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rule win_kurton_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { e8???????? 84c0 741d 8bcd e8???????? 84c0 } // n = 6, score = 100 // e8???????? | // 84c0 | test al, al // 741d | je 0x1f // 8bcd | mov ecx, ebp // e8???????? | // 84c0 | test al, al $sequence_1 = { 51 6a1f 52 ffd7 8b4e04 8d442408 6a04 } // n = 7, score = 100 // 51 | push ecx // 6a1f | push 0x1f // 52 | push edx // ffd7 | call edi // 8b4e04 | mov ecx, dword ptr [esi + 4] // 8d442408 | lea eax, [esp + 8] // 6a04 | push 4 $sequence_2 = { 8dae84000000 8b567c 57 55 52 8bce e8???????? } // n = 7, score = 100 // 8dae84000000 | lea ebp, [esi + 0x84] // 8b567c | mov edx, dword ptr [esi + 0x7c] // 57 | push edi // 55 | push ebp // 52 | push edx // 8bce | mov ecx, esi // e8???????? | $sequence_3 = { 889c247c050000 e8???????? 8d4c2414 c784247c050000ffffffff e8???????? } // n = 5, score = 100 // 889c247c050000 | mov byte ptr [esp + 0x57c], bl // e8???????? | // 8d4c2414 | lea ecx, [esp + 0x14] // c784247c050000ffffffff | mov dword ptr [esp + 0x57c], 0xffffffff // e8???????? | $sequence_4 = { 83e103 f3a4 8d4c240c e8???????? 8d4c2414 } // n = 5, score = 100 // 83e103 | and ecx, 3 // f3a4 | rep movsb byte ptr es:[edi], byte ptr [esi] // 8d4c240c | lea ecx, [esp + 0xc] // e8???????? | // 8d4c2414 | lea ecx, [esp + 0x14] $sequence_5 = { c745ec02000080 e8???????? 6a64 8d8db8fdffff 57 51 } // n = 6, score = 100 // c745ec02000080 | mov dword ptr [ebp - 0x14], 0x80000002 // e8???????? | // 6a64 | push 0x64 // 8d8db8fdffff | lea ecx, [ebp - 0x248] // 57 | push edi // 51 | push ecx $sequence_6 = { e8???????? 8b0d???????? c644247406 51 53 } // n = 5, score = 100 // e8???????? | // 8b0d???????? | // c644247406 | mov byte ptr [esp + 0x74], 6 // 51 | push ecx // 53 | push ebx $sequence_7 = { f682e15d021004 740c ff01 85f6 7406 8a10 8816 } // n = 7, score = 100 // f682e15d021004 | test byte ptr [edx + 0x10025de1], 4 // 740c | je 0xe // ff01 | inc dword ptr [ecx] // 85f6 | test esi, esi // 7406 | je 8 // 8a10 | mov dl, byte ptr [eax] // 8816 | mov byte ptr [esi], dl $sequence_8 = { 6a00 6a00 ff5228 8b06 } // n = 4, score = 100 // 6a00 | push 0 // 6a00 | push 0 // ff5228 | call dword ptr [edx + 0x28] // 8b06 | mov eax, dword ptr [esi] $sequence_9 = { 8365f800 8365fc00 c745f0aa730010 8965f4 896df8 64a100000000 } // n = 6, score = 100 // 8365f800 | and dword ptr [ebp - 8], 0 // 8365fc00 | and dword ptr [ebp - 4], 0 // c745f0aa730010 | mov dword ptr [ebp - 0x10], 0x100073aa // 8965f4 | mov dword ptr [ebp - 0xc], esp // 896df8 | mov dword ptr [ebp - 8], ebp // 64a100000000 | mov eax, dword ptr fs:[0] condition: 7 of them and filesize < 344064 }
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