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rule win_kurton_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" 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 = "20220405" malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a" malpedia_version = "20220411" 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 = { 66ab 7669 81fe00000200 7605 } // n = 4, score = 100 // 66ab | stosw word ptr es:[edi], ax // 7669 | jbe 0x6b // 81fe00000200 | cmp esi, 0x20000 // 7605 | jbe 7 $sequence_1 = { 84c0 7427 8b542418 8b44241c 8bce } // n = 5, score = 100 // 84c0 | test al, al // 7427 | je 0x29 // 8b542418 | mov edx, dword ptr [esp + 0x18] // 8b44241c | mov eax, dword ptr [esp + 0x1c] // 8bce | mov ecx, esi $sequence_2 = { 6a00 6a00 ff5228 8b06 57 53 8bce } // n = 7, score = 100 // 6a00 | push 0 // 6a00 | push 0 // ff5228 | call dword ptr [edx + 0x28] // 8b06 | mov eax, dword ptr [esi] // 57 | push edi // 53 | push ebx // 8bce | mov ecx, esi $sequence_3 = { 7340 8bce 8bc6 c1f905 83e01f 8b0c8da05b0210 8d04c0 } // n = 7, score = 100 // 7340 | jae 0x42 // 8bce | mov ecx, esi // 8bc6 | mov eax, esi // c1f905 | sar ecx, 5 // 83e01f | and eax, 0x1f // 8b0c8da05b0210 | mov ecx, dword ptr [ecx*4 + 0x10025ba0] // 8d04c0 | lea eax, dword ptr [eax + eax*8] $sequence_4 = { 5e 8b4d08 8bde 80610800 c641052f c641022f } // n = 6, score = 100 // 5e | pop esi // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 8bde | mov ebx, esi // 80610800 | and byte ptr [ecx + 8], 0 // c641052f | mov byte ptr [ecx + 5], 0x2f // c641022f | mov byte ptr [ecx + 2], 0x2f $sequence_5 = { e8???????? 8b15???????? 8d442414 52 6a00 50 8bce } // n = 7, score = 100 // e8???????? | // 8b15???????? | // 8d442414 | lea eax, dword ptr [esp + 0x14] // 52 | push edx // 6a00 | push 0 // 50 | push eax // 8bce | mov ecx, esi $sequence_6 = { c745cce01b0210 e8???????? 8db5b8fdffff 803e00 7422 57 } // n = 6, score = 100 // c745cce01b0210 | mov dword ptr [ebp - 0x34], 0x10021be0 // e8???????? | // 8db5b8fdffff | lea esi, dword ptr [ebp - 0x248] // 803e00 | cmp byte ptr [esi], 0 // 7422 | je 0x24 // 57 | push edi $sequence_7 = { 8bf0 8975e0 85f6 740b 56 ff15???????? 85c0 } // n = 7, score = 100 // 8bf0 | mov esi, eax // 8975e0 | mov dword ptr [ebp - 0x20], esi // 85f6 | test esi, esi // 740b | je 0xd // 56 | push esi // ff15???????? | // 85c0 | test eax, eax $sequence_8 = { 8b4508 ff3485a0270210 ff15???????? 5d } // n = 4, score = 100 // 8b4508 | mov eax, dword ptr [ebp + 8] // ff3485a0270210 | push dword ptr [eax*4 + 0x100227a0] // ff15???????? | // 5d | pop ebp $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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