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rule win_boaxxe_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.boaxxe." 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.boaxxe" 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 = { b904000000 e8???????? 8d55c4 66b8c503 e8???????? 8b55c4 a1???????? } // n = 7, score = 100 // b904000000 | mov ecx, 4 // e8???????? | // 8d55c4 | lea edx, [ebp - 0x3c] // 66b8c503 | mov ax, 0x3c5 // e8???????? | // 8b55c4 | mov edx, dword ptr [ebp - 0x3c] // a1???????? | $sequence_1 = { 0f8c88000000 8d4df4 8b55f8 8b45f8 e8???????? 8b55f4 8d45f8 } // n = 7, score = 100 // 0f8c88000000 | jl 0x8e // 8d4df4 | lea ecx, [ebp - 0xc] // 8b55f8 | mov edx, dword ptr [ebp - 8] // 8b45f8 | mov eax, dword ptr [ebp - 8] // e8???????? | // 8b55f4 | mov edx, dword ptr [ebp - 0xc] // 8d45f8 | lea eax, [ebp - 8] $sequence_2 = { 83c220 8d45f8 e8???????? 8d45f8 e8???????? 8945f4 8b45f4 } // n = 7, score = 100 // 83c220 | add edx, 0x20 // 8d45f8 | lea eax, [ebp - 8] // e8???????? | // 8d45f8 | lea eax, [ebp - 8] // e8???????? | // 8945f4 | mov dword ptr [ebp - 0xc], eax // 8b45f4 | mov eax, dword ptr [ebp - 0xc] $sequence_3 = { 33c0 55 68???????? 64ff30 648920 8bcb b230 } // n = 7, score = 100 // 33c0 | xor eax, eax // 55 | push ebp // 68???????? | // 64ff30 | push dword ptr fs:[eax] // 648920 | mov dword ptr fs:[eax], esp // 8bcb | mov ecx, ebx // b230 | mov dl, 0x30 $sequence_4 = { 85db 7410 8b55f4 8b45ec 8bcb e8???????? } // n = 6, score = 100 // 85db | test ebx, ebx // 7410 | je 0x12 // 8b55f4 | mov edx, dword ptr [ebp - 0xc] // 8b45ec | mov eax, dword ptr [ebp - 0x14] // 8bcb | mov ecx, ebx // e8???????? | $sequence_5 = { 8b45cc e8???????? 8bd8 891d???????? 891d???????? 8d45c8 50 } // n = 7, score = 100 // 8b45cc | mov eax, dword ptr [ebp - 0x34] // e8???????? | // 8bd8 | mov ebx, eax // 891d???????? | // 891d???????? | // 8d45c8 | lea eax, [ebp - 0x38] // 50 | push eax $sequence_6 = { 01d0 c1e003 8b803c58bc6d 8945ec e9???????? 837de808 } // n = 6, score = 100 // 01d0 | add eax, edx // c1e003 | shl eax, 3 // 8b803c58bc6d | mov eax, dword ptr [eax + 0x6dbc583c] // 8945ec | mov dword ptr [ebp - 0x14], eax // e9???????? | // 837de808 | cmp dword ptr [ebp - 0x18], 8 $sequence_7 = { a1???????? e8???????? 8bd0 53 8bc2 e9???????? 33c0 } // n = 7, score = 100 // a1???????? | // e8???????? | // 8bd0 | mov edx, eax // 53 | push ebx // 8bc2 | mov eax, edx // e9???????? | // 33c0 | xor eax, eax $sequence_8 = { 0342fc 8945ec 8b45f8 8b00 8b5508 0342fc 8945f0 } // n = 7, score = 100 // 0342fc | add eax, dword ptr [edx - 4] // 8945ec | mov dword ptr [ebp - 0x14], eax // 8b45f8 | mov eax, dword ptr [ebp - 8] // 8b00 | mov eax, dword ptr [eax] // 8b5508 | mov edx, dword ptr [ebp + 8] // 0342fc | add eax, dword ptr [edx - 4] // 8945f0 | mov dword ptr [ebp - 0x10], eax $sequence_9 = { b808000000 e8???????? 8b55f8 58 e8???????? 7504 33db } // n = 7, score = 100 // b808000000 | mov eax, 8 // e8???????? | // 8b55f8 | mov edx, dword ptr [ebp - 8] // 58 | pop eax // e8???????? | // 7504 | jne 6 // 33db | xor ebx, ebx condition: 7 of them and filesize < 1146880 }
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