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rule win_taidoor_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-12-22" version = "1" description = "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 = "20201222" malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130" malpedia_version = "20201023" 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 = { 53 56 57 a0???????? 33ff } // n = 5, score = 300 // 53 | push ebx // 56 | push esi // 57 | push edi // a0???????? | // 33ff | xor edi, edi $sequence_1 = { 7441 0fb68699010000 50 0fb68698010000 50 0fb68697010000 } // n = 6, score = 300 // 7441 | je 0x43 // 0fb68699010000 | movzx eax, byte ptr [esi + 0x199] // 50 | push eax // 0fb68698010000 | movzx eax, byte ptr [esi + 0x198] // 50 | push eax // 0fb68697010000 | movzx eax, byte ptr [esi + 0x197] $sequence_2 = { 8dbdecfcffff 8b4d10 8b45fc 8a0408 3c5c } // n = 5, 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 $sequence_3 = { ff7510 ff15???????? ff7510 ff15???????? 8d85f0fdffff } // n = 5, score = 300 // ff7510 | push dword ptr [ebp + 0x10] // ff15???????? | // ff7510 | push dword ptr [ebp + 0x10] // ff15???????? | // 8d85f0fdffff | lea eax, [ebp - 0x210] $sequence_4 = { 57 a0???????? c745fc01000000 8ac8 f6d9 1bc9 33db } // n = 7, score = 300 // 57 | push edi // a0???????? | // c745fc01000000 | mov dword ptr [ebp - 4], 1 // 8ac8 | mov cl, al // f6d9 | neg cl // 1bc9 | sbb ecx, ecx // 33db | xor ebx, ebx $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 = { 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_7 = { b940420f00 f7f9 8d45e0 52 ff35???????? ff35???????? } // n = 6, score = 300 // b940420f00 | mov ecx, 0xf4240 // f7f9 | idiv ecx // 8d45e0 | lea eax, [ebp - 0x20] // 52 | push edx // ff35???????? | // ff35???????? | $sequence_8 = { e9???????? 8d4de0 e8???????? 8d8588f7ffff 50 ff35???????? ffd6 } // n = 7, score = 300 // e9???????? | // 8d4de0 | lea ecx, [ebp - 0x20] // e8???????? | // 8d8588f7ffff | lea eax, [ebp - 0x878] // 50 | push eax // ff35???????? | // ffd6 | call esi $sequence_9 = { 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 condition: 7 of them and filesize < 49152 }
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