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rule win_simda_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" 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 = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { 0faf5dfc 8bfa c1e710 0b7df4 3bdf } // n = 5, score = 700 // 0faf5dfc | imul ebx, dword ptr [ebp - 4] // 8bfa | mov edi, edx // c1e710 | shl edi, 0x10 // 0b7df4 | or edi, dword ptr [ebp - 0xc] // 3bdf | cmp ebx, edi $sequence_1 = { 8b5508 83c40c 803a00 0f8491000000 53 8bda } // n = 6, score = 700 // 8b5508 | mov edx, dword ptr [ebp + 8] // 83c40c | add esp, 0xc // 803a00 | cmp byte ptr [edx], 0 // 0f8491000000 | je 0x97 // 53 | push ebx // 8bda | mov ebx, edx $sequence_2 = { 33d2 3b7dec 7519 8b5dfc } // n = 4, score = 700 // 33d2 | xor edx, edx // 3b7dec | cmp edi, dword ptr [ebp - 0x14] // 7519 | jne 0x1b // 8b5dfc | mov ebx, dword ptr [ebp - 4] $sequence_3 = { 0fb7c8 0fafd1 8bf9 c1e810 0faffb } // n = 5, score = 700 // 0fb7c8 | movzx ecx, ax // 0fafd1 | imul edx, ecx // 8bf9 | mov edi, ecx // c1e810 | shr eax, 0x10 // 0faffb | imul edi, ebx $sequence_4 = { 8d95f5fdffff 33c9 53 52 } // n = 4, score = 700 // 8d95f5fdffff | lea edx, [ebp - 0x20b] // 33c9 | xor ecx, ecx // 53 | push ebx // 52 | push edx $sequence_5 = { 6803010000 33c9 8d95edfdffff 56 52 } // n = 5, score = 700 // 6803010000 | push 0x103 // 33c9 | xor ecx, ecx // 8d95edfdffff | lea edx, [ebp - 0x213] // 56 | push esi // 52 | push edx $sequence_6 = { 03c7 3bc7 7301 42 } // n = 4, score = 700 // 03c7 | add eax, edi // 3bc7 | cmp eax, edi // 7301 | jae 3 // 42 | inc edx $sequence_7 = { 7c02 33c0 41 81f900010000 7ce4 } // n = 5, score = 700 // 7c02 | jl 4 // 33c0 | xor eax, eax // 41 | inc ecx // 81f900010000 | cmp ecx, 0x100 // 7ce4 | jl 0xffffffe6 $sequence_8 = { ffd7 8b1d???????? 6a00 6a01 8d8df8feffff } // n = 5, score = 700 // ffd7 | call edi // 8b1d???????? | // 6a00 | push 0 // 6a01 | push 1 // 8d8df8feffff | lea ecx, [ebp - 0x108] $sequence_9 = { a1???????? 8dbc35c8fcffff 03d7 81e201000080 7905 } // n = 5, score = 700 // a1???????? | // 8dbc35c8fcffff | lea edi, [ebp + esi - 0x338] // 03d7 | add edx, edi // 81e201000080 | and edx, 0x80000001 // 7905 | jns 7 condition: 7 of them and filesize < 1581056 }
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