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rule win_soraya_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.soraya." 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.soraya" 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 = { ff15???????? 8d48bf 80f919 77f2 } // n = 4, score = 200 // ff15???????? | // 8d48bf | lea ecx, [eax - 0x41] // 80f919 | cmp cl, 0x19 // 77f2 | ja 0xfffffff4 $sequence_1 = { e8???????? 488d151af0ffff 488d8d60020000 ff15???????? e8???????? 488d8d60020000 488bd0 } // n = 7, score = 100 // e8???????? | // 488d151af0ffff | mov ecx, dword ptr [ebp + 0x150] // 488d8d60020000 | dec esp // ff15???????? | // e8???????? | // 488d8d60020000 | lea ecx, [ebp + 0x148] // 488bd0 | dec eax $sequence_2 = { 57 8bd8 56 53 e8???????? 8b733c } // n = 6, score = 100 // 57 | push edi // 8bd8 | mov ebx, eax // 56 | push esi // 53 | push ebx // e8???????? | // 8b733c | mov esi, dword ptr [ebx + 0x3c] $sequence_3 = { 33c1 99 b99a000000 f7f9 b8fe340000 } // n = 5, score = 100 // 33c1 | xor eax, ecx // 99 | cdq // b99a000000 | mov ecx, 0x9a // f7f9 | idiv ecx // b8fe340000 | mov eax, 0x34fe $sequence_4 = { 488bd0 4c8b4850 498bcb 41b86b000000 } // n = 4, score = 100 // 488bd0 | push ebx // 4c8b4850 | dec eax // 498bcb | sub esp, 0x30 // 41b86b000000 | dec eax $sequence_5 = { 41b800300000 ff15???????? 488b8d50010000 4c8d8d48010000 488bd8 488d8540010000 488d1565f4ffff } // n = 7, score = 100 // 41b800300000 | mov ebx, eax // ff15???????? | // 488b8d50010000 | dec eax // 4c8d8d48010000 | mov edi, edx // 488bd8 | inc ecx // 488d8540010000 | mov eax, 0x3000 // 488d1565f4ffff | dec eax $sequence_6 = { 8b4c2414 33c6 33ce 03c1 } // n = 4, score = 100 // 8b4c2414 | mov ecx, dword ptr [esp + 0x14] // 33c6 | xor eax, esi // 33ce | xor ecx, esi // 03c1 | add eax, ecx $sequence_7 = { 418bd6 3bcb 72c8 4c891d???????? 488d0d1fe0ffff } // n = 5, score = 100 // 418bd6 | lea ecx, [ebp + 0x260] // 3bcb | dec eax // 72c8 | mov edx, eax // 4c891d???????? | // 488d0d1fe0ffff | je 0x46 $sequence_8 = { 894df4 0f8501010000 53 56 8b7178 } // n = 5, score = 100 // 894df4 | mov dword ptr [ebp - 0xc], ecx // 0f8501010000 | jne 0x107 // 53 | push ebx // 56 | push esi // 8b7178 | mov esi, dword ptr [ecx + 0x78] $sequence_9 = { 8b4a0c 8b7210 03c8 8365fc00 8b55fc ff45fc } // n = 6, score = 100 // 8b4a0c | mov ecx, dword ptr [edx + 0xc] // 8b7210 | mov esi, dword ptr [edx + 0x10] // 03c8 | add ecx, eax // 8365fc00 | and dword ptr [ebp - 4], 0 // 8b55fc | mov edx, dword ptr [ebp - 4] // ff45fc | inc dword ptr [ebp - 4] $sequence_10 = { 488d0dfadfffff ff15???????? 488bc8 e8???????? 488d0df5dfffff ff15???????? 488d15f8dfffff } // n = 7, score = 100 // 488d0dfadfffff | lea edx, [0xfffff01a] // ff15???????? | // 488bc8 | dec eax // e8???????? | // 488d0df5dfffff | lea ecx, [ebp + 0x260] // ff15???????? | // 488d15f8dfffff | dec eax $sequence_11 = { 689b558d52 6853d56c36 68ff555535 68f9d6feff 6888888868 } // n = 5, score = 100 // 689b558d52 | push 0x528d559b // 6853d56c36 | push 0x366cd553 // 68ff555535 | push 0x355555ff // 68f9d6feff | push 0xfffed6f9 // 6888888868 | push 0x68888888 $sequence_12 = { 8b45ec 2bf8 037d10 8b45e8 } // n = 4, score = 100 // 8b45ec | mov eax, dword ptr [ebp - 0x14] // 2bf8 | sub edi, eax // 037d10 | add edi, dword ptr [ebp + 0x10] // 8b45e8 | mov eax, dword ptr [ebp - 0x18] $sequence_13 = { 2bd0 894de0 3bd1 7649 8b55f8 33d6 } // n = 6, score = 100 // 2bd0 | sub edx, eax // 894de0 | mov dword ptr [ebp - 0x20], ecx // 3bd1 | cmp edx, ecx // 7649 | jbe 0x4b // 8b55f8 | mov edx, dword ptr [ebp - 8] // 33d6 | xor edx, esi $sequence_14 = { 03570c 034f0c 807df800 8a540203 8a4c0102 8855fb } // n = 6, score = 100 // 03570c | add edx, dword ptr [edi + 0xc] // 034f0c | add ecx, dword ptr [edi + 0xc] // 807df800 | cmp byte ptr [ebp - 8], 0 // 8a540203 | mov dl, byte ptr [edx + eax + 3] // 8a4c0102 | mov cl, byte ptr [ecx + eax + 2] // 8855fb | mov byte ptr [ebp - 5], dl $sequence_15 = { 8b3d???????? 6a1c 8d45e0 50 6a00 } // n = 5, score = 100 // 8b3d???????? | // 6a1c | push 0x1c // 8d45e0 | lea eax, [ebp - 0x20] // 50 | push eax // 6a00 | push 0 $sequence_16 = { 7444 53 4883ec30 488bd9 b910270000 ff15???????? 8364242800 } // n = 7, score = 100 // 7444 | mov ebx, eax // 53 | dec eax // 4883ec30 | lea eax, [ebp + 0x140] // 488bd9 | dec eax // b910270000 | lea edx, [0xfffff465] // ff15???????? | // 8364242800 | dec eax $sequence_17 = { 488d0d73f8ffff 498bd8 488bfa ff15???????? } // n = 4, score = 100 // 488d0d73f8ffff | dec eax // 498bd8 | lea ecx, [0xfffff873] // 488bfa | dec ecx // ff15???????? | $sequence_18 = { 56 57 8d85fcfdffff 6800020000 50 e8???????? } // n = 6, score = 100 // 56 | push esi // 57 | push edi // 8d85fcfdffff | lea eax, [ebp - 0x204] // 6800020000 | push 0x200 // 50 | push eax // e8???????? | $sequence_19 = { ff45dc 295de0 4e 75e8 b844060000 0345c8 } // n = 6, score = 100 // ff45dc | inc dword ptr [ebp - 0x24] // 295de0 | sub dword ptr [ebp - 0x20], ebx // 4e | dec esi // 75e8 | jne 0xffffffea // b844060000 | mov eax, 0x644 // 0345c8 | add eax, dword ptr [ebp - 0x38] $sequence_20 = { 7424 56 6a00 683a040000 ff15???????? 8bf0 85f6 } // n = 7, score = 100 // 7424 | je 0x26 // 56 | push esi // 6a00 | push 0 // 683a040000 | push 0x43a // ff15???????? | // 8bf0 | mov esi, eax // 85f6 | test esi, esi $sequence_21 = { 8dbc07fe3ef2ff 8b45d8 33c6 3bbc05be3ef2ff 0f82bdfdffff } // n = 5, score = 100 // 8dbc07fe3ef2ff | lea edi, [edi + eax - 0xdc102] // 8b45d8 | mov eax, dword ptr [ebp - 0x28] // 33c6 | xor eax, esi // 3bbc05be3ef2ff | cmp edi, dword ptr [ebp + eax - 0xdc142] // 0f82bdfdffff | jb 0xfffffdc3 $sequence_22 = { 8b45fc 8b4dec 8b4508 8b9578ffffff 8b80d8010000 33d3 } // n = 6, score = 100 // 8b45fc | mov eax, dword ptr [ebp - 4] // 8b4dec | mov ecx, dword ptr [ebp - 0x14] // 8b4508 | mov eax, dword ptr [ebp + 8] // 8b9578ffffff | mov edx, dword ptr [ebp - 0x88] // 8b80d8010000 | mov eax, dword ptr [eax + 0x1d8] // 33d3 | xor edx, ebx condition: 7 of them and filesize < 188416 }
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