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rule win_kurton_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.kurton." 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.kurton" malpedia_rule_date = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { 8d9424ac040000 51 52 50 } // n = 4, score = 100 // 8d9424ac040000 | lea edx, [esp + 0x4ac] // 51 | push ecx // 52 | push edx // 50 | push eax $sequence_1 = { 55 68e8030000 ff15???????? 8b467c 8b2d???????? 53 50 } // n = 7, score = 100 // 55 | push ebp // 68e8030000 | push 0x3e8 // ff15???????? | // 8b467c | mov eax, dword ptr [esi + 0x7c] // 8b2d???????? | // 53 | push ebx // 50 | push eax $sequence_2 = { 8bc6 83e61f c1f805 59 8b0485a05b0210 8d0cf6 8064880400 } // n = 7, score = 100 // 8bc6 | mov eax, esi // 83e61f | and esi, 0x1f // c1f805 | sar eax, 5 // 59 | pop ecx // 8b0485a05b0210 | mov eax, dword ptr [eax*4 + 0x10025ba0] // 8d0cf6 | lea ecx, [esi + esi*8] // 8064880400 | and byte ptr [eax + ecx*4 + 4], 0 $sequence_3 = { 33c0 c1e902 f3a5 8bca 8d5570 83e103 f3a4 } // n = 7, score = 100 // 33c0 | xor eax, eax // c1e902 | shr ecx, 2 // f3a5 | rep movsd dword ptr es:[edi], dword ptr [esi] // 8bca | mov ecx, edx // 8d5570 | lea edx, [ebp + 0x70] // 83e103 | and ecx, 3 // f3a4 | rep movsb byte ptr es:[edi], byte ptr [esi] $sequence_4 = { 894508 8bc6 c1f805 8d1c85a05b0210 8bc6 83e01f } // n = 6, score = 100 // 894508 | mov dword ptr [ebp + 8], eax // 8bc6 | mov eax, esi // c1f805 | sar eax, 5 // 8d1c85a05b0210 | lea ebx, [eax*4 + 0x10025ba0] // 8bc6 | mov eax, esi // 83e01f | and eax, 0x1f $sequence_5 = { 8d4c242c 50 57 e8???????? 68???????? e8???????? 83c404 } // n = 7, score = 100 // 8d4c242c | lea ecx, [esp + 0x2c] // 50 | push eax // 57 | push edi // e8???????? | // 68???????? | // e8???????? | // 83c404 | add esp, 4 $sequence_6 = { 668b886aca0110 894a78 33c9 668b8868ca0110 898a84000000 33c9 } // n = 6, score = 100 // 668b886aca0110 | mov cx, word ptr [eax + 0x1001ca6a] // 894a78 | mov dword ptr [edx + 0x78], ecx // 33c9 | xor ecx, ecx // 668b8868ca0110 | mov cx, word ptr [eax + 0x1001ca68] // 898a84000000 | mov dword ptr [edx + 0x84], ecx // 33c9 | xor ecx, ecx $sequence_7 = { 8b0c8da05b0210 f644810401 8d0481 7403 8b00 c3 e8???????? } // n = 7, score = 100 // 8b0c8da05b0210 | mov ecx, dword ptr [ecx*4 + 0x10025ba0] // f644810401 | test byte ptr [ecx + eax*4 + 4], 1 // 8d0481 | lea eax, [ecx + eax*4] // 7403 | je 5 // 8b00 | mov eax, dword ptr [eax] // c3 | ret // e8???????? | $sequence_8 = { 7509 8b0c85802b0210 eb07 8b0c85b42b0210 } // n = 4, score = 100 // 7509 | jne 0xb // 8b0c85802b0210 | mov ecx, dword ptr [eax*4 + 0x10022b80] // eb07 | jmp 9 // 8b0c85b42b0210 | mov ecx, dword ptr [eax*4 + 0x10022bb4] $sequence_9 = { 56 8bf1 57 8b8c24a8080000 68a20f0000 50 51 } // n = 7, score = 100 // 56 | push esi // 8bf1 | mov esi, ecx // 57 | push edi // 8b8c24a8080000 | mov ecx, dword ptr [esp + 0x8a8] // 68a20f0000 | push 0xfa2 // 50 | push eax // 51 | push ecx condition: 7 of them and filesize < 344064 }
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