Actor(s): Naikon
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rule win_sys10_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" version = "1" description = "Detects win.sys10." 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.sys10" malpedia_rule_date = "20220405" malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a" malpedia_version = "20220411" 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 = { ff15???????? 85c0 7406 33c0 83c40c c3 8b442408 } // n = 7, score = 200 // ff15???????? | // 85c0 | test eax, eax // 7406 | je 8 // 33c0 | xor eax, eax // 83c40c | add esp, 0xc // c3 | ret // 8b442408 | mov eax, dword ptr [esp + 8] $sequence_1 = { 8b06 50 e8???????? 8b442418 } // n = 4, score = 200 // 8b06 | mov eax, dword ptr [esi] // 50 | push eax // e8???????? | // 8b442418 | mov eax, dword ptr [esp + 0x18] $sequence_2 = { 53 33db ff15???????? 33c9 89442408 66894c2404 } // n = 6, score = 200 // 53 | push ebx // 33db | xor ebx, ebx // ff15???????? | // 33c9 | xor ecx, ecx // 89442408 | mov dword ptr [esp + 8], eax // 66894c2404 | mov word ptr [esp + 4], cx $sequence_3 = { e8???????? 83c404 85c0 74c6 8b4c2410 896e10 } // n = 6, score = 200 // e8???????? | // 83c404 | add esp, 4 // 85c0 | test eax, eax // 74c6 | je 0xffffffc8 // 8b4c2410 | mov ecx, dword ptr [esp + 0x10] // 896e10 | mov dword ptr [esi + 0x10], ebp $sequence_4 = { 6810270000 ff15???????? 33c0 59 c20c00 8b442410 c70044020000 } // n = 7, score = 200 // 6810270000 | push 0x2710 // ff15???????? | // 33c0 | xor eax, eax // 59 | pop ecx // c20c00 | ret 0xc // 8b442410 | mov eax, dword ptr [esp + 0x10] // c70044020000 | mov dword ptr [eax], 0x244 $sequence_5 = { 55 8b2d???????? 56 8b742418 57 8b3d???????? a801 } // n = 7, score = 200 // 55 | push ebp // 8b2d???????? | // 56 | push esi // 8b742418 | mov esi, dword ptr [esp + 0x18] // 57 | push edi // 8b3d???????? | // a801 | test al, 1 $sequence_6 = { e8???????? 68e8030000 ff15???????? 6800280000 } // n = 4, score = 200 // e8???????? | // 68e8030000 | push 0x3e8 // ff15???????? | // 6800280000 | push 0x2800 $sequence_7 = { 897c2434 894c242c 89742438 ff15???????? 6aff } // n = 5, score = 200 // 897c2434 | mov dword ptr [esp + 0x34], edi // 894c242c | mov dword ptr [esp + 0x2c], ecx // 89742438 | mov dword ptr [esp + 0x38], esi // ff15???????? | // 6aff | push -1 $sequence_8 = { 6810270000 ff15???????? 33c0 59 } // n = 4, score = 200 // 6810270000 | push 0x2710 // ff15???????? | // 33c0 | xor eax, eax // 59 | pop ecx $sequence_9 = { 59 c20c00 8b442410 c70044020000 } // n = 4, score = 200 // 59 | pop ecx // c20c00 | ret 0xc // 8b442410 | mov eax, dword ptr [esp + 0x10] // c70044020000 | mov dword ptr [eax], 0x244 condition: 7 of them and filesize < 286720 }
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