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rule win_darkmegi_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-12-22" version = "1" description = "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.darkmegi" malpedia_rule_date = "20201222" malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130" malpedia_version = "20201023" 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 = { 8806 46 3bd3 7d0b } // n = 4, score = 100 // 8806 | mov byte ptr [esi], al // 46 | inc esi // 3bd3 | cmp edx, ebx // 7d0b | jge 0xd $sequence_1 = { 50 57 52 56 ff15???????? 5f } // n = 6, score = 100 // 50 | push eax // 57 | push edi // 52 | push edx // 56 | push esi // ff15???????? | // 5f | pop edi $sequence_2 = { 8b4d10 0bc9 0f84e9000000 8b7508 8b7d0c 8d054c93b402 83780800 } // n = 7, score = 100 // 8b4d10 | mov ecx, dword ptr [ebp + 0x10] // 0bc9 | or ecx, ecx // 0f84e9000000 | je 0xef // 8b7508 | mov esi, dword ptr [ebp + 8] // 8b7d0c | mov edi, dword ptr [ebp + 0xc] // 8d054c93b402 | lea eax, [0x2b4934c] // 83780800 | cmp dword ptr [eax + 8], 0 $sequence_3 = { 55 c744242810000000 ff15???????? 83f8ff } // n = 4, score = 100 // 55 | push ebp // c744242810000000 | mov dword ptr [esp + 0x28], 0x10 // ff15???????? | // 83f8ff | cmp eax, -1 $sequence_4 = { 8bc3 c1f805 8d3c8540a7b402 8bc3 83e01f 8d34c0 } // n = 6, score = 100 // 8bc3 | mov eax, ebx // c1f805 | sar eax, 5 // 8d3c8540a7b402 | lea edi, [eax*4 + 0x2b4a740] // 8bc3 | mov eax, ebx // 83e01f | and eax, 0x1f // 8d34c0 | lea esi, [eax + eax*8] $sequence_5 = { 81c474100000 c3 8b842490100000 8d4c2420 } // n = 4, score = 100 // 81c474100000 | add esp, 0x1074 // c3 | ret // 8b842490100000 | mov eax, dword ptr [esp + 0x1090] // 8d4c2420 | lea ecx, [esp + 0x20] $sequence_6 = { 81e1ffff0000 8d1440 8b449430 c6040100 8b442410 } // n = 5, score = 100 // 81e1ffff0000 | and ecx, 0xffff // 8d1440 | lea edx, [eax + eax*2] // 8b449430 | mov eax, dword ptr [esp + edx*4 + 0x30] // c6040100 | mov byte ptr [ecx + eax], 0 // 8b442410 | mov eax, dword ptr [esp + 0x10] $sequence_7 = { 7502 33c0 41 3bcd } // n = 4, score = 100 // 7502 | jne 4 // 33c0 | xor eax, eax // 41 | inc ecx // 3bcd | cmp ecx, ebp $sequence_8 = { 46 8a10 40 0fb6da f6830196b40204 } // n = 5, score = 100 // 46 | inc esi // 8a10 | mov dl, byte ptr [eax] // 40 | inc eax // 0fb6da | movzx ebx, dl // f6830196b40204 | test byte ptr [ebx + 0x2b49601], 4 $sequence_9 = { 3bf8 0f8d43010000 8d4c2414 8d942498030000 51 } // n = 5, score = 100 // 3bf8 | cmp edi, eax // 0f8d43010000 | jge 0x149 // 8d4c2414 | lea ecx, [esp + 0x14] // 8d942498030000 | lea edx, [esp + 0x398] // 51 | push ecx condition: 7 of them and filesize < 90304 }
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