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rule win_taidoor_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" 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 = "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 = { 7cf5 c745fcfcffffff 33ff 33db } // n = 4, score = 300 // 7cf5 | jl 0xfffffff7 // c745fcfcffffff | mov dword ptr [ebp - 4], 0xfffffffc // 33ff | xor edi, edi // 33db | xor ebx, ebx $sequence_1 = { e8???????? 8b3d???????? 83f86f 750c 56 ffd7 } // n = 6, score = 300 // e8???????? | // 8b3d???????? | // 83f86f | cmp eax, 0x6f // 750c | jne 0xe // 56 | push esi // ffd7 | call edi $sequence_2 = { 7e24 8a0406 fec0 3c3a 8845ec } // n = 5, score = 300 // 7e24 | jle 0x26 // 8a0406 | mov al, byte ptr [esi + eax] // fec0 | inc al // 3c3a | cmp al, 0x3a // 8845ec | mov byte ptr [ebp - 0x14], al $sequence_3 = { 8d45e0 57 50 8d45e4 897de4 } // n = 5, score = 300 // 8d45e0 | lea eax, [ebp - 0x20] // 57 | push edi // 50 | push eax // 8d45e4 | lea eax, [ebp - 0x1c] // 897de4 | mov dword ptr [ebp - 0x1c], edi $sequence_4 = { 8b4d08 50 e8???????? c745e801000000 8065fc00 } // n = 5, score = 300 // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 50 | push eax // e8???????? | // c745e801000000 | mov dword ptr [ebp - 0x18], 1 // 8065fc00 | and byte ptr [ebp - 4], 0 $sequence_5 = { 6a04 8d45d4 51 50 e8???????? 8b45d4 83c40c } // n = 7, score = 300 // 6a04 | push 4 // 8d45d4 | lea eax, [ebp - 0x2c] // 51 | push ecx // 50 | push eax // e8???????? | // 8b45d4 | mov eax, dword ptr [ebp - 0x2c] // 83c40c | add esp, 0xc $sequence_6 = { 83ec10 56 8bf1 33d2 } // n = 4, score = 300 // 83ec10 | sub esp, 0x10 // 56 | push esi // 8bf1 | mov esi, ecx // 33d2 | xor edx, edx $sequence_7 = { 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_8 = { ff7510 f3ab 8b35???????? 895df8 66ab } // n = 5, score = 300 // ff7510 | push dword ptr [ebp + 0x10] // f3ab | rep stosd dword ptr es:[edi], eax // 8b35???????? | // 895df8 | mov dword ptr [ebp - 8], ebx // 66ab | stosw word ptr es:[edi], ax $sequence_9 = { 889c05f4fbffff 50 8d85f4fbffff 6a01 50 } // n = 5, score = 300 // 889c05f4fbffff | mov byte ptr [ebp + eax - 0x40c], bl // 50 | push eax // 8d85f4fbffff | lea eax, [ebp - 0x40c] // 6a01 | push 1 // 50 | push eax condition: 7 of them and filesize < 49152 }
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