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rule win_auriga_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.auriga." 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.auriga" 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 = { 90 5f bb???????? 81eb???????? 2bfb 8bf7 e8???????? } // n = 7, score = 100 // 90 | nop // 5f | pop edi // bb???????? | // 81eb???????? | // 2bfb | sub edi, ebx // 8bf7 | mov esi, edi // e8???????? | $sequence_1 = { 755b 817e0c03001200 7552 57 } // n = 4, score = 100 // 755b | jne 0x5d // 817e0c03001200 | cmp dword ptr [esi + 0xc], 0x120003 // 7552 | jne 0x54 // 57 | push edi $sequence_2 = { e8???????? c9 c20c00 ffb508fcffff 8b8504fcffff 8d8405fcfbffff } // n = 6, score = 100 // e8???????? | // c9 | leave // c20c00 | ret 0xc // ffb508fcffff | push dword ptr [ebp - 0x3f8] // 8b8504fcffff | mov eax, dword ptr [ebp - 0x3fc] // 8d8405fcfbffff | lea eax, [ebp + eax - 0x404] $sequence_3 = { 4a 3bda 745e 7345 2bd3 } // n = 5, score = 100 // 4a | dec edx // 3bda | cmp ebx, edx // 745e | je 0x60 // 7345 | jae 0x47 // 2bd3 | sub edx, ebx $sequence_4 = { 7408 8b0d???????? 8908 56 8b7508 837e0400 7422 } // n = 7, score = 100 // 7408 | je 0xa // 8b0d???????? | // 8908 | mov dword ptr [eax], ecx // 56 | push esi // 8b7508 | mov esi, dword ptr [ebp + 8] // 837e0400 | cmp dword ptr [esi + 4], 0 // 7422 | je 0x24 $sequence_5 = { 53 53 6a01 6a01 56 ff15???????? 8945dc } // n = 7, score = 100 // 53 | push ebx // 53 | push ebx // 6a01 | push 1 // 6a01 | push 1 // 56 | push esi // ff15???????? | // 8945dc | mov dword ptr [ebp - 0x24], eax $sequence_6 = { 84c0 7511 ff7510 ff15???????? } // n = 4, score = 100 // 84c0 | test al, al // 7511 | jne 0x13 // ff7510 | push dword ptr [ebp + 0x10] // ff15???????? | $sequence_7 = { ff45fc 8b4dec ff4df8 2bcb 295df4 ff45f8 } // n = 6, score = 100 // ff45fc | inc dword ptr [ebp - 4] // 8b4dec | mov ecx, dword ptr [ebp - 0x14] // ff4df8 | dec dword ptr [ebp - 8] // 2bcb | sub ecx, ebx // 295df4 | sub dword ptr [ebp - 0xc], ebx // ff45f8 | inc dword ptr [ebp - 8] $sequence_8 = { ffd3 8b45fc 85c0 7539 ff750c 8d45f4 } // n = 6, score = 100 // ffd3 | call ebx // 8b45fc | mov eax, dword ptr [ebp - 4] // 85c0 | test eax, eax // 7539 | jne 0x3b // ff750c | push dword ptr [ebp + 0xc] // 8d45f4 | lea eax, [ebp - 0xc] $sequence_9 = { 8b85e8fbffff 85c0 7566 ffb5ecfbffff 8d85f0fbffff } // n = 5, score = 100 // 8b85e8fbffff | mov eax, dword ptr [ebp - 0x418] // 85c0 | test eax, eax // 7566 | jne 0x68 // ffb5ecfbffff | push dword ptr [ebp - 0x414] // 8d85f0fbffff | lea eax, [ebp - 0x410] condition: 7 of them and filesize < 75776 }
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