Actor(s): Lazarus Group
There is no description at this point.
rule osx_yort_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.yort" 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 = { 31f6 ba02000000 4c 89ef e8???????? 4c 89ef } // n = 7, score = 100 // 31f6 | xor esi, esi // ba02000000 | mov edx, 2 // 4c | dec esp // 89ef | mov edi, ebp // e8???????? | // 4c | dec esp // 89ef | mov edi, ebp $sequence_1 = { 6381a00a0000 48 69c0???????? 48 8d740154 4c } // n = 6, score = 100 // 6381a00a0000 | arpl word ptr [ecx + 0xaa0], ax // 48 | dec eax // 69c0???????? | // 48 | dec eax // 8d740154 | lea esi, [ecx + eax + 0x54] // 4c | dec esp $sequence_2 = { 8d740654 48 8dbd78faffff 48 8b9560baffff } // n = 5, score = 100 // 8d740654 | lea esi, [esi + eax + 0x54] // 48 | dec eax // 8dbd78faffff | lea edi, [ebp - 0x588] // 48 | dec eax // 8b9560baffff | mov edx, dword ptr [ebp - 0x45a0] $sequence_3 = { 81fc???????? b8???????? 41 0f42c4 49 } // n = 5, score = 100 // 81fc???????? | // b8???????? | // 41 | inc ecx // 0f42c4 | cmovb eax, esp // 49 | dec ecx $sequence_4 = { 8bbd50baffff 4c 89e1 e8???????? 85c0 4c } // n = 6, score = 100 // 8bbd50baffff | mov edi, dword ptr [ebp - 0x45b0] // 4c | dec esp // 89e1 | mov ecx, esp // e8???????? | // 85c0 | test eax, eax // 4c | dec esp $sequence_5 = { 31ff ba06000000 45 31c0 4c 89f1 e8???????? } // n = 7, score = 100 // 31ff | xor edi, edi // ba06000000 | mov edx, 6 // 45 | inc ebp // 31c0 | xor eax, eax // 4c | dec esp // 89f1 | mov ecx, esi // e8???????? | $sequence_6 = { 0f8cd0040000 31c0 e8???????? 0385607affff 39c3 } // n = 5, score = 100 // 0f8cd0040000 | jl 0x4d6 // 31c0 | xor eax, eax // e8???????? | // 0385607affff | add eax, dword ptr [ebp - 0x85a0] // 39c3 | cmp ebx, eax $sequence_7 = { 49 638424a00a0000 48 69c0???????? 49 8d740454 49 } // n = 7, score = 100 // 49 | dec ecx // 638424a00a0000 | arpl word ptr [esp + 0xaa0], ax // 48 | dec eax // 69c0???????? | // 49 | dec ecx // 8d740454 | lea esi, [esp + eax + 0x54] // 49 | dec ecx $sequence_8 = { 8b00 48 3b45e0 0f85a3000000 } // n = 4, score = 100 // 8b00 | mov eax, dword ptr [eax] // 48 | dec eax // 3b45e0 | cmp eax, dword ptr [ebp - 0x20] // 0f85a3000000 | jne 0xa9 $sequence_9 = { 48 8db5587affff e8???????? 89c3 31c0 } // n = 5, score = 100 // 48 | dec eax // 8db5587affff | lea esi, [ebp - 0x85a8] // e8???????? | // 89c3 | mov ebx, eax // 31c0 | xor eax, eax condition: 7 of them and filesize < 57768 }
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