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rule win_hermeticwizard_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.hermeticwizard." 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.hermeticwizard" 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 = { 33ff 837d0c00 744b 53 ff750c ff15???????? } // n = 6, score = 100 // 33ff | xor edi, edi // 837d0c00 | cmp dword ptr [ebp + 0xc], 0 // 744b | je 0x4d // 53 | push ebx // ff750c | push dword ptr [ebp + 0xc] // ff15???????? | $sequence_1 = { 894de0 ff15???????? f7d8 1ac0 fec0 5f } // n = 6, score = 100 // 894de0 | mov dword ptr [ebp - 0x20], ecx // ff15???????? | // f7d8 | neg eax // 1ac0 | sbb al, al // fec0 | inc al // 5f | pop edi $sequence_2 = { 7415 668b5902 663b5f02 750f } // n = 4, score = 100 // 7415 | je 0x17 // 668b5902 | mov bx, word ptr [ecx + 2] // 663b5f02 | cmp bx, word ptr [edi + 2] // 750f | jne 0x11 $sequence_3 = { 8b450c 0fb684c8c05d0110 c1e804 5d c20800 } // n = 5, score = 100 // 8b450c | mov eax, dword ptr [ebp + 0xc] // 0fb684c8c05d0110 | movzx eax, byte ptr [eax + ecx*8 + 0x10015dc0] // c1e804 | shr eax, 4 // 5d | pop ebp // c20800 | ret 8 $sequence_4 = { 8bcf 50 e8???????? eb61 8d45e8 8bce } // n = 6, score = 100 // 8bcf | mov ecx, edi // 50 | push eax // e8???????? | // eb61 | jmp 0x63 // 8d45e8 | lea eax, [ebp - 0x18] // 8bce | mov ecx, esi $sequence_5 = { 6bc930 53 56 8b0485c0dd0110 33db 8b7508 } // n = 6, score = 100 // 6bc930 | imul ecx, ecx, 0x30 // 53 | push ebx // 56 | push esi // 8b0485c0dd0110 | mov eax, dword ptr [eax*4 + 0x1001ddc0] // 33db | xor ebx, ebx // 8b7508 | mov esi, dword ptr [ebp + 8] $sequence_6 = { 0f84d3000000 8b048dc47c0110 89859cf8ffff 85c0 0f8498000000 } // n = 5, score = 100 // 0f84d3000000 | je 0xd9 // 8b048dc47c0110 | mov eax, dword ptr [ecx*4 + 0x10017cc4] // 89859cf8ffff | mov dword ptr [ebp - 0x764], eax // 85c0 | test eax, eax // 0f8498000000 | je 0x9e $sequence_7 = { 66894584 33c0 66894586 8d856cffffff 50 6689957affffff } // n = 6, score = 100 // 66894584 | mov word ptr [ebp - 0x7c], ax // 33c0 | xor eax, eax // 66894586 | mov word ptr [ebp - 0x7a], ax // 8d856cffffff | lea eax, [ebp - 0x94] // 50 | push eax // 6689957affffff | mov word ptr [ebp - 0x86], dx $sequence_8 = { 750c 8b4d08 8d4708 50 e8???????? 8b3f } // n = 6, score = 100 // 750c | jne 0xe // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 8d4708 | lea eax, [edi + 8] // 50 | push eax // e8???????? | // 8b3f | mov edi, dword ptr [edi] $sequence_9 = { 8bd1 8d7de4 59 33c0 } // n = 4, score = 100 // 8bd1 | mov edx, ecx // 8d7de4 | lea edi, [ebp - 0x1c] // 59 | pop ecx // 33c0 | xor eax, eax condition: 7 of them and filesize < 263168 }
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