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rule win_yayih_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { 8d4580 50 68???????? e8???????? 8b35???????? 83c40c } // n = 6, score = 100 // 8d4580 | lea eax, [ebp - 0x80] // 50 | push eax // 68???????? | // e8???????? | // 8b35???????? | // 83c40c | add esp, 0xc $sequence_1 = { 8d85e0f9ffff 50 e8???????? 8d45b8 50 8d85e0f9ffff } // n = 6, score = 100 // 8d85e0f9ffff | lea eax, [ebp - 0x620] // 50 | push eax // e8???????? | // 8d45b8 | lea eax, [ebp - 0x48] // 50 | push eax // 8d85e0f9ffff | lea eax, [ebp - 0x620] $sequence_2 = { 85c0 56 7509 56 56 6a01 } // n = 6, score = 100 // 85c0 | test eax, eax // 56 | push esi // 7509 | jne 0xb // 56 | push esi // 56 | push esi // 6a01 | push 1 $sequence_3 = { 0f844b010000 8d45ac 8b3d???????? 50 8d45ec 50 8d45f0 } // n = 7, score = 100 // 0f844b010000 | je 0x151 // 8d45ac | lea eax, [ebp - 0x54] // 8b3d???????? | // 50 | push eax // 8d45ec | lea eax, [ebp - 0x14] // 50 | push eax // 8d45f0 | lea eax, [ebp - 0x10] $sequence_4 = { 59 33c0 8dbde9faffff 889de8faffff f3ab } // n = 5, score = 100 // 59 | pop ecx // 33c0 | xor eax, eax // 8dbde9faffff | lea edi, [ebp - 0x517] // 889de8faffff | mov byte ptr [ebp - 0x518], bl // f3ab | rep stosd dword ptr es:[edi], eax $sequence_5 = { 83650800 8b550c 8d78ff 59 85ff } // n = 5, score = 100 // 83650800 | and dword ptr [ebp + 8], 0 // 8b550c | mov edx, dword ptr [ebp + 0xc] // 8d78ff | lea edi, [eax - 1] // 59 | pop ecx // 85ff | test edi, edi $sequence_6 = { 740c 39b57cffffff 0f856e0e0000 817dc8c8000000 0f853f010000 6a44 } // n = 6, score = 100 // 740c | je 0xe // 39b57cffffff | cmp dword ptr [ebp - 0x84], esi // 0f856e0e0000 | jne 0xe74 // 817dc8c8000000 | cmp dword ptr [ebp - 0x38], 0xc8 // 0f853f010000 | jne 0x145 // 6a44 | push 0x44 $sequence_7 = { 81ff00200000 c7450800200000 7303 897d08 ff7508 } // n = 5, score = 100 // 81ff00200000 | cmp edi, 0x2000 // c7450800200000 | mov dword ptr [ebp + 8], 0x2000 // 7303 | jae 5 // 897d08 | mov dword ptr [ebp + 8], edi // ff7508 | push dword ptr [ebp + 8] $sequence_8 = { c745fce0930400 ff15???????? 53 53 53 53 } // n = 6, score = 100 // c745fce0930400 | mov dword ptr [ebp - 4], 0x493e0 // ff15???????? | // 53 | push ebx // 53 | push ebx // 53 | push ebx // 53 | push ebx $sequence_9 = { 8bec 83ec14 8065ec00 56 57 } // n = 5, score = 100 // 8bec | mov ebp, esp // 83ec14 | sub esp, 0x14 // 8065ec00 | and byte ptr [ebp - 0x14], 0 // 56 | push esi // 57 | push edi condition: 7 of them and filesize < 57344 }
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