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rule win_laziok_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" 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 = "20220513" malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26" malpedia_version = "20220516" 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???????? 6a10 6858020000 e8???????? a3???????? } // n = 5, score = 900 // 68???????? | // 6a10 | push 0x10 // 6858020000 | push 0x258 // e8???????? | // a3???????? | $sequence_1 = { 56 8b742408 833e01 7513 ff7608 ff15???????? 8b460c } // n = 7, score = 900 // 56 | push esi // 8b742408 | mov esi, dword ptr [esp + 8] // 833e01 | cmp dword ptr [esi], 1 // 7513 | jne 0x15 // ff7608 | push dword ptr [esi + 8] // ff15???????? | // 8b460c | mov eax, dword ptr [esi + 0xc] $sequence_2 = { ff15???????? c6043800 8bc7 5f 5e 5d 5b } // n = 7, score = 900 // ff15???????? | // c6043800 | mov byte ptr [eax + edi], 0 // 8bc7 | mov eax, edi // 5f | pop edi // 5e | pop esi // 5d | pop ebp // 5b | pop ebx $sequence_3 = { 56 e8???????? 59 8b4c240c 03c6 8901 8bc6 } // n = 7, score = 900 // 56 | push esi // e8???????? | // 59 | pop ecx // 8b4c240c | mov ecx, dword ptr [esp + 0xc] // 03c6 | add eax, esi // 8901 | mov dword ptr [ecx], eax // 8bc6 | mov eax, esi $sequence_4 = { 57 ff74240c 33f6 ff35???????? e8???????? 8bf8 } // n = 6, score = 900 // 57 | push edi // ff74240c | push dword ptr [esp + 0xc] // 33f6 | xor esi, esi // ff35???????? | // e8???????? | // 8bf8 | mov edi, eax $sequence_5 = { 56 6a00 ff35???????? ff15???????? eb0c 56 83c028 } // n = 7, score = 900 // 56 | push esi // 6a00 | push 0 // ff35???????? | // ff15???????? | // eb0c | jmp 0xe // 56 | push esi // 83c028 | add eax, 0x28 $sequence_6 = { 33f6 e8???????? 59 59 85c0 740a } // n = 6, score = 900 // 33f6 | xor esi, esi // e8???????? | // 59 | pop ecx // 59 | pop ecx // 85c0 | test eax, eax // 740a | je 0xc $sequence_7 = { 8bf8 39742410 741b ff742410 ff15???????? 8bf0 85f6 } // n = 7, score = 900 // 8bf8 | mov edi, eax // 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 condition: 7 of them and filesize < 688128 }
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