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rule win_kingminer_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.kingminer." 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.kingminer" 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 = { 5f c7463800000000 8bc6 33cd } // n = 4, score = 100 // 5f | pop edi // c7463800000000 | mov dword ptr [esi + 0x38], 0 // 8bc6 | mov eax, esi // 33cd | xor ecx, ebp $sequence_1 = { c745ec8b45fc8b c745f0cf8b7050 66c745f48bd6 e8???????? } // n = 4, score = 100 // c745ec8b45fc8b | mov dword ptr [ebp - 0x14], 0x8bfc458b // c745f0cf8b7050 | mov dword ptr [ebp - 0x10], 0x50708bcf // 66c745f48bd6 | mov word ptr [ebp - 0xc], 0xd68b // e8???????? | $sequence_2 = { 03348540090110 8b45f8 8b00 8906 8b45fc 8a00 884604 } // n = 7, score = 100 // 03348540090110 | add esi, dword ptr [eax*4 + 0x10010940] // 8b45f8 | mov eax, dword ptr [ebp - 8] // 8b00 | mov eax, dword ptr [eax] // 8906 | mov dword ptr [esi], eax // 8b45fc | mov eax, dword ptr [ebp - 4] // 8a00 | mov al, byte ptr [eax] // 884604 | mov byte ptr [esi + 4], al $sequence_3 = { 57 52 ff15???????? 57 ff15???????? a1???????? } // n = 6, score = 100 // 57 | push edi // 52 | push edx // ff15???????? | // 57 | push edi // ff15???????? | // a1???????? | $sequence_4 = { 8bc7 c745f033ff8b56 c745f4208bcbe8 e8???????? 83c408 } // n = 5, score = 100 // 8bc7 | mov eax, edi // c745f033ff8b56 | mov dword ptr [ebp - 0x10], 0x568bff33 // c745f4208bcbe8 | mov dword ptr [ebp - 0xc], 0xe8cb8b20 // e8???????? | // 83c408 | add esp, 8 $sequence_5 = { 3bf0 741e 68c1000000 ff15???????? 5b } // n = 5, score = 100 // 3bf0 | cmp esi, eax // 741e | je 0x20 // 68c1000000 | push 0xc1 // ff15???????? | // 5b | pop ebx $sequence_6 = { 68???????? ff15???????? 8b7508 c7465c88d00010 } // n = 4, score = 100 // 68???????? | // ff15???????? | // 8b7508 | mov esi, dword ptr [ebp + 8] // c7465c88d00010 | mov dword ptr [esi + 0x5c], 0x1000d088 $sequence_7 = { 6a01 ff15???????? 6a00 ff15???????? 8b17 } // n = 5, score = 100 // 6a01 | push 1 // ff15???????? | // 6a00 | push 0 // ff15???????? | // 8b17 | mov edx, dword ptr [edi] $sequence_8 = { 8b7508 8d34f518f20010 391e 7404 8bc7 } // n = 5, score = 100 // 8b7508 | mov esi, dword ptr [ebp + 8] // 8d34f518f20010 | lea esi, [esi*8 + 0x1000f218] // 391e | cmp dword ptr [esi], ebx // 7404 | je 6 // 8bc7 | mov eax, edi $sequence_9 = { 57 ff15???????? 6a00 57 ff15???????? 8bf0 a1???????? } // n = 7, score = 100 // 57 | push edi // ff15???????? | // 6a00 | push 0 // 57 | push edi // ff15???????? | // 8bf0 | mov esi, eax // a1???????? | condition: 7 of them and filesize < 165888 }
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