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rule win_mikoponi_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "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 = { 83c40c 6a00 c744245042000000 897c2454 ff15???????? } // n = 5, score = 100 // 83c40c | add esp, 0xc // 6a00 | push 0 // c744245042000000 | mov dword ptr [esp + 0x50], 0x42 // 897c2454 | mov dword ptr [esp + 0x54], edi // ff15???????? | $sequence_1 = { e9???????? 8975e4 33c0 39b8f85a4200 0f8491000000 ff45e4 83c030 } // n = 7, score = 100 // e9???????? | // 8975e4 | mov dword ptr [ebp - 0x1c], esi // 33c0 | xor eax, eax // 39b8f85a4200 | cmp dword ptr [eax + 0x425af8], edi // 0f8491000000 | je 0x97 // ff45e4 | inc dword ptr [ebp - 0x1c] // 83c030 | add eax, 0x30 $sequence_2 = { ffd7 8bf8 83ffff 753f 803d????????00 751d 56 } // n = 7, score = 100 // ffd7 | call edi // 8bf8 | mov edi, eax // 83ffff | cmp edi, -1 // 753f | jne 0x41 // 803d????????00 | // 751d | jne 0x1f // 56 | push esi $sequence_3 = { 8d842488060000 68???????? 50 e8???????? 83c41c 8b2d???????? 8d4c2414 } // n = 7, score = 100 // 8d842488060000 | lea eax, [esp + 0x688] // 68???????? | // 50 | push eax // e8???????? | // 83c41c | add esp, 0x1c // 8b2d???????? | // 8d4c2414 | lea ecx, [esp + 0x14] $sequence_4 = { 803d????????00 0f84ea000000 33f6 c744241c00100000 89742420 } // n = 5, score = 100 // 803d????????00 | // 0f84ea000000 | je 0xf0 // 33f6 | xor esi, esi // c744241c00100000 | mov dword ptr [esp + 0x1c], 0x1000 // 89742420 | mov dword ptr [esp + 0x20], esi $sequence_5 = { 68???????? c744240800000000 e8???????? 68???????? e8???????? 68???????? e8???????? } // n = 7, score = 100 // 68???????? | // c744240800000000 | mov dword ptr [esp + 8], 0 // e8???????? | // 68???????? | // e8???????? | // 68???????? | // e8???????? | $sequence_6 = { 51 68???????? e8???????? 83c40c 381d???????? 752d } // n = 6, score = 100 // 51 | push ecx // 68???????? | // e8???????? | // 83c40c | add esp, 0xc // 381d???????? | // 752d | jne 0x2f $sequence_7 = { 53 e8???????? 6a00 8d4c2424 51 50 } // n = 6, score = 100 // 53 | push ebx // e8???????? | // 6a00 | push 0 // 8d4c2424 | lea ecx, [esp + 0x24] // 51 | push ecx // 50 | push eax condition: 7 of them and filesize < 330752 }
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