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rule win_auriga_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" 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 = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { 53 8b5d0c 56 8b7360 803e0e 7561 807e0100 } // n = 7, score = 100 // 53 | push ebx // 8b5d0c | mov ebx, dword ptr [ebp + 0xc] // 56 | push esi // 8b7360 | mov esi, dword ptr [ebx + 0x60] // 803e0e | cmp byte ptr [esi], 0xe // 7561 | jne 0x63 // 807e0100 | cmp byte ptr [esi + 1], 0 $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 = { c20800 90 5f bb???????? 81eb???????? 2bfb 8bf7 } // n = 7, score = 100 // c20800 | ret 8 // 90 | nop // 5f | pop edi // bb???????? | // 81eb???????? | // 2bfb | sub edi, ebx // 8bf7 | mov esi, edi $sequence_3 = { 83c114 3bfa 894df4 7291 } // n = 4, score = 100 // 83c114 | add ecx, 0x14 // 3bfa | cmp edi, edx // 894df4 | mov dword ptr [ebp - 0xc], ecx // 7291 | jb 0xffffff93 $sequence_4 = { ffd6 8bc7 e9???????? 895dfc 6a01 53 56 } // n = 7, score = 100 // ffd6 | call esi // 8bc7 | mov eax, edi // e9???????? | // 895dfc | mov dword ptr [ebp - 4], ebx // 6a01 | push 1 // 53 | push ebx // 56 | push esi $sequence_5 = { 56 8d85d4fbffff 50 8d85dcfbffff 50 6800000040 } // n = 6, score = 100 // 56 | push esi // 8d85d4fbffff | lea eax, [ebp - 0x42c] // 50 | push eax // 8d85dcfbffff | lea eax, [ebp - 0x424] // 50 | push eax // 6800000040 | push 0x40000000 $sequence_6 = { 7407 b8010000c0 eb51 833d????????00 74f0 56 } // n = 6, score = 100 // 7407 | je 9 // b8010000c0 | mov eax, 0xc0000001 // eb51 | jmp 0x53 // 833d????????00 | // 74f0 | je 0xfffffff2 // 56 | push esi $sequence_7 = { 8975d8 c605????????00 e8???????? 33c0 } // n = 4, score = 100 // 8975d8 | mov dword ptr [ebp - 0x28], esi // c605????????00 | // e8???????? | // 33c0 | xor eax, eax $sequence_8 = { 53 56 8b750c 8b4660 33db } // n = 5, score = 100 // 53 | push ebx // 56 | push esi // 8b750c | mov esi, dword ptr [ebp + 0xc] // 8b4660 | mov eax, dword ptr [esi + 0x60] // 33db | xor ebx, ebx $sequence_9 = { 8b3c30 ff45ec eba1 8bc6 eb02 } // n = 5, score = 100 // 8b3c30 | mov edi, dword ptr [eax + esi] // ff45ec | inc dword ptr [ebp - 0x14] // eba1 | jmp 0xffffffa3 // 8bc6 | mov eax, esi // eb02 | jmp 4 condition: 7 of them and filesize < 75776 }
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