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rule win_mulcom_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" 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 = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { 4883ec40 33ff 48c740f007000000 488978e8 488d4c2420 668978d8 4d85c0 } // n = 7, score = 100 // 4883ec40 | mov ecx, eax // 33ff | dec ebp // 48c740f007000000 | sub ecx, eax // 488978e8 | dec ecx // 488d4c2420 | sub ecx, 0x210 // 668978d8 | dec ecx // 4d85c0 | add eax, 0x210 $sequence_1 = { e8???????? 4c8b4310 488bd3 48837b1808 7203 488b13 4981f804010000 } // n = 7, score = 100 // e8???????? | // 4c8b4310 | dec eax // 488bd3 | test ecx, ecx // 48837b1808 | je 0x149d // 7203 | dec eax // 488b13 | mov eax, dword ptr [ecx] // 4981f804010000 | dec eax $sequence_2 = { e8???????? 488d4de8 e8???????? 488d4dc8 e8???????? 488d4da8 e8???????? } // n = 7, score = 100 // e8???????? | // 488d4de8 | dec eax // e8???????? | // 488d4dc8 | lea edx, [ebp - 0x41] // e8???????? | // 488d4da8 | dec eax // e8???????? | $sequence_3 = { 48897020 488b05???????? 4833c4 48898510020000 498bf8 488bda 4889542438 } // n = 7, score = 100 // 48897020 | xor edx, edx // 488b05???????? | // 4833c4 | dec eax // 48898510020000 | lea ecx, [ebp + 0x10] // 498bf8 | mov dword ptr [ebp - 0x3d], eax // 488bda | inc esp // 4889542438 | mov dword ptr [ebp - 0x39], esp $sequence_4 = { 33d2 33c9 458bc6 ff15???????? 85c0 0f8412020000 } // n = 6, score = 100 // 33d2 | dec eax // 33c9 | inc edx // 458bc6 | dec eax // ff15???????? | // 85c0 | mov ecx, dword ptr [ebp - 0x28] // 0f8412020000 | dec eax $sequence_5 = { e8???????? 488d4c2460 e8???????? 90 488dbea0000000 488d9580010000 } // n = 6, score = 100 // e8???????? | // 488d4c2460 | dec eax // e8???????? | // 90 | mov dword ptr [edx + 8], eax // 488dbea0000000 | dec eax // 488d9580010000 | lea eax, [0x3a6a9] $sequence_6 = { 4c897de0 488d45d0 48837de810 480f4345d0 448838 8b542440 483b55e0 } // n = 7, score = 100 // 4c897de0 | dec esp // 488d45d0 | mov dword ptr [esp + 0x80], esi // 48837de810 | xor edi, edi // 480f4345d0 | dec eax // 448838 | mov dword ptr [esp + 0x88], edi // 8b542440 | dec esp // 483b55e0 | imul ebp, ebx, 0xa8 $sequence_7 = { 4d63df 4c015d00 478d6c2fff eb3f 4585e4 7511 8b74243c } // n = 7, score = 100 // 4d63df | mov eax, 0xa // 4c015d00 | inc ebx // 478d6c2fff | mov edx, dword ptr [esp + edi*8] // eb3f | dec eax // 4585e4 | lea ecx, [ebp] // 7511 | dec eax // 8b74243c | mov ebx, eax $sequence_8 = { cc e8???????? cc 4c8bc2 488b5108 48395110 0f848b000000 } // n = 7, score = 100 // cc | dec eax // e8???????? | // cc | arpl word ptr [eax + 4], cx // 4c8bc2 | dec eax // 488b5108 | lea eax, [0x4e23e] // 48395110 | dec edx // 0f848b000000 | mov dword ptr [ecx + esi], eax $sequence_9 = { 410fb7d0 ff5018 440fb7c0 49ffce 418bff 66453be0 0f45fb } // n = 7, score = 100 // 410fb7d0 | add al, al // ff5018 | inc al // 440fb7c0 | mov byte ptr [ecx], al // 49ffce | jmp 0x69 // 418bff | dec ecx // 66453be0 | mov ecx, dword ptr [eax + 0x10] // 0f45fb | inc eax condition: 7 of them and filesize < 867328 }
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