rule win_nightclub_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        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 = "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 = { 8b8578ffffff 895dc4 895dc0 c745b4dc440110 89bd70ffffff 3bc3 740a }
            // n = 7, score = 100
            //   8b8578ffffff         | mov                 eax, dword ptr [ebp - 0x88]
            //   895dc4               | mov                 dword ptr [ebp - 0x3c], ebx
            //   895dc0               | mov                 dword ptr [ebp - 0x40], ebx
            //   c745b4dc440110       | mov                 dword ptr [ebp - 0x4c], 0x100144dc
            //   89bd70ffffff         | mov                 dword ptr [ebp - 0x90], edi
            //   3bc3                 | cmp                 eax, ebx
            //   740a                 | je                  0xc

        $sequence_1 = { 8b06 8b5008 68???????? ffd2 6a78 }
            // n = 5, score = 100
            //   8b06                 | mov                 eax, dword ptr [esi]
            //   8b5008               | mov                 edx, dword ptr [eax + 8]
            //   68????????           |                     
            //   ffd2                 | call                edx
            //   6a78                 | push                0x78

        $sequence_2 = { ff15???????? 68???????? e8???????? 83c404 56 68???????? b9???????? }
            // n = 7, score = 100
            //   ff15????????         |                     
            //   68????????           |                     
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   56                   | push                esi
            //   68????????           |                     
            //   b9????????           |                     

        $sequence_3 = { ffd3 8b8d08fcffff 51 ffd3 8b950cfcffff 52 ffd3 }
            // n = 7, score = 100
            //   ffd3                 | call                ebx
            //   8b8d08fcffff         | mov                 ecx, dword ptr [ebp - 0x3f8]
            //   51                   | push                ecx
            //   ffd3                 | call                ebx
            //   8b950cfcffff         | mov                 edx, dword ptr [ebp - 0x3f4]
            //   52                   | push                edx
            //   ffd3                 | call                ebx

        $sequence_4 = { f7d9 0bc8 51 ff15???????? 8bd8 8b4608 }
            // n = 6, score = 100
            //   f7d9                 | neg                 ecx
            //   0bc8                 | or                  ecx, eax
            //   51                   | push                ecx
            //   ff15????????         |                     
            //   8bd8                 | mov                 ebx, eax
            //   8b4608               | mov                 eax, dword ptr [esi + 8]

        $sequence_5 = { 33c0 668903 8b16 8b4204 83c404 53 8bce }
            // n = 7, score = 100
            //   33c0                 | xor                 eax, eax
            //   668903               | mov                 word ptr [ebx], ax
            //   8b16                 | mov                 edx, dword ptr [esi]
            //   8b4204               | mov                 eax, dword ptr [edx + 4]
            //   83c404               | add                 esp, 4
            //   53                   | push                ebx
            //   8bce                 | mov                 ecx, esi

        $sequence_6 = { ebf3 c6043000 89850cfcffff 8bbdccfbffff 85ff 0f8489080000 }
            // n = 6, score = 100
            //   ebf3                 | jmp                 0xfffffff5
            //   c6043000             | mov                 byte ptr [eax + esi], 0
            //   89850cfcffff         | mov                 dword ptr [ebp - 0x3f4], eax
            //   8bbdccfbffff         | mov                 edi, dword ptr [ebp - 0x434]
            //   85ff                 | test                edi, edi
            //   0f8489080000         | je                  0x88f

        $sequence_7 = { 384dfa 0f94c0 83c00a 8b4dfc 33cd e8???????? 8be5 }
            // n = 7, score = 100
            //   384dfa               | cmp                 byte ptr [ebp - 6], cl
            //   0f94c0               | sete                al
            //   83c00a               | add                 eax, 0xa
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]
            //   33cd                 | xor                 ecx, ebp
            //   e8????????           |                     
            //   8be5                 | mov                 esp, ebp

        $sequence_8 = { 0bc8 51 ff15???????? 8bf0 c70600000000 8b07 }
            // n = 6, score = 100
            //   0bc8                 | or                  ecx, eax
            //   51                   | push                ecx
            //   ff15????????         |                     
            //   8bf0                 | mov                 esi, eax
            //   c70600000000         | mov                 dword ptr [esi], 0
            //   8b07                 | mov                 eax, dword ptr [edi]

        $sequence_9 = { c1e81f 03c2 8945f0 83f801 7707 c745f001000000 }
            // n = 6, score = 100
            //   c1e81f               | shr                 eax, 0x1f
            //   03c2                 | add                 eax, edx
            //   8945f0               | mov                 dword ptr [ebp - 0x10], eax
            //   83f801               | cmp                 eax, 1
            //   7707                 | ja                  9
            //   c745f001000000       | mov                 dword ptr [ebp - 0x10], 1

    condition:
        7 of them and filesize < 247808
}