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rule win_hermeticwizard_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" 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 = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { 8b4608 3b4208 eb31 83f803 7531 8d4a04 8d4604 } // n = 7, score = 100 // 8b4608 | mov eax, dword ptr [esi + 8] // 3b4208 | cmp eax, dword ptr [edx + 8] // eb31 | jmp 0x33 // 83f803 | cmp eax, 3 // 7531 | jne 0x33 // 8d4a04 | lea ecx, [edx + 4] // 8d4604 | lea eax, [esi + 4] $sequence_1 = { 33c9 66897dca 6800080000 50 } // n = 4, score = 100 // 33c9 | xor ecx, ecx // 66897dca | mov word ptr [ebp - 0x36], di // 6800080000 | push 0x800 // 50 | push eax $sequence_2 = { 8b35???????? ffd6 ff75e8 ffd6 5e 8b4508 5f } // n = 7, score = 100 // 8b35???????? | // ffd6 | call esi // ff75e8 | push dword ptr [ebp - 0x18] // ffd6 | call esi // 5e | pop esi // 8b4508 | mov eax, dword ptr [ebp + 8] // 5f | pop edi $sequence_3 = { 6bc930 53 8b5d10 8b0485c0dd0110 56 } // n = 5, score = 100 // 6bc930 | imul ecx, ecx, 0x30 // 53 | push ebx // 8b5d10 | mov ebx, dword ptr [ebp + 0x10] // 8b0485c0dd0110 | mov eax, dword ptr [eax*4 + 0x1001ddc0] // 56 | push esi $sequence_4 = { 6689854cffffff 6689854effffff 66898554ffffff 6689855effffff 66898d58ffffff 66898d5affffff 59 } // n = 7, score = 100 // 6689854cffffff | mov word ptr [ebp - 0xb4], ax // 6689854effffff | mov word ptr [ebp - 0xb2], ax // 66898554ffffff | mov word ptr [ebp - 0xac], ax // 6689855effffff | mov word ptr [ebp - 0xa2], ax // 66898d58ffffff | mov word ptr [ebp - 0xa8], cx // 66898d5affffff | mov word ptr [ebp - 0xa6], cx // 59 | pop ecx $sequence_5 = { 8d4608 50 8d4908 e8???????? } // n = 4, score = 100 // 8d4608 | lea eax, [esi + 8] // 50 | push eax // 8d4908 | lea ecx, [ecx + 8] // e8???????? | $sequence_6 = { 6a02 58 668945e8 8b4104 } // n = 4, score = 100 // 6a02 | push 2 // 58 | pop eax // 668945e8 | mov word ptr [ebp - 0x18], ax // 8b4104 | mov eax, dword ptr [ecx + 4] $sequence_7 = { c3 837d08ff 0f8401070000 e9???????? e9???????? 55 8bec } // n = 7, score = 100 // c3 | ret // 837d08ff | cmp dword ptr [ebp + 8], -1 // 0f8401070000 | je 0x707 // e9???????? | // e9???????? | // 55 | push ebp // 8bec | mov ebp, esp $sequence_8 = { ff15???????? 83f87a 7567 ff75fc 6a08 ff15???????? 50 } // n = 7, score = 100 // ff15???????? | // 83f87a | cmp eax, 0x7a // 7567 | jne 0x69 // ff75fc | push dword ptr [ebp - 4] // 6a08 | push 8 // ff15???????? | // 50 | push eax $sequence_9 = { ff15???????? 85c0 7504 b001 eb3a 57 56 } // n = 7, score = 100 // ff15???????? | // 85c0 | test eax, eax // 7504 | jne 6 // b001 | mov al, 1 // eb3a | jmp 0x3c // 57 | push edi // 56 | push esi condition: 7 of them and filesize < 263168 }
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