Actor(s): Lazarus Group
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rule win_lcpdot_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.lcpdot." 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.lcpdot" malpedia_rule_date = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { 488b7c2430 4533c9 4533c0 33d2 488bcf 89742438 ff15???????? } // n = 7, score = 100 // 488b7c2430 | mov dword ptr [ebp + 0x90], 0 // 4533c9 | dec eax // 4533c0 | mov dword ptr [ebp + 0x98], 0 // 33d2 | dec eax // 488bcf | mov dword ptr [ebp + 0x78], 0 // 89742438 | dec eax // ff15???????? | $sequence_1 = { 48895808 e8???????? 33c0 488b5c2440 4883c430 5f } // n = 6, score = 100 // 48895808 | mov ecx, edi // e8???????? | // 33c0 | dec eax // 488b5c2440 | sar ecx, 5 // 4883c430 | inc ecx // 5f | and ebx, 0x1f $sequence_2 = { 4533c9 897c2428 897c2420 48897c2430 e8???????? 85c0 7518 } // n = 7, score = 100 // 4533c9 | jne 0x6d1 // 897c2428 | dec eax // 897c2420 | mov ecx, eax // 48897c2430 | mov dword ptr [esp + 0x48], 3 // e8???????? | // 85c0 | dec eax // 7518 | mov dword ptr [esp + 0x50], edi $sequence_3 = { 488b4c2448 4533c9 458d4104 488d5608 ff15???????? 4c8b442448 488b4c2440 } // n = 7, score = 100 // 488b4c2448 | dec esp // 4533c9 | mov eax, dword ptr [ecx] // 458d4104 | mov edx, 1 // 488d5608 | inc ecx // ff15???????? | // 4c8b442448 | call dword ptr [eax] // 488b4c2440 | dec eax $sequence_4 = { 4883ec28 e8???????? 4885c0 7509 488d05df2e0100 eb04 } // n = 6, score = 100 // 4883ec28 | mov eax, dword ptr [ebx + 8] // e8???????? | // 4885c0 | dec esp // 7509 | mov dword ptr [eax], ebx // 488d05df2e0100 | inc ecx // eb04 | cmp ebx, esp $sequence_5 = { 488d0d4fde0000 e8???????? 85c0 755a } // n = 4, score = 100 // 488d0d4fde0000 | mov dword ptr [esp + 0x72], eax // e8???????? | // 85c0 | mov word ptr [esp + 0x76], ax // 755a | inc sp $sequence_6 = { 7408 8bcb ff15???????? e8???????? 488d157ede0000 } // n = 5, score = 100 // 7408 | dec eax // 8bcb | add edx, esi // ff15???????? | // e8???????? | // 488d157ede0000 | inc esp $sequence_7 = { 48897010 57 4883ec60 488bf1 44894018 498bf9 488bda } // n = 7, score = 100 // 48897010 | lea ebx, [esp + 0x30] // 57 | dec eax // 4883ec60 | sub ebx, eax // 488bf1 | nop word ptr [eax + eax] // 44894018 | inc ecx // 498bf9 | movzx eax, byte ptr [ebx] // 488bda | dec ecx $sequence_8 = { e8???????? 85c0 745d 8b5c2438 } // n = 4, score = 100 // e8???????? | // 85c0 | dec eax // 745d | mov edi, ebp // 8b5c2438 | dec ecx $sequence_9 = { 741e 448b4538 4585c0 7415 488d153f320100 488d8c2440020000 ff15???????? } // n = 7, score = 100 // 741e | mov dword ptr [ebp + 8], 0xff // 448b4538 | dec eax // 4585c0 | mov dword ptr [ebp + 0x10], 0 // 7415 | dec eax // 488d153f320100 | mov dword ptr [ebp + 0x18], 0 // 488d8c2440020000 | mov dword ptr [ecx + 0xc8], 1 // ff15???????? | condition: 7 of them and filesize < 257024 }
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