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rule win_simda_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" 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 = "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 = { 50 c745fc04010000 a4 e8???????? } // n = 4, score = 700 // 50 | push eax // c745fc04010000 | mov dword ptr [ebp - 4], 0x104 // a4 | movsb byte ptr es:[edi], byte ptr [esi] // e8???????? | $sequence_1 = { 3bce 8945f4 1bc0 40 57 895dfc } // n = 6, score = 700 // 3bce | cmp ecx, esi // 8945f4 | mov dword ptr [ebp - 0xc], eax // 1bc0 | sbb eax, eax // 40 | inc eax // 57 | push edi // 895dfc | mov dword ptr [ebp - 4], ebx $sequence_2 = { c7049f00000000 75f6 8b0f 894d08 } // n = 4, score = 700 // c7049f00000000 | mov dword ptr [edi + ebx*4], 0 // 75f6 | jne 0xfffffff8 // 8b0f | mov ecx, dword ptr [edi] // 894d08 | mov dword ptr [ebp + 8], ecx $sequence_3 = { 760d 8b7d08 83c704 8d4eff 33c0 } // n = 5, score = 700 // 760d | jbe 0xf // 8b7d08 | mov edi, dword ptr [ebp + 8] // 83c704 | add edi, 4 // 8d4eff | lea ecx, [esi - 1] // 33c0 | xor eax, eax $sequence_4 = { c1e110 0b4df4 03d6 83ceff 2bca } // n = 5, score = 700 // c1e110 | shl ecx, 0x10 // 0b4df4 | or ecx, dword ptr [ebp - 0xc] // 03d6 | add edx, esi // 83ceff | or esi, 0xffffffff // 2bca | sub ecx, edx $sequence_5 = { 8b0d???????? 8945d4 a1???????? 8955dc 0fb615???????? } // n = 5, score = 700 // 8b0d???????? | // 8945d4 | mov dword ptr [ebp - 0x2c], eax // a1???????? | // 8955dc | mov dword ptr [ebp - 0x24], edx // 0fb615???????? | $sequence_6 = { c1eb10 3bce 7601 4b c1ef10 } // n = 5, score = 700 // c1eb10 | shr ebx, 0x10 // 3bce | cmp ecx, esi // 7601 | jbe 3 // 4b | dec ebx // c1ef10 | shr edi, 0x10 $sequence_7 = { 83c408 85c0 74e4 6a0a 6a00 56 c60000 } // n = 7, score = 700 // 83c408 | add esp, 8 // 85c0 | test eax, eax // 74e4 | je 0xffffffe6 // 6a0a | push 0xa // 6a00 | push 0 // 56 | push esi // c60000 | mov byte ptr [eax], 0 $sequence_8 = { 8bd1 c1ea10 8955ec 8bf8 } // n = 4, score = 700 // 8bd1 | mov edx, ecx // c1ea10 | shr edx, 0x10 // 8955ec | mov dword ptr [ebp - 0x14], edx // 8bf8 | mov edi, eax $sequence_9 = { 41 eb08 83c102 eb03 83c103 } // n = 5, score = 700 // 41 | inc ecx // eb08 | jmp 0xa // 83c102 | add ecx, 2 // eb03 | jmp 5 // 83c103 | add ecx, 3 condition: 7 of them and filesize < 1581056 }
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