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rule win_simda_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.simda." 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.simda" 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 = { 8955ec 897de0 3bce 0f8278feffff 5b } // n = 5, score = 700 // 8955ec | mov dword ptr [ebp - 0x14], edx // 897de0 | mov dword ptr [ebp - 0x20], edi // 3bce | cmp ecx, esi // 0f8278feffff | jb 0xfffffe7e // 5b | pop ebx $sequence_1 = { 8d642400 8a13 33c0 33c9 668945f8 8845fa 66894dfc } // n = 7, score = 700 // 8d642400 | lea esp, [esp] // 8a13 | mov dl, byte ptr [ebx] // 33c0 | xor eax, eax // 33c9 | xor ecx, ecx // 668945f8 | mov word ptr [ebp - 8], ax // 8845fa | mov byte ptr [ebp - 6], al // 66894dfc | mov word ptr [ebp - 4], cx $sequence_2 = { 51 c685f8feffff00 e8???????? 8b35???????? } // n = 4, score = 700 // 51 | push ecx // c685f8feffff00 | mov byte ptr [ebp - 0x108], 0 // e8???????? | // 8b35???????? | $sequence_3 = { 33f6 68ff000000 8d85f1feffff 56 50 } // n = 5, score = 700 // 33f6 | xor esi, esi // 68ff000000 | push 0xff // 8d85f1feffff | lea eax, [ebp - 0x10f] // 56 | push esi // 50 | push eax $sequence_4 = { 8b7510 57 e8???????? 57 8bf3 e8???????? } // n = 6, score = 700 // 8b7510 | mov esi, dword ptr [ebp + 0x10] // 57 | push edi // e8???????? | // 57 | push edi // 8bf3 | mov esi, ebx // e8???????? | $sequence_5 = { 52 ffd7 85c0 740c 68???????? } // n = 5, score = 700 // 52 | push edx // ffd7 | call edi // 85c0 | test eax, eax // 740c | je 0xe // 68???????? | $sequence_6 = { 7518 d1e8 85d0 7515 d1e8 85d0 } // n = 6, score = 700 // 7518 | jne 0x1a // d1e8 | shr eax, 1 // 85d0 | test eax, edx // 7515 | jne 0x17 // d1e8 | shr eax, 1 // 85d0 | test eax, edx $sequence_7 = { b910000000 be???????? 8d7db4 f3a5 66a5 } // n = 5, score = 700 // b910000000 | mov ecx, 0x10 // be???????? | // 8d7db4 | lea edi, [ebp - 0x4c] // f3a5 | rep movsd dword ptr es:[edi], dword ptr [esi] // 66a5 | movsw word ptr es:[edi], word ptr [esi] $sequence_8 = { 81ec08010000 56 8d45fc 33f6 } // n = 4, score = 700 // 81ec08010000 | sub esp, 0x108 // 56 | push esi // 8d45fc | lea eax, [ebp - 4] // 33f6 | xor esi, esi $sequence_9 = { 6a08 ffd3 8bf0 83feff } // n = 4, score = 700 // 6a08 | push 8 // ffd3 | call ebx // 8bf0 | mov esi, eax // 83feff | cmp esi, -1 condition: 7 of them and filesize < 1581056 }
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