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rule win_mulcom_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.mulcom." 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.mulcom" 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 = { 41ffc5 443b6c2468 7320 8b9c24c8000000 8b542464 4c8bbc24d8000000 4c8b9c24c0000000 } // n = 7, score = 100 // 41ffc5 | mov edx, ebp // 443b6c2468 | dec ecx // 7320 | mov ecx, dword ptr [esi + 0x10] // 8b9c24c8000000 | dec eax // 8b542464 | lea esi, [edx + 1] // 4c8bbc24d8000000 | dec ecx // 4c8b9c24c0000000 | sub ecx, dword ptr [esi] $sequence_1 = { 448bc5 896c2470 4889542420 eb0d 448b942480000000 488b542420 8d8700680100 } // n = 7, score = 100 // 448bc5 | lea eax, [esp + 0x50] // 896c2470 | inc ecx // 4889542420 | mov ecx, 0x218 // eb0d | dec ecx // 448b942480000000 | mov edx, edi // 488b542420 | dec esp // 8d8700680100 | mov ecx, edi $sequence_2 = { ffc9 d222 4d85ff 7422 448b4508 } // n = 5, score = 100 // ffc9 | dec eax // d222 | mov dword ptr [ebp - 0x78], edi // 4d85ff | dec eax // 7422 | mov dword ptr [ebp - 0x70], eax // 448b4508 | mov word ptr [esp + 0x78], di $sequence_3 = { 75e8 8bc7 eb07 1bc0 83e0fe ffc0 85c0 } // n = 7, score = 100 // 75e8 | dec eax // 8bc7 | mov edx, edi // eb07 | dec ebp // 1bc0 | mov eax, esp // 83e0fe | dec ecx // ffc0 | sub edx, esp // 85c0 | dec eax $sequence_4 = { 4883781808 7203 488b00 488d9590000000 488bc8 ff15???????? 4c8be0 } // n = 7, score = 100 // 4883781808 | cmp dword ptr [ecx + 0x18], 0x10 // 7203 | jb 0x1af5 // 488b00 | dec ebp // 488d9590000000 | mov ecx, dword ptr [ecx] // 488bc8 | dec esp // ff15???????? | // 4c8be0 | lea eax, [edi + 0x120] $sequence_5 = { 895320 488903 40887b24 488911 885108 488d15fd600200 e8???????? } // n = 7, score = 100 // 895320 | mov ebp, dword ptr [ebx + 0x10] // 488903 | dec eax // 40887b24 | and dword ptr [esi + 0xe0], 0 // 488911 | dec eax // 885108 | cmp ecx, dword ptr [esi + 0xd8] // 488d15fd600200 | je 0x81 // e8???????? | $sequence_6 = { 4969c4d0000000 4803c7 48894608 488b442420 4803c7 48894610 488b06 } // n = 7, score = 100 // 4969c4d0000000 | dec eax // 4803c7 | add ebx, 0x20 // 48894608 | xor edx, edx // 488b442420 | inc ecx // 4803c7 | mov eax, 0x2d8 // 48894610 | dec eax // 488b06 | lea ecx, [ebp - 0x20] $sequence_7 = { 4885c9 744f 498b4050 486310 4803d1 483bca 7304 } // n = 7, score = 100 // 4885c9 | je 0x3d2 // 744f | cmp esi, 0x7d00 // 498b4050 | jl 0x3c3 // 486310 | inc ecx // 4803d1 | cmp esp, 3 // 483bca | jl 0x3c9 // 7304 | inc ecx $sequence_8 = { 66c745600401 0fb74e58 ff15???????? 66894562 488d0dd9610400 ff15???????? 894564 } // n = 7, score = 100 // 66c745600401 | dec ecx // 0fb74e58 | lea ecx, [edi + 0x80] // ff15???????? | // 66894562 | dec eax // 488d0dd9610400 | mov edx, eax // ff15???????? | // 894564 | inc esp $sequence_9 = { e8???????? 3b470c 753f 4c8b4c2448 8b5710 4c39ca 7732 } // n = 7, score = 100 // e8???????? | // 3b470c | mov dword ptr [esp + 0x20], eax // 753f | dec ecx // 4c8b4c2448 | mov edx, esp // 8b5710 | dec eax // 4c39ca | lea ecx, [ebp + 0x180] // 7732 | inc ecx condition: 7 of them and filesize < 867328 }
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