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rule win_taidoor_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" version = "1" description = "Detects win.taidoor." 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.taidoor" malpedia_rule_date = "20220513" malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26" malpedia_version = "20220516" 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 = { 33c0 8dbdedecffff 889dececffff f3ab } // n = 4, score = 300 // 33c0 | xor eax, eax // 8dbdedecffff | lea edi, [ebp - 0x1313] // 889dececffff | mov byte ptr [ebp - 0x1314], bl // f3ab | rep stosd dword ptr es:[edi], eax $sequence_1 = { 6a01 33db 5e 8d45e0 } // n = 4, score = 300 // 6a01 | push 1 // 33db | xor ebx, ebx // 5e | pop esi // 8d45e0 | lea eax, [ebp - 0x20] $sequence_2 = { 6880000000 6a02 53 6a02 8d85f4feffff 68000000c0 } // n = 6, score = 300 // 6880000000 | push 0x80 // 6a02 | push 2 // 53 | push ebx // 6a02 | push 2 // 8d85f4feffff | lea eax, [ebp - 0x10c] // 68000000c0 | push 0xc0000000 $sequence_3 = { ff75ec ff15???????? 85c0 740a 8b45dc 2bf0 } // n = 6, score = 300 // ff75ec | push dword ptr [ebp - 0x14] // ff15???????? | // 85c0 | test eax, eax // 740a | je 0xc // 8b45dc | mov eax, dword ptr [ebp - 0x24] // 2bf0 | sub esi, eax $sequence_4 = { 48 0f8472010000 48 48 0f856b030000 } // n = 5, score = 300 // 48 | dec eax // 0f8472010000 | je 0x178 // 48 | dec eax // 48 | dec eax // 0f856b030000 | jne 0x371 $sequence_5 = { 8bf8 8b45fc 40 50 57 e8???????? 8d45a8 } // n = 7, score = 300 // 8bf8 | mov edi, eax // 8b45fc | mov eax, dword ptr [ebp - 4] // 40 | inc eax // 50 | push eax // 57 | push edi // e8???????? | // 8d45a8 | lea eax, [ebp - 0x58] $sequence_6 = { 50 ff7508 56 57 ff15???????? 8b45ec 8d4df0 } // n = 7, score = 300 // 50 | push eax // ff7508 | push dword ptr [ebp + 8] // 56 | push esi // 57 | push edi // ff15???????? | // 8b45ec | mov eax, dword ptr [ebp - 0x14] // 8d4df0 | lea ecx, [ebp - 0x10] $sequence_7 = { 83ec10 56 8bf1 33d2 } // n = 4, score = 300 // 83ec10 | sub esp, 0x10 // 56 | push esi // 8bf1 | mov esi, ecx // 33d2 | xor edx, edx $sequence_8 = { 53 ff15???????? 8bf0 3bf7 8975ec 7509 53 } // n = 7, score = 300 // 53 | push ebx // ff15???????? | // 8bf0 | mov esi, eax // 3bf7 | cmp esi, edi // 8975ec | mov dword ptr [ebp - 0x14], esi // 7509 | jne 0xb // 53 | push ebx $sequence_9 = { 8bf9 7502 33db 8a0c3e 8808 8b4dfc } // n = 6, score = 300 // 8bf9 | mov edi, ecx // 7502 | jne 4 // 33db | xor ebx, ebx // 8a0c3e | mov cl, byte ptr [esi + edi] // 8808 | mov byte ptr [eax], cl // 8b4dfc | mov ecx, dword ptr [ebp - 4] condition: 7 of them and filesize < 49152 }
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