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rule win_virut_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" version = "1" description = "Detects win.virut." 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.virut" 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 = { 03c3 8b5078 03d3 8b7220 8b4a18 8d3433 51 } // n = 7, score = 200 // 03c3 | add eax, ebx // 8b5078 | mov edx, dword ptr [eax + 0x78] // 03d3 | add edx, ebx // 8b7220 | mov esi, dword ptr [edx + 0x20] // 8b4a18 | mov ecx, dword ptr [edx + 0x18] // 8d3433 | lea esi, [ebx + esi] // 51 | push ecx $sequence_1 = { 75f9 2bc1 8bf8 33f6 85ff 7e2c e8???????? } // n = 7, score = 200 // 75f9 | jne 0xfffffffb // 2bc1 | sub eax, ecx // 8bf8 | mov edi, eax // 33f6 | xor esi, esi // 85ff | test edi, edi // 7e2c | jle 0x2e // e8???????? | $sequence_2 = { 8d8424d0000000 68???????? 50 ff15???????? 83c410 53 } // n = 6, score = 200 // 8d8424d0000000 | lea eax, [esp + 0xd0] // 68???????? | // 50 | push eax // ff15???????? | // 83c410 | add esp, 0x10 // 53 | push ebx $sequence_3 = { 0f85ef000000 885c2420 885c2421 885c2422 885c2423 } // n = 5, score = 200 // 0f85ef000000 | jne 0xf5 // 885c2420 | mov byte ptr [esp + 0x20], bl // 885c2421 | mov byte ptr [esp + 0x21], bl // 885c2422 | mov byte ptr [esp + 0x22], bl // 885c2423 | mov byte ptr [esp + 0x23], bl $sequence_4 = { 8b44241c 6bc00a 0fbec9 47 } // n = 4, score = 200 // 8b44241c | mov eax, dword ptr [esp + 0x1c] // 6bc00a | imul eax, eax, 0xa // 0fbec9 | movsx ecx, cl // 47 | inc edi $sequence_5 = { 6a00 6800000008 6a40 51 52 6a0e 50 } // n = 7, score = 200 // 6a00 | push 0 // 6800000008 | push 0x8000000 // 6a40 | push 0x40 // 51 | push ecx // 52 | push edx // 6a0e | push 0xe // 50 | push eax $sequence_6 = { b928010000 97 2be1 890c24 } // n = 4, score = 200 // b928010000 | mov ecx, 0x128 // 97 | xchg eax, edi // 2be1 | sub esp, ecx // 890c24 | mov dword ptr [esp], ecx $sequence_7 = { aa 3c5c 74ec 3c2e } // n = 4, score = 200 // aa | stosb byte ptr es:[edi], al // 3c5c | cmp al, 0x5c // 74ec | je 0xffffffee // 3c2e | cmp al, 0x2e $sequence_8 = { f7f7 80c261 889434d0010000 46 } // n = 4, score = 200 // f7f7 | div edi // 80c261 | add dl, 0x61 // 889434d0010000 | mov byte ptr [esp + esi + 0x1d0], dl // 46 | inc esi $sequence_9 = { 6a05 8bcc 50 8bd4 50 54 } // n = 6, score = 200 // 6a05 | push 5 // 8bcc | mov ecx, esp // 50 | push eax // 8bd4 | mov edx, esp // 50 | push eax // 54 | push esp $sequence_10 = { 33c0 6a10 59 f3ab 50 50 50 } // n = 7, score = 200 // 33c0 | xor eax, eax // 6a10 | push 0x10 // 59 | pop ecx // f3ab | rep stosd dword ptr es:[edi], eax // 50 | push eax // 50 | push eax // 50 | push eax $sequence_11 = { a3???????? 8d8424e0030000 50 6a02 ff15???????? 895c2414 } // n = 6, score = 200 // a3???????? | // 8d8424e0030000 | lea eax, [esp + 0x3e0] // 50 | push eax // 6a02 | push 2 // ff15???????? | // 895c2414 | mov dword ptr [esp + 0x14], ebx $sequence_12 = { 8d442410 50 6800040000 8d842404060000 50 ff742428 } // n = 6, score = 200 // 8d442410 | lea eax, [esp + 0x10] // 50 | push eax // 6800040000 | push 0x400 // 8d842404060000 | lea eax, [esp + 0x604] // 50 | push eax // ff742428 | push dword ptr [esp + 0x28] $sequence_13 = { 59 f7f1 33f6 8bca 83c107 3bcb } // n = 6, score = 200 // 59 | pop ecx // f7f1 | div ecx // 33f6 | xor esi, esi // 8bca | mov ecx, edx // 83c107 | add ecx, 7 // 3bcb | cmp ecx, ebx $sequence_14 = { 33d2 8bcf 52 f6d9 } // n = 4, score = 200 // 33d2 | xor edx, edx // 8bcf | mov ecx, edi // 52 | push edx // f6d9 | neg cl $sequence_15 = { 57 6a44 58 8d9704010000 ab } // n = 5, score = 200 // 57 | push edi // 6a44 | push 0x44 // 58 | pop eax // 8d9704010000 | lea edx, [edi + 0x104] // ab | stosd dword ptr es:[edi], eax condition: 7 of them and filesize < 98304 }
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