Actor(s): MoustachedBouncer
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rule win_nightclub_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" 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 = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { ff4808 83c404 3b7514 75b4 5f 5b 8b450c } // n = 7, score = 100 // ff4808 | dec dword ptr [eax + 8] // 83c404 | add esp, 4 // 3b7514 | cmp esi, dword ptr [ebp + 0x14] // 75b4 | jne 0xffffffb6 // 5f | pop edi // 5b | pop ebx // 8b450c | mov eax, dword ptr [ebp + 0xc] $sequence_1 = { 8d4dd0 c645f300 ff15???????? 8b4d08 8d45c0 50 51 } // n = 7, score = 100 // 8d4dd0 | lea ecx, [ebp - 0x30] // c645f300 | mov byte ptr [ebp - 0xd], 0 // ff15???????? | // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 8d45c0 | lea eax, [ebp - 0x40] // 50 | push eax // 51 | push ecx $sequence_2 = { 8d75bc e8???????? 8d75e0 e8???????? eb33 8b55bc 8b7d08 } // n = 7, score = 100 // 8d75bc | lea esi, [ebp - 0x44] // e8???????? | // 8d75e0 | lea esi, [ebp - 0x20] // e8???????? | // eb33 | jmp 0x35 // 8b55bc | mov edx, dword ptr [ebp - 0x44] // 8b7d08 | mov edi, dword ptr [ebp + 8] $sequence_3 = { 8da42400000000 8a4701 47 84c0 75f8 b90b000000 be???????? } // n = 7, score = 100 // 8da42400000000 | lea esp, [esp] // 8a4701 | mov al, byte ptr [edi + 1] // 47 | inc edi // 84c0 | test al, al // 75f8 | jne 0xfffffffa // b90b000000 | mov ecx, 0xb // be???????? | $sequence_4 = { 83c404 6a00 56 53 8bf8 ff15???????? } // n = 6, score = 100 // 83c404 | add esp, 4 // 6a00 | push 0 // 56 | push esi // 53 | push ebx // 8bf8 | mov edi, eax // ff15???????? | $sequence_5 = { 85c0 7505 a1???????? 8bc8 8bff 8a10 40 } // n = 7, score = 100 // 85c0 | test eax, eax // 7505 | jne 7 // a1???????? | // 8bc8 | mov ecx, eax // 8bff | mov edi, edi // 8a10 | mov dl, byte ptr [eax] // 40 | inc eax $sequence_6 = { 83c408 8bc8 ff15???????? 5f 5e 8be5 5d } // n = 7, score = 100 // 83c408 | add esp, 8 // 8bc8 | mov ecx, eax // ff15???????? | // 5f | pop edi // 5e | pop esi // 8be5 | mov esp, ebp // 5d | pop ebp $sequence_7 = { 5b b87fe0077e f7ef c1fa08 8bfa c1ef1f 03fa } // n = 7, score = 100 // 5b | pop ebx // b87fe0077e | mov eax, 0x7e07e07f // f7ef | imul edi // c1fa08 | sar edx, 8 // 8bfa | mov edi, edx // c1ef1f | shr edi, 0x1f // 03fa | add edi, edx $sequence_8 = { 8b45f0 83c010 83c310 8945f0 3bc6 75dc } // n = 6, score = 100 // 8b45f0 | mov eax, dword ptr [ebp - 0x10] // 83c010 | add eax, 0x10 // 83c310 | add ebx, 0x10 // 8945f0 | mov dword ptr [ebp - 0x10], eax // 3bc6 | cmp eax, esi // 75dc | jne 0xffffffde $sequence_9 = { c645f200 ff15???????? c745e001000000 85db 0f848c010000 8b15???????? 8b450c } // n = 7, score = 100 // c645f200 | mov byte ptr [ebp - 0xe], 0 // ff15???????? | // c745e001000000 | mov dword ptr [ebp - 0x20], 1 // 85db | test ebx, ebx // 0f848c010000 | je 0x192 // 8b15???????? | // 8b450c | mov eax, dword ptr [ebp + 0xc] condition: 7 of them and filesize < 247808 }
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