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rule win_spyder_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" version = "1" description = "Detects win.spyder." 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.spyder" malpedia_rule_date = "20220405" malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a" malpedia_version = "20220411" 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 = { e8???????? 85c0 751a 488d1588890000 41b810200100 488bcd } // n = 6, score = 500 // e8???????? | // 85c0 | sub esp, 0x20 // 751a | dec eax // 488d1588890000 | lea ebx, dword ptr [0x938f] // 41b810200100 | dec eax // 488bcd | lea edi, dword ptr [0x9388] $sequence_1 = { 0f84bb000000 488b5638 498d4c0500 ff5620 4c8be0 4885c0 0f84f3000000 } // n = 7, score = 500 // 0f84bb000000 | jmp 0x1e // 488b5638 | dec eax // 498d4c0500 | lea ecx, dword ptr [0x5f93] // ff5620 | dec eax // 4c8be0 | mov esi, eax // 4885c0 | dec eax // 0f84f3000000 | test eax, eax $sequence_2 = { e8???????? cc 4c8d05fc890000 498bd4 } // n = 4, score = 500 // e8???????? | // cc | dec ecx // 4c8d05fc890000 | mov edx, eax // 498bd4 | dec eax $sequence_3 = { 488d0d935f0000 ff15???????? 488bf0 4885c0 0f8493010000 488d156a5f0000 } // n = 6, score = 500 // 488d0d935f0000 | mov ecx, ecx // ff15???????? | // 488bf0 | test eax, eax // 4885c0 | je 0x29 // 0f8493010000 | dec ebp // 488d156a5f0000 | sub eax, ecx $sequence_4 = { 4883ec20 488d1d8f930000 488d3d88930000 eb0e } // n = 4, score = 500 // 4883ec20 | sub eax, ecx // 488d1d8f930000 | dec esp // 488d3d88930000 | lea ecx, dword ptr [0xffffac82] // eb0e | dec ecx $sequence_5 = { 488b4e30 41b904000000 41b800300000 ff15???????? 488be8 } // n = 5, score = 500 // 488b4e30 | dec eax // 41b904000000 | mov ecx, dword ptr [esi + 0x30] // 41b800300000 | inc ecx // ff15???????? | // 488be8 | mov ecx, 4 $sequence_6 = { cc 488d4b04 4c8d05d83d0000 ba16000000 } // n = 4, score = 500 // cc | je 0x19c // 488d4b04 | dec eax // 4c8d05d83d0000 | lea edx, dword ptr [0x5f6a] // ba16000000 | int3 $sequence_7 = { 4c8d0d82acffff 498bc9 e8???????? 85c0 7422 4d2bc1 } // n = 6, score = 500 // 4c8d0d82acffff | inc ecx // 498bc9 | mov eax, 0x3000 // e8???????? | // 85c0 | dec eax // 7422 | mov ebp, eax // 4d2bc1 | dec esp $sequence_8 = { 83c408 53 e8???????? 83c404 85c0 742a } // n = 6, score = 100 // 83c408 | add esp, 8 // 53 | push ebx // e8???????? | // 83c404 | add esp, 4 // 85c0 | test eax, eax // 742a | je 0x2c $sequence_9 = { 51 53 55 56 8b742414 57 66813e4d5a } // n = 7, score = 100 // 51 | push ecx // 53 | push ebx // 55 | push ebp // 56 | push esi // 8b742414 | mov esi, dword ptr [esp + 0x14] // 57 | push edi // 66813e4d5a | cmp word ptr [esi], 0x5a4d $sequence_10 = { 7520 8b5750 6a04 6800300000 } // n = 4, score = 100 // 7520 | jne 0x22 // 8b5750 | mov edx, dword ptr [edi + 0x50] // 6a04 | push 4 // 6800300000 | push 0x3000 $sequence_11 = { 8bf0 83feff 743f 3bf3 743b 6a02 } // n = 6, score = 100 // 8bf0 | mov esi, eax // 83feff | cmp esi, -1 // 743f | je 0x41 // 3bf3 | cmp esi, ebx // 743b | je 0x3d // 6a02 | push 2 $sequence_12 = { f2ae a1???????? f7d1 49 3bc3 8bf9 741c } // n = 7, score = 100 // f2ae | repne scasb al, byte ptr es:[edi] // a1???????? | // f7d1 | not ecx // 49 | dec ecx // 3bc3 | cmp eax, ebx // 8bf9 | mov edi, ecx // 741c | je 0x1e $sequence_13 = { b8???????? c705????????3b330010 a3???????? c705????????a1330010 c705????????e1320010 c705????????89330010 } // n = 6, score = 100 // b8???????? | // c705????????3b330010 | // a3???????? | // c705????????a1330010 | // c705????????e1320010 | // c705????????89330010 | $sequence_14 = { ba???????? 8bf1 8bc1 c1fe05 83e01f 8b34b5204b0910 } // n = 6, score = 100 // ba???????? | // 8bf1 | mov esi, ecx // 8bc1 | mov eax, ecx // c1fe05 | sar esi, 5 // 83e01f | and eax, 0x1f // 8b34b5204b0910 | mov esi, dword ptr [esi*4 + 0x10094b20] $sequence_15 = { 8b7d0c 8d0540460910 83780800 754e b741 b35a b620 } // n = 7, score = 100 // 8b7d0c | mov edi, dword ptr [ebp + 0xc] // 8d0540460910 | lea eax, dword ptr [0x10094640] // 83780800 | cmp dword ptr [eax + 8], 0 // 754e | jne 0x50 // b741 | mov bh, 0x41 // b35a | mov bl, 0x5a // b620 | mov dh, 0x20 condition: 7 of them and filesize < 1458176 }
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