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rule osx_gmera_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-10-14" version = "1" description = "autogenerated rule brought to you by yara-signator" tool = "yara-signator v0.5.0" signator_config = "callsandjumps;datarefs;binvalue" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/osx.gmera" malpedia_rule_date = "20201014" malpedia_hash = "a7e3bd57eaf12bf3ea29a863c041091ba3af9ac9" malpedia_version = "20201014" 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 = { 8d6de0 48 89df e8???????? 48 } // n = 5, score = 200 // 8d6de0 | lea ebp, [ebp - 0x20] // 48 | dec eax // 89df | mov edi, ebx // e8???????? | // 48 | dec eax $sequence_1 = { 84c0 7509 48 8d7b08 e8???????? 8a4338 84c0 } // n = 7, score = 200 // 84c0 | test al, al // 7509 | jne 0xb // 48 | dec eax // 8d7b08 | lea edi, [ebx + 8] // e8???????? | // 8a4338 | mov al, byte ptr [ebx + 0x38] // 84c0 | test al, al $sequence_2 = { 83ec18 48 89fb 48 8b3d???????? 48 01df } // n = 7, score = 200 // 83ec18 | sub esp, 0x18 // 48 | dec eax // 89fb | mov ebx, edi // 48 | dec eax // 8b3d???????? | // 48 | dec eax // 01df | add edi, ebx $sequence_3 = { 48 83ec10 48 8b3d???????? 4c 01ef 31f6 } // n = 7, score = 200 // 48 | dec eax // 83ec10 | sub esp, 0x10 // 48 | dec eax // 8b3d???????? | // 4c | dec esp // 01ef | add edi, ebp // 31f6 | xor esi, esi $sequence_4 = { 49 c744c73000000000 4c 8b75d0 } // n = 4, score = 200 // 49 | dec ecx // c744c73000000000 | mov dword ptr [edi + eax*8 + 0x30], 0 // 4c | dec esp // 8b75d0 | mov esi, dword ptr [ebp - 0x30] $sequence_5 = { 49 8b3c06 4c 8d6dd0 e8???????? 4c } // n = 6, score = 200 // 49 | dec ecx // 8b3c06 | mov edi, dword ptr [esi + eax] // 4c | dec esp // 8d6dd0 | lea ebp, [ebp - 0x30] // e8???????? | // 4c | dec esp $sequence_6 = { 8b4730 0fb75734 48 83c007 48 bef8ffffff 0100 } // n = 7, score = 200 // 8b4730 | mov eax, dword ptr [edi + 0x30] // 0fb75734 | movzx edx, word ptr [edi + 0x34] // 48 | dec eax // 83c007 | add eax, 7 // 48 | dec eax // bef8ffffff | mov esi, 0xfffffff8 // 0100 | add dword ptr [eax], eax $sequence_7 = { 0100 0000 48 21c1 48 8d045b } // n = 6, score = 200 // 0100 | add dword ptr [eax], eax // 0000 | add byte ptr [eax], al // 48 | dec eax // 21c1 | and ecx, eax // 48 | dec eax // 8d045b | lea eax, [ebx + ebx*2] $sequence_8 = { 89de 4d 89f5 e8???????? 48 } // n = 5, score = 200 // 89de | mov esi, ebx // 4d | dec ebp // 89f5 | mov ebp, esi // e8???????? | // 48 | dec eax $sequence_9 = { 48 8d7de0 31d2 48 } // n = 4, score = 200 // 48 | dec eax // 8d7de0 | lea edi, [ebp - 0x20] // 31d2 | xor edx, edx // 48 | dec eax condition: 7 of them and filesize < 97248 }
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