Actor(s): Turla Group
There is no description at this point.
rule win_lightneuron_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" 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 = "20220405" malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a" malpedia_version = "20220411" 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 = { 8b4610 85c0 7405 3b4608 736e 4585c0 } // n = 6, score = 100 // 8b4610 | mov eax, dword ptr [esp + 0x14] // 85c0 | mov dword ptr [esp + 0xc], eax // 7405 | mov eax, dword ptr [esp + 8] // 3b4608 | movzx eax, byte ptr [esp + 0x10] // 736e | cmp eax, 0x3a // 4585c0 | jge 0x1741 $sequence_1 = { 4489742428 85ff 0f85fb020000 488d442420 488d9424c0000000 488d4c2428 897c2420 } // n = 7, score = 100 // 4489742428 | mov edi, ecx // 85ff | dec eax // 0f85fb020000 | mov ecx, edx // 488d442420 | dec eax // 488d9424c0000000 | mov ebx, edx // 488d4c2428 | dec esp // 897c2420 | arpl ax, bx $sequence_2 = { 41c1e108 48895c2420 418b9800020000 440bc8 0fb64103 48896c2428 } // n = 6, score = 100 // 41c1e108 | dec ecx // 48895c2420 | mov ecx, ecx // 418b9800020000 | dec ecx // 440bc8 | mov dword ptr [ebx - 0x88], eax // 0fb64103 | dec eax // 48896c2428 | mov ebx, ecx $sequence_3 = { 488bda 4c8bc2 488bd6 488bcd e8???????? 48c744244800000000 85c0 } // n = 7, score = 100 // 488bda | je 0x1073 // 4c8bc2 | dec eax // 488bd6 | lea ecx, dword ptr [esp + 0x40] // 488bcd | dec eax // e8???????? | // 48c744244800000000 | mov edx, esi // 85c0 | mov edi, eax $sequence_4 = { 48897818 4c8960e8 33f6 4c8968e0 33ff 33ed 4c8970d8 } // n = 7, score = 100 // 48897818 | mov esi, dword ptr [esp + 0x38] // 4c8960e8 | dec eax // 33f6 | test ecx, ecx // 4c8968e0 | je 0x517 // 33ff | dec eax // 33ed | mov dword ptr [ebx + 0x18], ebp // 4c8970d8 | dec eax $sequence_5 = { 7522 488b442460 4883c004 4889442460 488b842480000000 4883c004 4889842480000000 } // n = 7, score = 100 // 7522 | cmp dword ptr [edx], 0 // 488b442460 | jne 0xf87 // 4883c004 | dec eax // 4889442460 | sub edx, 4 // 488b842480000000 | dec eax // 4883c004 | sub eax, 1 // 4889842480000000 | je 0xf9b $sequence_6 = { b900001000 48896c2428 89442420 e8???????? 488bce ff15???????? 4533c9 } // n = 7, score = 100 // b900001000 | cmp dword ptr [esp + 0x20], eax // 48896c2428 | jae 0x1ee6 // 89442420 | mov ecx, dword ptr [esp + 0x20] // e8???????? | // 488bce | dec eax // ff15???????? | // 4533c9 | mov eax, dword ptr [esp + 0x40] $sequence_7 = { 493bdd 7ced 49635cd708 498b14d7 488d4c2438 448bc3 e8???????? } // n = 7, score = 100 // 493bdd | mov ecx, ebx // 7ced | inc ebp // 49635cd708 | xor ecx, ecx // 498b14d7 | inc ebp // 488d4c2438 | xor eax, eax // 448bc3 | mov edx, 0xb0 // e8???????? | $sequence_8 = { 488b05???????? 4c8b05???????? 4885c0 4c0f45c0 ba00100000 488bcb } // n = 6, score = 100 // 488b05???????? | // 4c8b05???????? | // 4885c0 | je 0x487 // 4c0f45c0 | dec ebp // ba00100000 | mov ebp, dword ptr [edi + 8] // 488bcb | dec ecx $sequence_9 = { 69c0b179379e c1e80e 8bc8 488b442428 891488 488b442460 8b00 } // n = 7, score = 100 // 69c0b179379e | mov ecx, edi // c1e80e | dec ebp // 8bc8 | mov ebx, ebp // 488b442428 | dec esp // 891488 | mov esp, ebx // 488b442460 | dec esp // 8b00 | lea esi, dword ptr [0x20709] condition: 7 of them and filesize < 573440 }
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