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rule win_spyder_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" 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 = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { 488d3da8a20000 eb0e 488b03 4885c0 7402 ffd0 4883c308 } // n = 7, score = 500 // 488d3da8a20000 | dec eax // eb0e | lea edi, [0xa2a8] // 488b03 | jmp 0x10 // 4885c0 | dec eax // 7402 | mov eax, dword ptr [ebx] // ffd0 | dec eax // 4883c308 | test eax, eax $sequence_1 = { 4c8d05928a0000 8bd7 498bcd e8???????? 85c0 7415 4533c9 } // n = 7, score = 500 // 4c8d05928a0000 | arpl word ptr [esp + 0x3c], si // 8bd7 | dec ecx // 498bcd | add esi, esp // e8???????? | // 85c0 | cmp dword ptr [esi], 0x4550 // 7415 | test eax, eax // 4533c9 | jne 0x1e $sequence_2 = { 0f8493010000 488d156a5f0000 488bc8 ff15???????? 4885c0 } // n = 5, score = 500 // 0f8493010000 | dec eax // 488d156a5f0000 | lea edx, [0x8988] // 488bc8 | inc ecx // ff15???????? | // 4885c0 | mov eax, 0x12010 $sequence_3 = { 488b03 4885c0 7437 482bfb 0f1f8000000000 4c8b4638 498bcc } // n = 7, score = 500 // 488b03 | mov edx, edi // 4885c0 | dec ecx // 7437 | mov ecx, ebp // 482bfb | test eax, eax // 0f1f8000000000 | je 0x25 // 4c8b4638 | inc ebp // 498bcc | xor ecx, ecx $sequence_4 = { e8???????? 85c0 751a 488d1588890000 41b810200100 488bcd e8???????? } // n = 7, score = 500 // e8???????? | // 85c0 | dec ecx // 751a | mov edx, esp // 488d1588890000 | je 0xd // 41b810200100 | mov ecx, 0xc1 // 488bcd | dec ecx // e8???????? | $sequence_5 = { 0f85d5000000 488d0d935f0000 ff15???????? 488bf0 4885c0 } // n = 5, score = 500 // 0f85d5000000 | dec eax // 488d0d935f0000 | mov ecx, ebp // ff15???????? | // 488bf0 | dec esp // 4885c0 | lea eax, [0x8a92] $sequence_6 = { 740b b9c1000000 ff15???????? 496374243c 4903f4 813e50450000 } // n = 6, score = 500 // 740b | dec eax // b9c1000000 | mov dword ptr [esp + 0x20], esi // ff15???????? | // 496374243c | int3 // 4903f4 | dec esp // 813e50450000 | lea eax, [0x89fc] $sequence_7 = { 33d2 33c9 4889742420 e8???????? cc 4c8d05fc890000 498bd4 } // n = 7, score = 500 // 33d2 | je 4 // 33c9 | call eax // 4889742420 | dec eax // e8???????? | // cc | add ebx, 8 // 4c8d05fc890000 | xor edx, edx // 498bd4 | xor ecx, ecx $sequence_8 = { f7d8 83da00 5b c21000 8b542404 } // n = 5, score = 100 // f7d8 | test eax, eax // 83da00 | jne 0xdb // 5b | dec eax // c21000 | lea ecx, [0x5f93] // 8b542404 | dec eax $sequence_9 = { 8b4d0c 8a01 4a 0fb6f0 f686014a091004 } // n = 5, score = 100 // 8b4d0c | inc ebp // 8a01 | test edx, edx // 4a | jne 0x3c // 0fb6f0 | dec eax // f686014a091004 | lea ecx, [ebx + 4] $sequence_10 = { 53 52 8d8424900d0000 57 50 } // n = 5, score = 100 // 53 | test eax, eax // 52 | neg eax // 8d8424900d0000 | sbb edx, 0 // 57 | pop ebx // 50 | ret 0x10 $sequence_11 = { 83e103 50 f3a4 68???????? e8???????? 8b8c2424010000 8b942428010000 } // n = 7, score = 100 // 83e103 | nop dword ptr [eax] // 50 | dec esp // f3a4 | mov eax, dword ptr [esi + 0x38] // 68???????? | // e8???????? | // 8b8c2424010000 | dec ecx // 8b942428010000 | mov ecx, esp $sequence_12 = { 8a9405ecfdffff 889000490910 eb1c f6c202 7410 8088????????20 } // n = 6, score = 100 // 8a9405ecfdffff | mov esi, eax // 889000490910 | dec eax // eb1c | test eax, eax // f6c202 | dec eax // 7410 | mov eax, dword ptr [ebx] // 8088????????20 | $sequence_13 = { 0fb6fa 3bc7 7714 8b55fc 8a92783d0910 0890014a0910 40 } // n = 7, score = 100 // 0fb6fa | mov edx, dword ptr [esp + 4] // 3bc7 | mov dl, byte ptr [ebp + eax - 0x214] // 7714 | mov byte ptr [eax + 0x10094900], dl // 8b55fc | jmp 0x2b // 8a92783d0910 | test dl, 2 // 0890014a0910 | je 0x24 // 40 | mov byte ptr [esp + 0x188], bl $sequence_14 = { 889c2488010000 f3ab 8b8c248c150000 8d942488010000 66ab } // n = 5, score = 100 // 889c2488010000 | dec eax // f3ab | test eax, eax // 8b8c248c150000 | je 0x3f // 8d942488010000 | dec eax // 66ab | sub edi, ebx $sequence_15 = { e8???????? 83c408 8bf0 8d942488010000 46 } // n = 5, score = 100 // e8???????? | // 83c408 | dec esp // 8bf0 | lea eax, [0x3e17] // 8d942488010000 | inc ecx // 46 | lea edx, [edx + 0x16] condition: 7 of them and filesize < 1458176 }
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