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rule win_darkvnc_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.darkvnc." 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.darkvnc" 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 = { 41f6c202 740e 418bc1 d1f8 0fafc6 4898 4d8d0480 } // n = 7, score = 100 // 41f6c202 | dec eax // 740e | cmp dword ptr [esp + 0x20], 0 // 418bc1 | jne 0x1afc // d1f8 | inc ecx // 0fafc6 | mov eax, 0x90 // 4898 | xor edx, edx // 4d8d0480 | dec eax $sequence_1 = { 33c9 4489442428 488d5c2430 4d8bc6 66893b 48895c2420 ff15???????? } // n = 7, score = 100 // 33c9 | dec eax // 4489442428 | mov dword ptr [esp + 0x48], eax // 488d5c2430 | dec eax // 4d8bc6 | mov eax, dword ptr [esp + 0x20] // 66893b | mov eax, dword ptr [eax + 0x18] // 48895c2420 | mov dword ptr [esp + 0x38], eax // ff15???????? | $sequence_2 = { 7514 488b542470 488b442468 488b4810 ff15???????? 488b4c2470 ff15???????? } // n = 7, score = 100 // 7514 | cmp dword ptr [esp + 0x40], -1 // 488b542470 | jne 0x15a4 // 488b442468 | mov dword ptr [esp + 0x40], eax // 488b4810 | dec eax // ff15???????? | // 488b4c2470 | cmp dword ptr [esp + 0x58], -1 // ff15???????? | $sequence_3 = { 8b55fb 8b4df7 ff15???????? 488945c7 4885c0 7454 41b902000000 } // n = 7, score = 100 // 8b55fb | mov eax, dword ptr [ebp + 0x1f0] // 8b4df7 | mov ebx, ecx // ff15???????? | // 488945c7 | dec eax // 4885c0 | test esi, esi // 7454 | je 0x1686 // 41b902000000 | dec eax $sequence_4 = { 48c7c1ffffffff e8???????? 48837c245000 740b 488b4c2450 ff15???????? 8b442420 } // n = 7, score = 100 // 48c7c1ffffffff | dec esp // e8???????? | // 48837c245000 | mov esp, edx // 740b | dec eax // 488b4c2450 | test ecx, ecx // ff15???????? | // 8b442420 | je 0x1bec $sequence_5 = { 745c 488db7c0000000 488bd0 488bce e8???????? 85c0 7446 } // n = 7, score = 100 // 745c | jle 0xbcc // 488db7c0000000 | dec eax // 488bd0 | lea eax, [0x1a22f] // 488bce | inc ecx // e8???????? | // 85c0 | movzx edx, bp // 7446 | dec esp $sequence_6 = { 4883ea01 75d3 4863c6 c6043800 837b1000 7519 488bcf } // n = 7, score = 100 // 4883ea01 | mov eax, dword ptr [esp + 0x78] // 75d3 | dec eax // 4863c6 | mov ecx, dword ptr [esp + 0x38] // c6043800 | dec eax // 837b1000 | mov dword ptr [eax + 0x18], ecx // 7519 | dec eax // 488bcf | mov eax, dword ptr [esp + 0x38] $sequence_7 = { 4889742410 57 4883ec30 833d????????00 488bfa 488bf1 750a } // n = 7, score = 100 // 4889742410 | inc esp // 57 | movzx edx, word ptr [ebx + edx*4] // 4883ec30 | inc esp // 833d????????00 | // 488bfa | cmp edx, ecx // 488bf1 | jae 0x12ce // 750a | inc esp $sequence_8 = { 89542448 4803c8 488d542440 e8???????? 8383d80001000c 8b5720 448bca } // n = 7, score = 100 // 89542448 | mov ebx, 0x5c // 4803c8 | lea eax, [ecx + 1] // 488d542440 | mov word ptr [edi + ecx*2], bx // e8???????? | // 8383d80001000c | dec eax // 8b5720 | lea ecx, [edi + eax*2] // 448bca | mov ecx, dword ptr [esp + 0x4c] $sequence_9 = { 488bce ff15???????? baffff0000 85c0 740a f6459303 7404 } // n = 7, score = 100 // 488bce | dec eax // ff15???????? | // baffff0000 | mov edi, dword ptr [ebx + 0x208] // 85c0 | dec eax // 740a | test edi, edi // f6459303 | je 0x3c7 // 7404 | dec eax condition: 7 of them and filesize < 606208 }
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