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rule win_simda_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" 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 = "20220513" malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26" malpedia_version = "20220516" 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 = { 57 e8???????? 8b7510 57 e8???????? } // n = 5, score = 700 // 57 | push edi // e8???????? | // 8b7510 | mov esi, dword ptr [ebp + 0x10] // 57 | push edi // 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 = { 85db 7412 03c3 3bc3 7305 } // n = 5, score = 700 // 85db | test ebx, ebx // 7412 | je 0x14 // 03c3 | add eax, ebx // 3bc3 | cmp eax, ebx // 7305 | jae 7 $sequence_3 = { 6804010000 68???????? 8d85f8feffff 50 ffd6 6804010000 68???????? } // n = 7, score = 700 // 6804010000 | push 0x104 // 68???????? | // 8d85f8feffff | lea eax, [ebp - 0x108] // 50 | push eax // ffd6 | call esi // 6804010000 | push 0x104 // 68???????? | $sequence_4 = { ff15???????? 85c0 740d f6450802 7507 56 } // n = 6, score = 700 // ff15???????? | // 85c0 | test eax, eax // 740d | je 0xf // f6450802 | test byte ptr [ebp + 8], 2 // 7507 | jne 9 // 56 | push esi $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 = { 7305 ba01000000 c745fc00000000 8b5d08 8934bb 8b7510 8945d8 } // n = 7, score = 700 // 7305 | jae 7 // ba01000000 | mov edx, 1 // c745fc00000000 | mov dword ptr [ebp - 4], 0 // 8b5d08 | mov ebx, dword ptr [ebp + 8] // 8934bb | mov dword ptr [ebx + edi*4], esi // 8b7510 | mov esi, dword ptr [ebp + 0x10] // 8945d8 | mov dword ptr [ebp - 0x28], eax $sequence_7 = { ffd7 83c408 85c0 74e4 6a0a 6a00 } // n = 6, score = 700 // ffd7 | call edi // 83c408 | add esp, 8 // 85c0 | test eax, eax // 74e4 | je 0xffffffe6 // 6a0a | push 0xa // 6a00 | push 0 $sequence_8 = { c1eb10 3bce 7601 4b c1ef10 2bdf 5f } // n = 7, score = 700 // c1eb10 | shr ebx, 0x10 // 3bce | cmp ecx, esi // 7601 | jbe 3 // 4b | dec ebx // c1ef10 | shr edi, 0x10 // 2bdf | sub ebx, edi // 5f | pop edi $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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