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rule win_auriga_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2024-10-31" 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 = "20241030" malpedia_hash = "26e26953c49c8efafbf72a38076855d578e0a2e4" malpedia_version = "20241030" 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 = { 68???????? 56 e8???????? 57 8d85f0f9ffff 50 } // n = 6, score = 100 // 68???????? | // 56 | push esi // e8???????? | // 57 | push edi // 8d85f0f9ffff | lea eax, [ebp - 0x610] // 50 | push eax $sequence_1 = { 8b35???????? ffd6 8945f4 8b45d4 83c002 } // n = 5, score = 100 // 8b35???????? | // ffd6 | call esi // 8945f4 | mov dword ptr [ebp - 0xc], eax // 8b45d4 | mov eax, dword ptr [ebp - 0x2c] // 83c002 | add eax, 2 $sequence_2 = { 7410 6681f96c68 7409 0fb74802 ff3488 } // n = 5, score = 100 // 7410 | je 0x12 // 6681f96c68 | cmp cx, 0x686c // 7409 | je 0xb // 0fb74802 | movzx ecx, word ptr [eax + 2] // ff3488 | push dword ptr [eax + ecx*4] $sequence_3 = { 40 40 663bcf 75ea } // n = 4, score = 100 // 40 | inc eax // 40 | inc eax // 663bcf | cmp cx, di // 75ea | jne 0xffffffec $sequence_4 = { ff15???????? 85c0 7c1e a1???????? } // n = 4, score = 100 // ff15???????? | // 85c0 | test eax, eax // 7c1e | jl 0x20 // a1???????? | $sequence_5 = { 7518 ffb5f8fbffff 8b35???????? ffd6 ffb5f4fbffff ffd6 33c0 } // n = 7, score = 100 // 7518 | jne 0x1a // ffb5f8fbffff | push dword ptr [ebp - 0x408] // 8b35???????? | // ffd6 | call esi // ffb5f4fbffff | push dword ptr [ebp - 0x40c] // ffd6 | call esi // 33c0 | xor eax, eax $sequence_6 = { 8b0d???????? 03c1 3900 74f0 8b15???????? 56 } // n = 6, score = 100 // 8b0d???????? | // 03c1 | add eax, ecx // 3900 | cmp dword ptr [eax], eax // 74f0 | je 0xfffffff2 // 8b15???????? | // 56 | push esi $sequence_7 = { 8b5a1c 03dd 8b048b 03c5 8944241c 61 } // n = 6, score = 100 // 8b5a1c | mov ebx, dword ptr [edx + 0x1c] // 03dd | add ebx, ebp // 8b048b | mov eax, dword ptr [ebx + ecx*4] // 03c5 | add eax, ebp // 8944241c | mov dword ptr [esp + 0x1c], eax // 61 | popal $sequence_8 = { 0f8ce7010000 8d85e8f9ffff 50 8d85e0f9ffff } // n = 4, score = 100 // 0f8ce7010000 | jl 0x1ed // 8d85e8f9ffff | lea eax, [ebp - 0x618] // 50 | push eax // 8d85e0f9ffff | lea eax, [ebp - 0x620] $sequence_9 = { 33c0 8945e4 8945f0 8945f4 8d45e0 } // n = 5, score = 100 // 33c0 | xor eax, eax // 8945e4 | mov dword ptr [ebp - 0x1c], eax // 8945f0 | mov dword ptr [ebp - 0x10], eax // 8945f4 | mov dword ptr [ebp - 0xc], eax // 8d45e0 | lea eax, [ebp - 0x20] condition: 7 of them and filesize < 75776 }
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