Actor(s): BlackTech
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rule win_spider_rat_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-11-21" 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 = "20221118" malpedia_hash = "e0702e2e6d1d00da65c8a29a4ebacd0a4c59e1af" malpedia_version = "20221125" 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???????? cc 488b4138 488d1c02 4885db 790f 83caff } // n = 7, score = 200 // e8???????? | // cc | jg 0x1099 // 488b4138 | dec eax // 488d1c02 | mov esi, dword ptr [ecx + 0x40] // 4885db | dec eax // 790f | sub esp, 0x30 // 83caff | xor esi, esi $sequence_1 = { 488b5c2450 4883c440 5f c3 e8???????? 488bf8 0fb708 } // n = 7, score = 200 // 488b5c2450 | dec eax // 4883c440 | mov dword ptr [esp + 0x40], eax // 5f | test eax, eax // c3 | jne 0x1554 // e8???????? | // 488bf8 | mov eax, dword ptr [ebp + 0x10] // 0fb708 | dec eax $sequence_2 = { 488b8c2460240300 4833cc e8???????? 4c8d9c2470240300 498b5b28 498b7330 498be3 } // n = 7, score = 200 // 488b8c2460240300 | dec edx // 4833cc | mov dword ptr [ebx + 0x44], ecx // e8???????? | // 4c8d9c2470240300 | dec eax // 498b5b28 | mov eax, ebx // 498b7330 | mov dword ptr [ebx + 0x58], 2 // 498be3 | mov dword ptr [ebx + 0x54], 0x2710 $sequence_3 = { 4c8b8fa8000000 45385938 742a 418bcb 4d395918 764c 4d8b4128 } // n = 7, score = 200 // 4c8b8fa8000000 | inc ecx // 45385938 | pop edi // 742a | call dword ptr [esp + 0x40] // 418bcb | dec eax // 4d395918 | mov ecx, ebp // 764c | mov dword ptr [esp + 0x60], eax // 4d8b4128 | dec eax $sequence_4 = { 0fb701 4883c102 663bc5 75f4 66443921 7506 4883c104 } // n = 7, score = 200 // 0fb701 | dec eax // 4883c102 | mov dword ptr [edi], eax // 663bc5 | dec eax // 75f4 | lea eax, [0x2b1b7] // 66443921 | dec eax // 7506 | mov dword ptr [edi + 8], eax // 4883c104 | dec eax $sequence_5 = { e9???????? 81e982000000 0f8494020000 83e901 0f84f6010000 83e902 0f8452010000 } // n = 7, score = 200 // e9???????? | // 81e982000000 | dec eax // 0f8494020000 | and dword ptr [esp + 0x40], 0 // 83e901 | dec eax // 0f84f6010000 | mov eax, dword ptr [ecx] // 83e902 | call dword ptr [eax + 0x10] // 0f8452010000 | dec eax $sequence_6 = { 740a 488bcf e8???????? eb05 4883670800 488b5c2448 488b742450 } // n = 7, score = 200 // 740a | mov ebx, dword ptr [esp + 0x50] // 488bcf | dec eax // e8???????? | // eb05 | mov ebp, dword ptr [esp + 0x58] // 4883670800 | dec eax // 488b5c2448 | mov esi, dword ptr [esp + 0x60] // 488b742450 | dec eax $sequence_7 = { 33c9 898c2488000000 899c248c000000 4c8b4778 438b440434 89842490000000 898c2494000000 } // n = 7, score = 200 // 33c9 | jl 0x1659 // 898c2488000000 | inc ecx // 899c248c000000 | mov eax, ebp // 4c8b4778 | dec esp // 438b440434 | cmp dword ptr [esp + 0xf0], ebp // 89842490000000 | dec eax // 898c2494000000 | lea edx, [0xffff76ec] $sequence_8 = { 7414 eb2b 498b8510010000 663908 751f 4183cfff eb2c } // n = 7, score = 200 // 7414 | dec eax // eb2b | add esp, 0x28 // 498b8510010000 | ret // 663908 | dec eax // 751f | mov eax, esp // 4183cfff | dec eax // eb2c | mov dword ptr [eax + 8], ebx $sequence_9 = { 4156 4881ecc0010000 48c7442440feffffff 488b05???????? 4833c4 48898424b0010000 4d8be0 } // n = 7, score = 200 // 4156 | mov dword ptr [ecx + eax + 0x20], 8 // 4881ecc0010000 | dec ecx // 48c7442440feffffff | mov eax, dword ptr [esp + 0x20] // 488b05???????? | // 4833c4 | inc ecx // 48898424b0010000 | mov byte ptr [eax + eax], 1 // 4d8be0 | dec ecx condition: 7 of them and filesize < 1107968 }
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