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 = "2023-03-28" 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 = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { 488b11 ff5210 8bc6 eb27 4c8d4f10 4c8d4720 } // n = 6, score = 200 // 488b11 | cmp dword ptr [esp + 0x30], edi // ff5210 | je 0x1110 // 8bc6 | dec esp // eb27 | lea eax, [0xfffe5bc8] // 4c8d4f10 | dec ebx // 4c8d4720 | mov eax, dword ptr [eax + esi*8 + 0x77ae0] $sequence_1 = { 483bc1 72f0 0fba65180d 7351 eb4c 4533c0 488bd6 } // n = 7, score = 200 // 483bc1 | dec eax // 72f0 | add ecx, edx // 0fba65180d | jmp ecx // 7351 | inc esp // eb4c | cmp dword ptr [edi + 0x10], esi // 4533c0 | jne 0x23cb // 488bd6 | mov edx, dword ptr [ebx + 0x108] $sequence_2 = { 4c8be0 e9???????? 4b8b8cf0e07a0700 4c8d4c2430 488d9424b0000000 488b0c31 41b801000000 } // n = 7, score = 200 // 4c8be0 | dec eax // e9???????? | // 4b8b8cf0e07a0700 | sub esp, 0x50 // 4c8d4c2430 | dec eax // 488d9424b0000000 | xor eax, esp // 488b0c31 | dec eax // 41b801000000 | mov dword ptr [esp + 0x48], eax $sequence_3 = { 4885db 0f845e040000 4885c0 0f846d040000 ba08000000 e9???????? } // n = 6, score = 200 // 4885db | cmp ecx, 1 // 0f845e040000 | jne 0x740 // 4885c0 | dec eax // 0f846d040000 | arpl word ptr [ebx + 8], ax // ba08000000 | dec eax // e9???????? | $sequence_4 = { 4c8d7e08 498bcf 0f1f440000 0fb601 8803 48ffc1 48ffc3 } // n = 7, score = 200 // 4c8d7e08 | dec eax // 498bcf | test edx, edx // 0f1f440000 | jne 0xe0b // 0fb601 | xor eax, eax // 8803 | dec eax // 48ffc1 | test ecx, ecx // 48ffc3 | dec eax $sequence_5 = { 90 488b4c2440 483bcf 7407 488b01 ff5010 90 } // n = 7, score = 200 // 90 | mov edi, dword ptr [esp + 0x48] // 488b4c2440 | dec eax // 483bcf | add esp, 0x20 // 7407 | inc ecx // 488b01 | pop esp // ff5010 | ret // 90 | dec eax $sequence_6 = { 48896c2410 4889742418 57 4883ec20 498be9 488bf9 4d85c9 } // n = 7, score = 200 // 48896c2410 | dec esp // 4889742418 | mov ebx, dword ptr [ebp] // 57 | dec esp // 4883ec20 | mov ecx, dword ptr [esp + 0x88] // 498be9 | dec eax // 488bf9 | mov dword ptr [esp + 0x30], eax // 4d85c9 | dec eax $sequence_7 = { 4154 4881ec40010000 488b05???????? 4833c4 4889842430010000 33db 418be8 } // n = 7, score = 200 // 4154 | mov eax, 0x18 // 4881ec40010000 | dec eax // 488b05???????? | // 4833c4 | lea edx, [0x59e17] // 4889842430010000 | dec eax // 33db | lea ecx, [esp + 0x78] // 418be8 | jne 0x18aa $sequence_8 = { 488b4c2430 48890a 418bc7 eb19 488d15dc5f0400 488944da08 b907000000 } // n = 7, score = 200 // 488b4c2430 | inc ebp // 48890a | xor ecx, ecx // 418bc7 | inc ebp // eb19 | xor eax, eax // 488d15dc5f0400 | mov edx, 0x364 // 488944da08 | jne 0x898 // b907000000 | inc ebp $sequence_9 = { 7451 488d1568db0300 488bcb e8???????? 85c0 751e 8b4f24 } // n = 7, score = 200 // 7451 | dec ecx // 488d1568db0300 | mov edi, ecx // 488bcb | inc ecx // e8???????? | // 85c0 | mov esi, eax // 751e | dec eax // 8b4f24 | mov ebx, ecx condition: 7 of them and filesize < 1107968 }
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