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rule win_apocalipto_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.apocalipto." 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.apocalipto" 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 = { 85c0 0f84c2090000 c7442404???????? 891c24 ff15???????? 83ec08 } // n = 6, score = 100 // 85c0 | test eax, eax // 0f84c2090000 | je 0x9c8 // c7442404???????? | // 891c24 | mov dword ptr [esp], ebx // ff15???????? | // 83ec08 | sub esp, 8 $sequence_1 = { a3???????? 85c0 0f8459070000 c7442404???????? 891c24 ff15???????? 83ec08 } // n = 7, score = 100 // a3???????? | // 85c0 | test eax, eax // 0f8459070000 | je 0x75f // c7442404???????? | // 891c24 | mov dword ptr [esp], ebx // ff15???????? | // 83ec08 | sub esp, 8 $sequence_2 = { 7367 8b450c c1e810 668945d8 } // n = 4, score = 100 // 7367 | jae 0x69 // 8b450c | mov eax, dword ptr [ebp + 0xc] // c1e810 | shr eax, 0x10 // 668945d8 | mov word ptr [ebp - 0x28], ax $sequence_3 = { 83ec08 a3???????? 85c0 0f84a7070000 c7442404???????? } // n = 5, score = 100 // 83ec08 | sub esp, 8 // a3???????? | // 85c0 | test eax, eax // 0f84a7070000 | je 0x7ad // c7442404???????? | $sequence_4 = { 893c24 e8???????? 89c2 85c0 7430 8b85c8f3ffff } // n = 6, score = 100 // 893c24 | mov dword ptr [esp], edi // e8???????? | // 89c2 | mov edx, eax // 85c0 | test eax, eax // 7430 | je 0x32 // 8b85c8f3ffff | mov eax, dword ptr [ebp - 0xc38] $sequence_5 = { 39c6 7367 8b450c c1e810 668945d8 31c0 } // n = 6, score = 100 // 39c6 | cmp esi, eax // 7367 | jae 0x69 // 8b450c | mov eax, dword ptr [ebp + 0xc] // c1e810 | shr eax, 0x10 // 668945d8 | mov word ptr [ebp - 0x28], ax // 31c0 | xor eax, eax $sequence_6 = { a3???????? 85c0 0f84480b0000 c7442404???????? 891c24 ff15???????? 83ec08 } // n = 7, score = 100 // a3???????? | // 85c0 | test eax, eax // 0f84480b0000 | je 0xb4e // c7442404???????? | // 891c24 | mov dword ptr [esp], ebx // ff15???????? | // 83ec08 | sub esp, 8 $sequence_7 = { c744240800400000 897c2404 893424 ff15???????? 83ec0c 31f6 e9???????? } // n = 7, score = 100 // c744240800400000 | mov dword ptr [esp + 8], 0x4000 // 897c2404 | mov dword ptr [esp + 4], edi // 893424 | mov dword ptr [esp], esi // ff15???????? | // 83ec0c | sub esp, 0xc // 31f6 | xor esi, esi // e9???????? | $sequence_8 = { 890424 e8???????? 83f83f 7e41 c7442408c0000000 8b550c } // n = 6, score = 100 // 890424 | mov dword ptr [esp], eax // e8???????? | // 83f83f | cmp eax, 0x3f // 7e41 | jle 0x43 // c7442408c0000000 | mov dword ptr [esp + 8], 0xc0 // 8b550c | mov edx, dword ptr [ebp + 0xc] $sequence_9 = { 8944240c c744240800000000 c744240400000000 8b45d4 890424 ff15???????? 83ec1c } // n = 7, score = 100 // 8944240c | mov dword ptr [esp + 0xc], eax // c744240800000000 | mov dword ptr [esp + 8], 0 // c744240400000000 | mov dword ptr [esp + 4], 0 // 8b45d4 | mov eax, dword ptr [ebp - 0x2c] // 890424 | mov dword ptr [esp], eax // ff15???????? | // 83ec1c | sub esp, 0x1c condition: 7 of them and filesize < 212992 }
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