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rule win_subzero_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.subzero." 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.subzero" 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 = { 4c8d4c2460 4c8bc6 488b13 e8???????? 488b4c2458 85c0 0f8831bb0100 } // n = 7, score = 100 // 4c8d4c2460 | dec eax // 4c8bc6 | mov ecx, dword ptr [edi] // 488b13 | dec eax // e8???????? | // 488b4c2458 | mov dword ptr [ecx], eax // 85c0 | dec eax // 0f8831bb0100 | and dword ptr [edi], 0 $sequence_1 = { 488bc7 ff15???????? 8bd8 85c0 0f889e360200 498b5f78 488b03 } // n = 7, score = 100 // 488bc7 | and dword ptr [esp + 0x34], 0 // ff15???????? | // 8bd8 | inc ebp // 85c0 | xor ecx, ecx // 0f889e360200 | dec eax // 498b5f78 | and dword ptr [ecx + 0x590], 0 // 488b03 | inc ecx $sequence_2 = { e8???????? 4c8d5c2450 8bc3 498b5b20 498b6b28 498b7330 498be3 } // n = 7, score = 100 // e8???????? | // 4c8d5c2450 | lea eax, [0x184d9] // 8bc3 | dec eax // 498b5b20 | mov dword ptr [ebp + 0x200], eax // 498b6b28 | dec eax // 498b7330 | lea edx, [ebp - 0x80] // 498be3 | dec eax $sequence_3 = { 488d542448 488d4c2450 e8???????? 8bd8 85c0 0f886c770100 488b4c2448 } // n = 7, score = 100 // 488d542448 | dec esp // 488d4c2450 | mov eax, dword ptr [esi] // e8???????? | // 8bd8 | dec eax // 85c0 | mov ecx, eax // 0f886c770100 | dec eax // 488b4c2448 | mov edi, eax $sequence_4 = { e8???????? eb0c 488b03 33db 488987d8000000 4885f6 740f } // n = 7, score = 100 // e8???????? | // eb0c | dec eax // 488b03 | mov dword ptr [esp + 0x28], eax // 33db | dec eax // 488987d8000000 | lea eax, [ebp - 0x80] // 4885f6 | dec eax // 740f | lea eax, [ebp - 0x74] $sequence_5 = { e8???????? 90 8bc7 488b5c2458 4883c430 415e 5f } // n = 7, score = 100 // e8???????? | // 90 | dec eax // 8bc7 | lea ecx, [ebx + 8] // 488b5c2458 | dec eax // 4883c430 | lea eax, [ebp + 0x20] // 415e | dec eax // 5f | mov dword ptr [esp + 0x28], eax $sequence_6 = { e8???????? 8bd8 85c0 7956 488b4d5f 448bc8 4c8d05c1470500 } // n = 7, score = 100 // e8???????? | // 8bd8 | lea eax, [esp + 0x48] // 85c0 | xor edx, edx // 7956 | dec esp // 488b4d5f | lea ecx, [0x1643a] // 448bc8 | dec eax // 4c8d05c1470500 | mov dword ptr [esp + 0x20], eax $sequence_7 = { 90 488d05e6f20500 48894310 8b4b28 85c9 0f85978c0300 488d4b30 } // n = 7, score = 100 // 90 | dec esp // 488d05e6f20500 | mov dword ptr [eax - 0x28], edi // 48894310 | dec eax // 8b4b28 | cmp esi, ebx // 85c9 | je 0x21c50 // 0f85978c0300 | dec eax // 488d4b30 | mov eax, ebx $sequence_8 = { 7406 e8???????? 90 488b4b08 4885c9 7406 e8???????? } // n = 7, score = 100 // 7406 | dec eax // e8???????? | // 90 | mov dword ptr [edi + 0x10], eax // 488b4b08 | dec edx // 4885c9 | lea eax, [ebx + esi*8] // 7406 | dec eax // e8???????? | $sequence_9 = { bb05400080 4885c9 7411 4c8975cf 488b01 488b4010 ff15???????? } // n = 7, score = 100 // bb05400080 | dec eax // 4885c9 | mov edx, esi // 7411 | dec eax // 4c8975cf | mov eax, dword ptr [ecx] // 488b01 | dec eax // 488b4010 | mov eax, dword ptr [eax + 0x28] // ff15???????? | condition: 7 of them and filesize < 1420288 }
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