_2 = { 8b4d08 8b510c 83ec08 53 56 }
            // n = 5, score = 100
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   8b510c               | mov                 edx, dword ptr [ecx + 0xc]
            //   83ec08               | sub                 esp, 8
            //   53                   | push                ebx
            //   56                   | push                esi

        $sequence_3 = { c645fc06 ff15???????? 8d4f64 c645fc05 ff15???????? 8d4f54 c645fc04 }
            // n = 7, score = 100
            //   c645fc06             | mov                 byte ptr [ebp - 4], 6
            //   ff15????????         |                     
            //   8d4f64               | lea                 ecx, [edi + 0x64]
            //   c645fc05             | mov                 byte ptr [ebp - 4], 5
            //   ff15????????         |                     
            //   8d4f54               | lea                 ecx, [edi + 0x54]
            //   c645fc04             | mov                 byte ptr [ebp - 4], 4

        $sequence_4 = { ff15???????? 83c404 68???????? 8d953cfeffff c7853cfeffff704e0110 c78558feffff65000000 }
            // n = 6, score = 100
            //   ff15????????         |                     
            //   83c404               | add                 esp, 4
            //   68????????           |                     
            //   8d953cfeffff         | lea                 edx, [ebp - 0x1c4]
            //   c7853cfeffff704e0110     | mov    dword ptr [ebp - 0x1c4], 0x10014e70
            //   c78558feffff65000000     | mov    dword ptr [ebp - 0x1a8], 0x65

        $sequence_5 = { ff15???????? 8bc6 8b4c2430 64890d00000000 59 }
            // n = 5, score = 100
            //   ff15????????         |                     
            //   8bc6                 | mov                 eax, esi
            //   8b4c2430             | mov                 ecx, dword ptr [esp + 0x30]
            //   64890d00000000       | mov                 dword ptr fs:[0], ecx
            //   59                   | pop                 ecx

        $sequence_6 = { 8d957cffffff c645fc04 e8???????? c645fc06 8b45c8 8b3d???????? bb???????? }
            // n = 7, score = 100
            //   8d957cffffff         | lea                 edx, [ebp - 0x84]
            //   c645fc04             | mov                 byte ptr [ebp - 4], 4
            //   e8????????           |                     
            //   c645fc06             | mov                 byte ptr [ebp - 4], 6
            //   8b45c8               | mov                 eax, dword ptr [ebp - 0x38]
            //   8b3d????????         |                     
            //   bb????????           |                     

        $sequence_7 = { 6a01 6a02 8d8d20ffffff c745fc03000000 ff15???????? 8d8d20ffffff 68???????? }
            // n = 7, score = 100
            //   6a01                 | push                1
            //   6a02                 | push                2
            //   8d8d20ffffff         | lea                 ecx, [ebp - 0xe0]
            //   c745fc03000000       | mov                 dword ptr [ebp - 4], 3
            //   ff15????????         |                     
            //   8d8d20ffffff         | lea                 ecx, [ebp - 0xe0]
            //   68????????           |                     

        $sequence_8 = { 33c0 8bff 83b878a7011001 740d 83c014 41 }
            // n = 6, score = 100
            //   33c0                 | xor                 eax, eax
            //   8bff                 | mov                 edi, edi
            //   83b878a7011001       | cmp                 dword ptr [eax + 0x1001a778], 1
            //   740d                 | je                  0xf
            //   83c014               | add                 eax, 0x14
            //   41                   | inc                 ecx

        $sequence_9 = { 42 52 8b5508 52 8d7104 8bc7 }
            // n = 6, score = 100
            //   42                   | inc                 edx
            //   52                   | push                edx
            //   8b5508               | mov                 edx, dword ptr [ebp + 8]
            //   52                   | push                edx
            //   8d7104               | lea                 esi, [ecx + 4]
            //   8bc7                 | mov                 eax, edi

    condition:
        7 of them and filesize < 247808
}