Actor(s): BlackTech
There is no description at this point.
rule win_spider_rat_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.spider_rat." 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.spider_rat" malpedia_rule_date = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { e9???????? 4883c708 488b1f 488bd3 488d8c2490000000 e8???????? } // n = 6, score = 200 // e9???????? | // 4883c708 | cmp al, dl // 488b1f | je 0xa6b // 488bd3 | dec eax // 488d8c2490000000 | mov ecx, edx // e8???????? | $sequence_1 = { 418bc3 4c8d5c2460 498b5b18 498b7328 498be3 5f c3 } // n = 7, score = 200 // 418bc3 | dec eax // 4c8d5c2460 | lea ebp, [ebp + ebp*2] // 498b5b18 | dec esp // 498b7328 | lea ebx, [0x5d63b] // 498be3 | dec eax // 5f | add ebp, ebp // c3 | inc ecx $sequence_2 = { 488b6c2438 488b742440 8958f0 488b07 4863cb 488b5c2430 c6040100 } // n = 7, score = 200 // 488b6c2438 | mov dword ptr [esp + 0x40], 0xf // 488b742440 | dec esp // 8958f0 | mov dword ptr [esp + 0x38], ebp // 488b07 | test edi, edi // 4863cb | js 0x1476 // 488b5c2430 | dec eax // c6040100 | mov ecx, dword ptr [esp + 0xe0] $sequence_3 = { e8???????? 488b4d70 4883c160 ff15???????? 90 488d05b726fbff eb00 } // n = 7, score = 200 // e8???????? | // 488b4d70 | mov eax, 0x80070057 // 4883c160 | jmp 0x90 // ff15???????? | // 90 | dec eax // 488d05b726fbff | mov eax, dword ptr [ecx] // eb00 | dec eax $sequence_4 = { 84c0 7471 4885f6 7505 83fd01 7415 488b8f88000000 } // n = 7, score = 200 // 84c0 | nop word ptr [eax + eax] // 7471 | dec eax // 4885f6 | lea ecx, [edi + ebx] // 7505 | inc ecx // 83fd01 | mov eax, 0x19000 // 7415 | dec eax // 488b8f88000000 | mov edx, ebx $sequence_5 = { 7458 6683fa01 7452 ff15???????? 4c8bc6 8bd5 0fb7cb } // n = 7, score = 200 // 7458 | mov edx, 1 // 6683fa01 | dec eax // 7452 | arpl ax, bx // ff15???????? | // 4c8bc6 | sub edx, dword ptr [ecx - 8] // 8bd5 | inc esp // 0fb7cb | mov dword ptr [esp + 0x30], esp $sequence_6 = { 7410 488b8f88000000 e8???????? 85c0 7802 33db 8bc3 } // n = 7, score = 200 // 7410 | movzx eax, bx // 488b8f88000000 | inc esp // e8???????? | // 85c0 | mov dword ptr [ebp + 4], ebx // 7802 | inc esp // 33db | mov dword ptr [ebp + 8], ebx // 8bc3 | inc esp $sequence_7 = { 498bd8 488bf2 488bf9 4d85c0 7430 4885d2 742b } // n = 7, score = 200 // 498bd8 | dec edx // 488bf2 | mov edx, dword ptr [esi + ebp + 8] // 488bf9 | dec eax // 4d85c0 | mov ecx, edi // 7430 | jne 0x46c // 4885d2 | dec eax // 742b | mov ecx, ebx $sequence_8 = { ff15???????? 488bc8 e8???????? 488d15d3b00300 488bce 488905???????? ff15???????? } // n = 7, score = 200 // ff15???????? | // 488bc8 | sub esp, 0x20 // e8???????? | // 488d15d3b00300 | dec eax // 488bce | lea ebx, [0x5e079] // 488905???????? | // ff15???????? | $sequence_9 = { ba03000000 488d442440 448d4a61 448d42fe 4889442420 e8???????? } // n = 6, score = 200 // ba03000000 | movdqu xmm0, xmmword ptr [eax + ebx + 0x10] // 488d442440 | dec eax // 448d4a61 | mov eax, dword ptr [ebp] // 448d42fe | dec eax // 4889442420 | mov ecx, ebp // e8???????? | condition: 7 of them and filesize < 1107968 }
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