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rule win_auriga_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" 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 = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { 7514 68???????? e8???????? c785f8fbffff010000c0 53 53 } // n = 6, score = 100 // 7514 | jne 0x16 // 68???????? | // e8???????? | // c785f8fbffff010000c0 | mov dword ptr [ebp - 0x408], 0xc0000001 // 53 | push ebx // 53 | push ebx $sequence_1 = { ff15???????? 3bc6 5e 750b ff7508 } // n = 5, score = 100 // ff15???????? | // 3bc6 | cmp eax, esi // 5e | pop esi // 750b | jne 0xd // ff7508 | push dword ptr [ebp + 8] $sequence_2 = { 6800000080 8d85f8fbffff 50 c785dcfbffff18000000 } // n = 4, score = 100 // 6800000080 | push 0x80000000 // 8d85f8fbffff | lea eax, [ebp - 0x408] // 50 | push eax // c785dcfbffff18000000 | mov dword ptr [ebp - 0x424], 0x18 $sequence_3 = { 6a28 8d858cfbffff 50 8d85d4fbffff } // n = 4, score = 100 // 6a28 | push 0x28 // 8d858cfbffff | lea eax, [ebp - 0x474] // 50 | push eax // 8d85d4fbffff | lea eax, [ebp - 0x42c] $sequence_4 = { eb03 8b7604 8b0d???????? 2bf0 8b3c31 ff45ec e9???????? } // n = 7, score = 100 // eb03 | jmp 5 // 8b7604 | mov esi, dword ptr [esi + 4] // 8b0d???????? | // 2bf0 | sub esi, eax // 8b3c31 | mov edi, dword ptr [ecx + esi] // ff45ec | inc dword ptr [ebp - 0x14] // e9???????? | $sequence_5 = { 6800040000 8d85fcfbffff 50 6a01 8d85d4fbffff 50 ffb5f8fbffff } // n = 7, score = 100 // 6800040000 | push 0x400 // 8d85fcfbffff | lea eax, [ebp - 0x404] // 50 | push eax // 6a01 | push 1 // 8d85d4fbffff | lea eax, [ebp - 0x42c] // 50 | push eax // ffb5f8fbffff | push dword ptr [ebp - 0x408] $sequence_6 = { 7421 8b15???????? 83fb01 7c04 3bfe 7410 8b0402 } // n = 7, score = 100 // 7421 | je 0x23 // 8b15???????? | // 83fb01 | cmp ebx, 1 // 7c04 | jl 6 // 3bfe | cmp edi, esi // 7410 | je 0x12 // 8b0402 | mov eax, dword ptr [edx + eax] $sequence_7 = { 756e 8d45c4 50 56 ff15???????? a1???????? } // n = 6, score = 100 // 756e | jne 0x70 // 8d45c4 | lea eax, [ebp - 0x3c] // 50 | push eax // 56 | push esi // ff15???????? | // a1???????? | $sequence_8 = { 50 ffd3 8b45fc 85c0 7539 ff750c } // n = 6, score = 100 // 50 | push eax // ffd3 | call ebx // 8b45fc | mov eax, dword ptr [ebp - 4] // 85c0 | test eax, eax // 7539 | jne 0x3b // ff750c | push dword ptr [ebp + 0xc] $sequence_9 = { c705????????84000000 c705????????88000000 a3???????? c705????????64010000 c705????????4a000000 } // n = 5, score = 100 // c705????????84000000 | // c705????????88000000 | // a3???????? | // c705????????64010000 | // c705????????4a000000 | condition: 7 of them and filesize < 75776 }
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