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rule win_taidoor_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { 7433 ff750c 889c05f4fbffff 50 8d85f4fbffff 6a01 50 } // n = 7, score = 300 // 7433 | je 0x35 // ff750c | push dword ptr [ebp + 0xc] // 889c05f4fbffff | mov byte ptr [ebp + eax - 0x40c], bl // 50 | push eax // 8d85f4fbffff | lea eax, [ebp - 0x40c] // 6a01 | push 1 // 50 | push eax $sequence_1 = { 8dbdecfcffff 8b4d10 8b45fc 8a0408 3c5c 7507 8807 } // n = 7, score = 300 // 8dbdecfcffff | lea edi, [ebp - 0x314] // 8b4d10 | mov ecx, dword ptr [ebp + 0x10] // 8b45fc | mov eax, dword ptr [ebp - 4] // 8a0408 | mov al, byte ptr [eax + ecx] // 3c5c | cmp al, 0x5c // 7507 | jne 9 // 8807 | mov byte ptr [edi], al $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 = { 33c0 8d7104 880406 40 3d00010000 7cf5 c745fcfcffffff } // n = 7, score = 300 // 33c0 | xor eax, eax // 8d7104 | lea esi, [ecx + 4] // 880406 | mov byte ptr [esi + eax], al // 40 | inc eax // 3d00010000 | cmp eax, 0x100 // 7cf5 | jl 0xfffffff7 // c745fcfcffffff | mov dword ptr [ebp - 4], 0xfffffffc $sequence_4 = { 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_5 = { ff35???????? ffd6 99 b940420f00 f7f9 8d45f0 52 } // n = 7, score = 300 // ff35???????? | // ffd6 | call esi // 99 | cdq // b940420f00 | mov ecx, 0xf4240 // f7f9 | idiv ecx // 8d45f0 | lea eax, [ebp - 0x10] // 52 | push edx $sequence_6 = { 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_7 = { 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_8 = { ff75f0 ffd6 8d4d08 885dfc e8???????? 834dfcff 8d4d10 } // n = 7, score = 300 // ff75f0 | push dword ptr [ebp - 0x10] // ffd6 | call esi // 8d4d08 | lea ecx, [ebp + 8] // 885dfc | mov byte ptr [ebp - 4], bl // e8???????? | // 834dfcff | or dword ptr [ebp - 4], 0xffffffff // 8d4d10 | lea ecx, [ebp + 0x10] $sequence_9 = { eb37 ff7518 ff7514 51 8bcc 8965ec } // n = 6, score = 300 // eb37 | jmp 0x39 // ff7518 | push dword ptr [ebp + 0x18] // ff7514 | push dword ptr [ebp + 0x14] // 51 | push ecx // 8bcc | mov ecx, esp // 8965ec | mov dword ptr [ebp - 0x14], esp condition: 7 of them and filesize < 49152 }
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