Actor(s): Naikon
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rule win_sys10_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" 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 = "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 = { 56 e8???????? 57 8d542438 53 52 e8???????? } // n = 7, score = 200 // 56 | push esi // e8???????? | // 57 | push edi // 8d542438 | lea edx, [esp + 0x38] // 53 | push ebx // 52 | push edx // e8???????? | $sequence_1 = { 6a03 68???????? 68???????? 51 } // n = 4, score = 200 // 6a03 | push 3 // 68???????? | // 68???????? | // 51 | push ecx $sequence_2 = { 53 33db ff15???????? 33c9 } // n = 4, score = 200 // 53 | push ebx // 33db | xor ebx, ebx // ff15???????? | // 33c9 | xor ecx, ecx $sequence_3 = { 6a03 68???????? 68???????? 51 52 50 ff15???????? } // n = 7, score = 200 // 6a03 | push 3 // 68???????? | // 68???????? | // 51 | push ecx // 52 | push edx // 50 | push eax // ff15???????? | $sequence_4 = { 3df4010000 7305 b8f4010000 8b0d???????? 8b15???????? } // n = 5, score = 200 // 3df4010000 | cmp eax, 0x1f4 // 7305 | jae 7 // b8f4010000 | mov eax, 0x1f4 // 8b0d???????? | // 8b15???????? | $sequence_5 = { 8bf8 ffd3 894610 89442418 8d4608 } // n = 5, score = 200 // 8bf8 | mov edi, eax // ffd3 | call ebx // 894610 | mov dword ptr [esi + 0x10], eax // 89442418 | mov dword ptr [esp + 0x18], eax // 8d4608 | lea eax, [esi + 8] $sequence_6 = { 8b06 8d4c2413 51 6800400000 } // n = 4, score = 200 // 8b06 | mov eax, dword ptr [esi] // 8d4c2413 | lea ecx, [esp + 0x13] // 51 | push ecx // 6800400000 | push 0x4000 $sequence_7 = { e8???????? 83c404 85c0 74c6 8b4c2410 } // n = 5, score = 200 // e8???????? | // 83c404 | add esp, 4 // 85c0 | test eax, eax // 74c6 | je 0xffffffc8 // 8b4c2410 | mov ecx, dword ptr [esp + 0x10] $sequence_8 = { 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_9 = { 8b9640020000 8b06 8d4c2413 51 6800400000 52 50 } // n = 7, score = 200 // 8b9640020000 | mov edx, dword ptr [esi + 0x240] // 8b06 | mov eax, dword ptr [esi] // 8d4c2413 | lea ecx, [esp + 0x13] // 51 | push ecx // 6800400000 | push 0x4000 // 52 | push edx // 50 | push eax condition: 7 of them and filesize < 286720 }
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