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rule win_laziok_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2024-10-31" version = "1" description = "Detects win.laziok." 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.laziok" 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 = { 39742410 741b ff742410 ff15???????? 8bf0 85f6 } // n = 6, score = 900 // 39742410 | cmp dword ptr [esp + 0x10], esi // 741b | je 0x1d // ff742410 | push dword ptr [esp + 0x10] // ff15???????? | // 8bf0 | mov esi, eax // 85f6 | test esi, esi $sequence_1 = { 59 85f6 7410 46 } // n = 4, score = 900 // 59 | pop ecx // 85f6 | test esi, esi // 7410 | je 0x12 // 46 | inc esi $sequence_2 = { ff750c ff7608 ff15???????? eb3f 6a02 58 } // n = 6, score = 900 // ff750c | push dword ptr [ebp + 0xc] // ff7608 | push dword ptr [esi + 8] // ff15???????? | // eb3f | jmp 0x41 // 6a02 | push 2 // 58 | pop eax $sequence_3 = { 837c240cff 8937 7502 8bf7 5f 8bc6 } // n = 6, score = 900 // 837c240cff | cmp dword ptr [esp + 0xc], -1 // 8937 | mov dword ptr [edi], esi // 7502 | jne 4 // 8bf7 | mov esi, edi // 5f | pop edi // 8bc6 | mov eax, esi $sequence_4 = { 833e01 7513 6a00 ff7510 ff750c } // n = 5, score = 900 // 833e01 | cmp dword ptr [esi], 1 // 7513 | jne 0x15 // 6a00 | push 0 // ff7510 | push dword ptr [ebp + 0x10] // ff750c | push dword ptr [ebp + 0xc] $sequence_5 = { 2bc6 d1f8 83f801 7d03 } // n = 4, score = 900 // 2bc6 | sub eax, esi // d1f8 | sar eax, 1 // 83f801 | cmp eax, 1 // 7d03 | jge 5 $sequence_6 = { 2bc6 d1f8 83f901 7d07 } // n = 4, score = 900 // 2bc6 | sub eax, esi // d1f8 | sar eax, 1 // 83f901 | cmp ecx, 1 // 7d07 | jge 9 $sequence_7 = { 7404 8b00 eb03 8b4610 } // n = 4, score = 900 // 7404 | je 6 // 8b00 | mov eax, dword ptr [eax] // eb03 | jmp 5 // 8b4610 | mov eax, dword ptr [esi + 0x10] condition: 7 of them and filesize < 688128 }
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