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rule win_yayih_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-08-05" version = "1" description = "Detects win.yayih." 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.yayih" malpedia_rule_date = "20220805" malpedia_hash = "6ec06c64bcfdbeda64eff021c766b4ce34542b71" malpedia_version = "20220808" 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 = { bf04010000 8d85e8fbffff 57 50 68???????? ff15???????? } // n = 6, score = 100 // bf04010000 | mov edi, 0x104 // 8d85e8fbffff | lea eax, [ebp - 0x418] // 57 | push edi // 50 | push eax // 68???????? | // ff15???????? | $sequence_1 = { e8???????? 53 56 57 6a3f 33db } // n = 6, score = 100 // e8???????? | // 53 | push ebx // 56 | push esi // 57 | push edi // 6a3f | push 0x3f // 33db | xor ebx, ebx $sequence_2 = { ff750c 6a01 57 68???????? ff7508 ff55f8 85c0 } // n = 7, score = 100 // ff750c | push dword ptr [ebp + 0xc] // 6a01 | push 1 // 57 | push edi // 68???????? | // ff7508 | push dword ptr [ebp + 8] // ff55f8 | call dword ptr [ebp - 8] // 85c0 | test eax, eax $sequence_3 = { 56 ff15???????? 8d8558f8ffff 68???????? 50 e8???????? } // n = 6, score = 100 // 56 | push esi // ff15???????? | // 8d8558f8ffff | lea eax, [ebp - 0x7a8] // 68???????? | // 50 | push eax // e8???????? | $sequence_4 = { 5d c3 55 8bec b848470000 } // n = 5, score = 100 // 5d | pop ebp // c3 | ret // 55 | push ebp // 8bec | mov ebp, esp // b848470000 | mov eax, 0x4748 $sequence_5 = { c78578feffff94000000 50 ff15???????? 85c0 7512 68???????? } // n = 6, score = 100 // c78578feffff94000000 | mov dword ptr [ebp - 0x188], 0x94 // 50 | push eax // ff15???????? | // 85c0 | test eax, eax // 7512 | jne 0x14 // 68???????? | $sequence_6 = { ff15???????? 8d85b8b8ffff 68???????? 50 } // n = 4, score = 100 // ff15???????? | // 8d85b8b8ffff | lea eax, [ebp - 0x4748] // 68???????? | // 50 | push eax $sequence_7 = { 57 50 8d85f0fcffff 50 } // n = 4, score = 100 // 57 | push edi // 50 | push eax // 8d85f0fcffff | lea eax, [ebp - 0x310] // 50 | push eax $sequence_8 = { 6a06 ff35???????? ff15???????? 8b45f4 } // n = 4, score = 100 // 6a06 | push 6 // ff35???????? | // ff15???????? | // 8b45f4 | mov eax, dword ptr [ebp - 0xc] $sequence_9 = { ff15???????? ff35???????? ff15???????? 8d85b8b8ffff 68???????? } // n = 5, score = 100 // ff15???????? | // ff35???????? | // ff15???????? | // 8d85b8b8ffff | lea eax, [ebp - 0x4748] // 68???????? | condition: 7 of them and filesize < 57344 }
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