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rule win_auriga_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" 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 = "20220405" malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a" malpedia_version = "20220411" 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???????? 83c40c 85c0 756e 8d45c4 50 } // n = 6, score = 100 // ff15???????? | // 83c40c | add esp, 0xc // 85c0 | test eax, eax // 756e | jne 0x70 // 8d45c4 | lea eax, dword ptr [ebp - 0x3c] // 50 | push eax $sequence_1 = { 733f 2bd7 89550c ff4d0c 8d5114 } // n = 5, score = 100 // 733f | jae 0x41 // 2bd7 | sub edx, edi // 89550c | mov dword ptr [ebp + 0xc], edx // ff4d0c | dec dword ptr [ebp + 0xc] // 8d5114 | lea edx, dword ptr [ecx + 0x14] $sequence_2 = { 8a4603 2440 3c40 0f94c0 884708 } // n = 5, score = 100 // 8a4603 | mov al, byte ptr [esi + 3] // 2440 | and al, 0x40 // 3c40 | cmp al, 0x40 // 0f94c0 | sete al // 884708 | mov byte ptr [edi + 8], al $sequence_3 = { 898a60ffffff 6a23 8d720c 8dba64ffffff 59 03d3 ff4df0 } // n = 7, score = 100 // 898a60ffffff | mov dword ptr [edx - 0xa0], ecx // 6a23 | push 0x23 // 8d720c | lea esi, dword ptr [edx + 0xc] // 8dba64ffffff | lea edi, dword ptr [edx - 0x9c] // 59 | pop ecx // 03d3 | add edx, ebx // ff4df0 | dec dword ptr [ebp - 0x10] $sequence_4 = { c705????????58000000 c705????????3e000000 c705????????a0010000 eb48 837df406 7542 } // n = 6, score = 100 // c705????????58000000 | // c705????????3e000000 | // c705????????a0010000 | // eb48 | jmp 0x4a // 837df406 | cmp dword ptr [ebp - 0xc], 6 // 7542 | jne 0x44 $sequence_5 = { 50 51 ff15???????? 8bf0 897510 3bf3 } // n = 6, score = 100 // 50 | push eax // 51 | push ecx // ff15???????? | // 8bf0 | mov esi, eax // 897510 | mov dword ptr [ebp + 0x10], esi // 3bf3 | cmp esi, ebx $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 = { 68???????? 6a01 8d45dc 50 } // n = 4, score = 100 // 68???????? | // 6a01 | push 1 // 8d45dc | lea eax, dword ptr [ebp - 0x24] // 50 | push eax $sequence_8 = { 6aff 56 50 688e4e0eec } // n = 4, score = 100 // 6aff | push -1 // 56 | push esi // 50 | push eax // 688e4e0eec | push 0xec0e4e8e $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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