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rule win_noxplayer_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" version = "1" description = "Detects win.noxplayer." 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.noxplayer" malpedia_rule_date = "20220513" malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26" malpedia_version = "20220516" 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 = { 48c7442420feffffff 48895c2448 488bda 4c8bd1 488b4110 48b96566666666666606 483bc1 } // n = 7, score = 100 // 48c7442420feffffff | mov ebp, dword ptr [esp + 0x20] // 48895c2448 | dec eax // 488bda | add esp, 0x28 // 4c8bd1 | pop esi // 488b4110 | xor al, al // 48b96566666666666606 | test al, al // 483bc1 | inc ecx $sequence_1 = { 488bcf e8???????? 488d0d65390200 e8???????? cc 48ffc0 49894210 } // n = 7, score = 100 // 488bcf | dec eax // e8???????? | // 488d0d65390200 | mov ecx, ebx // e8???????? | // cc | dec eax // 48ffc0 | mov edx, ebx // 49894210 | jmp 0x11f9 $sequence_2 = { 488b0f 80792900 751a 418b01 3b4118 7d08 488bf9 } // n = 7, score = 100 // 488b0f | dec eax // 80792900 | xor eax, esp // 751a | dec eax // 418b01 | mov dword ptr [ebp + 0xf00], eax // 3b4118 | mov eax, 0x814 // 7d08 | cmp word ptr [ebp], ax // 488bf9 | jne 0x7e $sequence_3 = { 4533c9 418d5105 458d4101 488d8da0010000 e8???????? 488d1543650300 488d8da0010000 } // n = 7, score = 100 // 4533c9 | jne 0xd7c // 418d5105 | mov edx, ebp // 458d4101 | dec eax // 488d8da0010000 | lea ecx, [0xf21b] // e8???????? | // 488d1543650300 | cmp bx, word ptr [ecx] // 488d8da0010000 | je 0xd7c $sequence_4 = { 4103c1 4c8b4c2410 c1c90b 4103490c 41894108 418b4110 03c2 } // n = 7, score = 100 // 4103c1 | lea edi, [esp + 0x80] // 4c8b4c2410 | dec eax // c1c90b | lea ebx, [esp + 0x90] // 4103490c | dec esp // 41894108 | lea eax, [esp + 0x20] // 418b4110 | dec ecx // 03c2 | mov edx, esi $sequence_5 = { 48894500 4885c0 7526 8d5003 448d4001 488d4c2440 458bcc } // n = 7, score = 100 // 48894500 | mov dword ptr [ebp - 0x2d], ecx // 4885c0 | test ecx, ecx // 7526 | jg 0x1f86 // 8d5003 | dec eax // 448d4001 | mov ecx, dword ptr [edi + 0x138] // 488d4c2440 | mov dword ptr [ebp - 0x28], ecx // 458bcc | inc esp $sequence_6 = { 4057 4883ec40 4c8d4c2458 4c8d442450 33d2 33c9 } // n = 6, score = 100 // 4057 | dec eax // 4883ec40 | lea eax, [0x8d1f] // 4c8d4c2458 | dec eax // 4c8d442450 | mov ebx, ecx // 33d2 | mov edi, edx // 33c9 | push edi $sequence_7 = { 33d2 33c9 ff15???????? 488905???????? 4883c428 c3 4883ec28 } // n = 7, score = 100 // 33d2 | mov ebx, dword ptr [ebx + 0x200] // 33c9 | dec eax // ff15???????? | // 488905???????? | // 4883c428 | mov edx, dword ptr [ebp - 0x30] // c3 | dec esp // 4883ec28 | add ebx, edx $sequence_8 = { 440f4cc8 44894c2478 8b542470 899618010000 8996f0000000 899600010000 8d4aff } // n = 7, score = 100 // 440f4cc8 | je 0x53e // 44894c2478 | xor eax, eax // 8b542470 | jmp 0x584 // 899618010000 | dec eax // 8996f0000000 | mov eax, dword ptr [esp + 0x30] // 899600010000 | mov ecx, dword ptr [eax + 0x20] // 8d4aff | je 0x54c $sequence_9 = { 415d 415c 5f c3 83f801 7536 4885db } // n = 7, score = 100 // 415d | mov ecx, ebx // 415c | nop // 5f | dec ebp // c3 | mov ecx, eax // 83f801 | dec ebp // 7536 | mov eax, dword ptr [eax] // 4885db | dec eax condition: 7 of them and filesize < 742400 }
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