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rule win_mikoponi_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.mikoponi." 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.mikoponi" 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 = { 5f 83c408 c3 8b17 52 e8???????? } // n = 6, score = 100 // 5f | pop edi // 83c408 | add esp, 8 // c3 | ret // 8b17 | mov edx, dword ptr [edi] // 52 | push edx // e8???????? | $sequence_1 = { 83c702 57 b9???????? e8???????? 8d3c47 } // n = 5, score = 100 // 83c702 | add edi, 2 // 57 | push edi // b9???????? | // e8???????? | // 8d3c47 | lea edi, [edi + eax*2] $sequence_2 = { e8???????? 83c404 5e 5b 5d 33c0 5f } // n = 7, score = 100 // e8???????? | // 83c404 | add esp, 4 // 5e | pop esi // 5b | pop ebx // 5d | pop ebp // 33c0 | xor eax, eax // 5f | pop edi $sequence_3 = { e8???????? 59 8945e4 8b7508 c7465cf81d4200 33ff 47 } // n = 7, score = 100 // e8???????? | // 59 | pop ecx // 8945e4 | mov dword ptr [ebp - 0x1c], eax // 8b7508 | mov esi, dword ptr [ebp + 8] // c7465cf81d4200 | mov dword ptr [esi + 0x5c], 0x421df8 // 33ff | xor edi, edi // 47 | inc edi $sequence_4 = { 898424f0010000 898424f4010000 898424f8010000 898424fc010000 89842400020000 } // n = 5, score = 100 // 898424f0010000 | mov dword ptr [esp + 0x1f0], eax // 898424f4010000 | mov dword ptr [esp + 0x1f4], eax // 898424f8010000 | mov dword ptr [esp + 0x1f8], eax // 898424fc010000 | mov dword ptr [esp + 0x1fc], eax // 89842400020000 | mov dword ptr [esp + 0x200], eax $sequence_5 = { 7446 81fe03010000 7446 81fe0d0000c0 0f840f010000 803d????????00 0f8502010000 } // n = 7, score = 100 // 7446 | je 0x48 // 81fe03010000 | cmp esi, 0x103 // 7446 | je 0x48 // 81fe0d0000c0 | cmp esi, 0xc000000d // 0f840f010000 | je 0x115 // 803d????????00 | // 0f8502010000 | jne 0x108 $sequence_6 = { e8???????? 0fb7c0 6685c0 7408 6683f870 7502 } // n = 6, score = 100 // e8???????? | // 0fb7c0 | movzx eax, ax // 6685c0 | test ax, ax // 7408 | je 0xa // 6683f870 | cmp ax, 0x70 // 7502 | jne 4 $sequence_7 = { ff15???????? 85c0 7535 68???????? e8???????? 83c404 } // n = 6, score = 100 // ff15???????? | // 85c0 | test eax, eax // 7535 | jne 0x37 // 68???????? | // e8???????? | // 83c404 | add esp, 4 condition: 7 of them and filesize < 330752 }
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