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rule win_laziok_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" 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 = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { e8???????? 8bf8 39742410 741b } // n = 4, score = 900 // e8???????? | // 8bf8 | mov edi, eax // 39742410 | cmp dword ptr [esp + 0x10], esi // 741b | je 0x1d $sequence_1 = { 03c6 8901 8bc6 5e } // n = 4, score = 900 // 03c6 | add eax, esi // 8901 | mov dword ptr [ecx], eax // 8bc6 | mov eax, esi // 5e | pop esi $sequence_2 = { 50 51 68ffffff1f 52 e8???????? 83c410 c3 } // n = 7, score = 900 // 50 | push eax // 51 | push ecx // 68ffffff1f | push 0x1fffffff // 52 | push edx // e8???????? | // 83c410 | add esp, 0x10 // c3 | ret $sequence_3 = { 6a00 ff35???????? ff15???????? eb0c 56 83c028 50 } // n = 7, score = 900 // 6a00 | push 0 // ff35???????? | // ff15???????? | // eb0c | jmp 0xe // 56 | push esi // 83c028 | add eax, 0x28 // 50 | push eax $sequence_4 = { e8???????? 68???????? 6a00 6a0c a3???????? } // n = 5, score = 900 // e8???????? | // 68???????? | // 6a00 | push 0 // 6a0c | push 0xc // a3???????? | $sequence_5 = { 56 e8???????? 59 8b4c240c 03c6 8901 } // n = 6, 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 $sequence_6 = { 5f 5e 5b c20c00 8b08 } // n = 5, score = 900 // 5f | pop edi // 5e | pop esi // 5b | pop ebx // c20c00 | ret 0xc // 8b08 | mov ecx, dword ptr [eax] $sequence_7 = { 668945f2 8b460c 85c0 7404 8b00 eb03 8b4610 } // n = 7, score = 900 // 668945f2 | mov word ptr [ebp - 0xe], ax // 8b460c | mov eax, dword ptr [esi + 0xc] // 85c0 | test eax, eax // 7404 | je 6 // 8b00 | mov eax, dword ptr [eax] // eb03 | jmp 5 // 8b4610 | mov eax, dword ptr [esi + 0x10] $sequence_8 = { 83c028 50 e8???????? 59 59 5e c20400 } // n = 7, score = 900 // 83c028 | add eax, 0x28 // 50 | push eax // e8???????? | // 59 | pop ecx // 59 | pop ecx // 5e | pop esi // c20400 | ret 4 $sequence_9 = { e8???????? 83c420 5b c20400 } // n = 4, score = 900 // e8???????? | // 83c420 | add esp, 0x20 // 5b | pop ebx // c20400 | ret 4 condition: 7 of them and filesize < 688128 }
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