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rule win_kurton_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" 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 = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { 7410 6860ea0000 ffd7 e8???????? 85c0 75f0 } // n = 6, score = 100 // 7410 | je 0x12 // 6860ea0000 | push 0xea60 // ffd7 | call edi // e8???????? | // 85c0 | test eax, eax // 75f0 | jne 0xfffffff2 $sequence_1 = { 51 8bce e8???????? 84c0 0f841c010000 b91f000000 33c0 } // n = 7, score = 100 // 51 | push ecx // 8bce | mov ecx, esi // e8???????? | // 84c0 | test al, al // 0f841c010000 | je 0x122 // b91f000000 | mov ecx, 0x1f // 33c0 | xor eax, eax $sequence_2 = { 8dbc24c5000000 c68424c400000000 f3ab 66ab } // n = 4, score = 100 // 8dbc24c5000000 | lea edi, [esp + 0xc5] // c68424c400000000 | mov byte ptr [esp + 0xc4], 0 // f3ab | rep stosd dword ptr es:[edi], eax // 66ab | stosw word ptr es:[edi], ax $sequence_3 = { 8bce e8???????? b001 5e 83c408 c3 51 } // n = 7, score = 100 // 8bce | mov ecx, esi // e8???????? | // b001 | mov al, 1 // 5e | pop esi // 83c408 | add esp, 8 // c3 | ret // 51 | push ecx $sequence_4 = { ff15???????? 85c0 741d 68e8030000 ff15???????? 8b4e7c } // n = 6, score = 100 // ff15???????? | // 85c0 | test eax, eax // 741d | je 0x1f // 68e8030000 | push 0x3e8 // ff15???????? | // 8b4e7c | mov ecx, dword ptr [esi + 0x7c] $sequence_5 = { ffd7 5f eb59 68???????? 68???????? e8???????? } // n = 6, score = 100 // ffd7 | call edi // 5f | pop edi // eb59 | jmp 0x5b // 68???????? | // 68???????? | // e8???????? | $sequence_6 = { 8954242c c744241c00000000 89542430 8d54241c 52 57 ff15???????? } // n = 7, score = 100 // 8954242c | mov dword ptr [esp + 0x2c], edx // c744241c00000000 | mov dword ptr [esp + 0x1c], 0 // 89542430 | mov dword ptr [esp + 0x30], edx // 8d54241c | lea edx, [esp + 0x1c] // 52 | push edx // 57 | push edi // ff15???????? | $sequence_7 = { 7552 833c85cc58021000 53 57 8d3c85cc580210 bb00100000 7520 } // n = 7, score = 100 // 7552 | jne 0x54 // 833c85cc58021000 | cmp dword ptr [eax*4 + 0x100258cc], 0 // 53 | push ebx // 57 | push edi // 8d3c85cc580210 | lea edi, [eax*4 + 0x100258cc] // bb00100000 | mov ebx, 0x1000 // 7520 | jne 0x22 $sequence_8 = { e8???????? 85c0 741e 8b44241c 53 6a00 68???????? } // n = 7, score = 100 // e8???????? | // 85c0 | test eax, eax // 741e | je 0x20 // 8b44241c | mov eax, dword ptr [esp + 0x1c] // 53 | push ebx // 6a00 | push 0 // 68???????? | $sequence_9 = { 895de0 895ddc 895dfc 897de4 740a 803800 7405 } // n = 7, score = 100 // 895de0 | mov dword ptr [ebp - 0x20], ebx // 895ddc | mov dword ptr [ebp - 0x24], ebx // 895dfc | mov dword ptr [ebp - 4], ebx // 897de4 | mov dword ptr [ebp - 0x1c], edi // 740a | je 0xc // 803800 | cmp byte ptr [eax], 0 // 7405 | je 7 condition: 7 of them and filesize < 344064 }
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