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rule win_kins_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-08-05" version = "1" description = "Detects win.kins." 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.kins" malpedia_rule_date = "20220805" malpedia_hash = "6ec06c64bcfdbeda64eff021c766b4ce34542b71" malpedia_version = "20220808" 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 = { c1c310 03da 315dfc 8b75fc 33f0 0375f4 8db43e0c38e5fd } // n = 7, score = 5000 // c1c310 | rol ebx, 0x10 // 03da | add ebx, edx // 315dfc | xor dword ptr [ebp - 4], ebx // 8b75fc | mov esi, dword ptr [ebp - 4] // 33f0 | xor esi, eax // 0375f4 | add esi, dword ptr [ebp - 0xc] // 8db43e0c38e5fd | lea esi, [esi + edi - 0x21ac7f4] $sequence_1 = { eb21 3c81 727d 3c82 7779 0fb6c0 } // n = 6, score = 5000 // eb21 | jmp 0x23 // 3c81 | cmp al, 0x81 // 727d | jb 0x7f // 3c82 | cmp al, 0x82 // 7779 | ja 0x7b // 0fb6c0 | movzx eax, al $sequence_2 = { 035df0 8d840305e9e3a9 c1c005 03c7 8bdf 33d8 23de } // n = 7, score = 5000 // 035df0 | add ebx, dword ptr [ebp - 0x10] // 8d840305e9e3a9 | lea eax, [ebx + eax - 0x561c16fb] // c1c005 | rol eax, 5 // 03c7 | add eax, edi // 8bdf | mov ebx, edi // 33d8 | xor ebx, eax // 23de | and ebx, esi $sequence_3 = { e8???????? ff7510 50 e8???????? 8bf0 e8???????? 33c0 } // n = 7, score = 5000 // e8???????? | // ff7510 | push dword ptr [ebp + 0x10] // 50 | push eax // e8???????? | // 8bf0 | mov esi, eax // e8???????? | // 33c0 | xor eax, eax $sequence_4 = { 5f 5b c9 c20c00 8b442404 68???????? } // n = 6, score = 5000 // 5f | pop edi // 5b | pop ebx // c9 | leave // c20c00 | ret 0xc // 8b442404 | mov eax, dword ptr [esp + 4] // 68???????? | $sequence_5 = { a5 8d742428 8d7c2438 a5 a5 a5 } // n = 6, score = 5000 // a5 | movsd dword ptr es:[edi], dword ptr [esi] // 8d742428 | lea esi, [esp + 0x28] // 8d7c2438 | lea edi, [esp + 0x38] // a5 | movsd dword ptr es:[edi], dword ptr [esi] // a5 | movsd dword ptr es:[edi], dword ptr [esi] // a5 | movsd dword ptr es:[edi], dword ptr [esi] $sequence_6 = { 7427 8b542418 8b450c e8???????? 84c0 7417 8b54241c } // n = 7, score = 5000 // 7427 | je 0x29 // 8b542418 | mov edx, dword ptr [esp + 0x18] // 8b450c | mov eax, dword ptr [ebp + 0xc] // e8???????? | // 84c0 | test al, al // 7417 | je 0x19 // 8b54241c | mov edx, dword ptr [esp + 0x1c] $sequence_7 = { 894510 e8???????? 83c610 ff4d10 75f3 53 e8???????? } // n = 7, score = 5000 // 894510 | mov dword ptr [ebp + 0x10], eax // e8???????? | // 83c610 | add esi, 0x10 // ff4d10 | dec dword ptr [ebp + 0x10] // 75f3 | jne 0xfffffff5 // 53 | push ebx // e8???????? | $sequence_8 = { a3???????? 3bc3 7510 ff35???????? } // n = 4, score = 5000 // a3???????? | // 3bc3 | cmp eax, ebx // 7510 | jne 0x12 // ff35???????? | $sequence_9 = { 8d9d7cffffff e8???????? 8bf0 85f6 0f85cc010000 8d45cc } // n = 6, score = 5000 // 8d9d7cffffff | lea ebx, [ebp - 0x84] // e8???????? | // 8bf0 | mov esi, eax // 85f6 | test esi, esi // 0f85cc010000 | jne 0x1d2 // 8d45cc | lea eax, [ebp - 0x34] condition: 7 of them and filesize < 548864 }
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