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rule win_subzero_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" 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 = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { 99 2bc2 d1f8 f7d8 8bc8 e9???????? 8bc2 } // n = 7, score = 100 // 99 | nop dword ptr [eax + eax] // 2bc2 | dec eax // d1f8 | mov dword ptr [esp + 0x50], ebx // f7d8 | inc ebp // 8bc8 | movzx eax, byte ptr [ebp] // e9???????? | // 8bc2 | inc ebp $sequence_1 = { c6411800 498bcb 498b5108 488b5208 e8???????? 498b4108 e9???????? } // n = 7, score = 100 // c6411800 | nop dword ptr [eax + eax] // 498bcb | dec eax // 498b5108 | and dword ptr [ebx + 0x10], 0 // 488b5208 | dec eax // e8???????? | // 498b4108 | mov ecx, ebx // e9???????? | $sequence_2 = { 33db 48ff15???????? 0f1f440000 85c0 7409 8a5c2424 f6d3 } // n = 7, score = 100 // 33db | dec esp // 48ff15???????? | // 0f1f440000 | mov esi, edx // 85c0 | dec eax // 7409 | mov ebx, ecx // 8a5c2424 | jne 0x15152 // f6d3 | dec eax $sequence_3 = { e8???????? 488b4b30 4885c9 7405 e8???????? 488b4b10 4885c9 } // n = 7, score = 100 // e8???????? | // 488b4b30 | sub eax, ecx // 4885c9 | mov dword ptr [ebp - 0xd], 2 // 7405 | dec ecx // e8???????? | // 488b4b10 | mov ecx, dword ptr [edx + 0x20] // 4885c9 | mov dword ptr [ebp - 1], 0x3c $sequence_4 = { 48ff15???????? 0f1f440000 8b55a8 2b55a0 8b4dac 2b4da4 2b4c2450 } // n = 7, score = 100 // 48ff15???????? | // 0f1f440000 | nop dword ptr [eax + eax] // 8b55a8 | or eax, 0xff000000 // 2b55a0 | dec esp // 8b4dac | mov dword ptr [ebp + 0x77], ebp // 2b4da4 | xor edx, edx // 2b4c2450 | inc ebp $sequence_5 = { 0f2945f7 f20f104dc7 f20f114d07 0f1045cf 0f294517 f20f104ddf f20f114d27 } // n = 7, score = 100 // 0f2945f7 | dec ecx // f20f104dc7 | mov dword ptr [esi + 0xf0], ebp // f20f114d07 | dec ecx // 0f1045cf | mov dword ptr [esi + 0xf8], ebp // 0f294517 | dec ecx // f20f104ddf | mov dword ptr [esi + 0x100], ebp // f20f114d27 | inc cx $sequence_6 = { f7d3 81e305400080 488d4c2420 e8???????? 488b742458 8bc3 488b5c2450 } // n = 7, score = 100 // f7d3 | je 0x14a1 // 81e305400080 | cmp byte ptr [ebx + 0x5ac], 0 // 488d4c2420 | dec eax // e8???????? | // 488b742458 | lea edx, [esp + 0x58] // 8bc3 | dec eax // 488b5c2450 | mov ecx, ebp $sequence_7 = { 498bca e8???????? 8bd8 488d4da7 e8???????? 85db 791d } // n = 7, score = 100 // 498bca | mov dword ptr [ebp - 0x10], eax // e8???????? | // 8bd8 | dec ecx // 488d4da7 | mov esi, ecx // e8???????? | // 85db | dec ebp // 791d | mov esi, eax $sequence_8 = { 488b01 488b4038 ff15???????? 90 488d4de0 e8???????? 85ff } // n = 7, score = 100 // 488b01 | dec eax // 488b4038 | lea ecx, [esp + 0x60] // ff15???????? | // 90 | nop // 488d4de0 | dec eax // e8???????? | // 85ff | lea ecx, [esp + 0x70] $sequence_9 = { e8???????? 488b4b30 4c8d442458 33d2 e8???????? 488b4c2450 408af8 } // n = 7, score = 100 // e8???????? | // 488b4b30 | lea eax, [0x11e2f] // 4c8d442458 | dec eax // 33d2 | mov dword ptr [ebx + 0x10], eax // e8???????? | // 488b4c2450 | dec eax // 408af8 | test ecx, ecx condition: 7 of them and filesize < 1420288 }
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