Actor(s): Turla Group
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rule win_lightneuron_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.lightneuron." 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.lightneuron" malpedia_rule_date = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { e8???????? 8bd8 85c0 757b 4c8d87b8000000 488d542430 488d4c2448 } // n = 7, score = 100 // e8???????? | // 8bd8 | dec eax // 85c0 | mov dword ptr [esp + 0x158], eax // 757b | mov dword ptr [esp + 0x140], ebx // 4c8d87b8000000 | test eax, eax // 488d542430 | mov dword ptr [esp + 0x148], 1 // 488d4c2448 | dec eax $sequence_1 = { f3c3 4885c9 0f84d2000000 48895c2408 57 4883ec20 0fb6fa } // n = 7, score = 100 // f3c3 | mov esp, dword ptr [esp + 0x58] // 4885c9 | dec eax // 0f84d2000000 | mov edi, dword ptr [esp + 0x60] // 48895c2408 | dec eax // 57 | mov ecx, edi // 4883ec20 | mov esi, eax // 0fb6fa | lea ecx, [eax + 1] $sequence_2 = { 7815 488d8c24c8000000 4c8bc3 498bd5 e8???????? eb10 488d8c24c8000000 } // n = 7, score = 100 // 7815 | dec eax // 488d8c24c8000000 | sub ecx, 1 // 4c8bc3 | jne 0x1f6 // 498bd5 | dec ecx // e8???????? | // eb10 | mov eax, ebp // 488d8c24c8000000 | dec ebp $sequence_3 = { 4883c210 4881fa00040000 418b848ec0ed0300 42898432b0e50300 418b848ec0e90300 42898432b0e10300 418b848e80d90300 } // n = 7, score = 100 // 4883c210 | dec ebp // 4881fa00040000 | mov esp, eax // 418b848ec0ed0300 | dec eax // 42898432b0e50300 | mov dword ptr [esp + 0x20], edi // 418b848ec0e90300 | inc ecx // 42898432b0e10300 | push esp // 418b848e80d90300 | dec eax $sequence_4 = { 448b4b28 4183d200 450fb7c1 41c1e910 418bd1 418bc8 440fafce } // n = 7, score = 100 // 448b4b28 | jge 0x15b5 // 4183d200 | dec eax // 450fb7c1 | mov ecx, dword ptr [esp + 0x58] // 41c1e910 | dec eax // 418bd1 | test ecx, ecx // 418bc8 | je 0x1584 // 440fafce | dec eax $sequence_5 = { 85c0 790a 488bcd e8???????? eb49 448b442460 488bd5 } // n = 7, score = 100 // 85c0 | sub ebx, 4 // 790a | shl edx, 8 // 488bcd | or edx, eax // e8???????? | // eb49 | movsx eax, byte ptr [edi + 4] // 448b442460 | shl eax, 0x18 // 488bd5 | shl edx, 8 $sequence_6 = { 895c2420 ba94000000 448bc0 4533c9 b900001000 e8???????? b801000000 } // n = 7, score = 100 // 895c2420 | inc esp // ba94000000 | mov eax, dword ptr [edi + 0x8c] // 448bc0 | inc ebp // 4533c9 | xor ecx, ecx // b900001000 | test eax, eax // e8???????? | // b801000000 | jle 0x159b $sequence_7 = { 89742420 e8???????? 4533c9 4533c0 8bd3 b991010000 4889742420 } // n = 7, score = 100 // 89742420 | inc ecx // e8???????? | // 4533c9 | cmove eax, esp // 4533c0 | mov dword ptr [esp + 0x58], eax // 8bd3 | mov dword ptr [esp + 0x68], eax // b991010000 | test ebx, ebx // 4889742420 | jne 0x1d90 $sequence_8 = { e9???????? 498bce ff15???????? 4533c9 4533c0 baaa000000 b900001000 } // n = 7, score = 100 // e9???????? | // 498bce | mov dword ptr [esp + 0x28], esi // ff15???????? | // 4533c9 | inc esp // 4533c0 | mov eax, dword ptr [edi + 0x8e8] // baaa000000 | inc ebp // b900001000 | xor ecx, ecx $sequence_9 = { 488b5c2468 4883c430 415d 415c 5e c3 803930 } // n = 7, score = 100 // 488b5c2468 | mov eax, 0x10 // 4883c430 | dec eax // 415d | lea edx, [0x1c9f7] // 415c | dec eax // 5e | mov ecx, esi // c3 | dec eax // 803930 | mov ecx, esi condition: 7 of them and filesize < 573440 }
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