Actor(s): Lazarus Group
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rule win_lazardoor_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.lazardoor." 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.lazardoor" 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 = { 4883ec38 488d05e5ab0000 41b91b000000 4889442420 e8???????? } // n = 5, score = 100 // 4883ec38 | cmp edi, dword ptr [ecx + 6] // 488d05e5ab0000 | jae 0x29b // 41b91b000000 | dec eax // 4889442420 | add edi, ecx // e8???????? | $sequence_1 = { 8905???????? 486305???????? 4869d008020000 48c7c0ffffffff 4803d6 } // n = 5, score = 100 // 8905???????? | // 486305???????? | // 4869d008020000 | lea eax, [0xfffea017] // 48c7c0ffffffff | dec edx // 4803d6 | mov edx, dword ptr [eax + 0x27630] $sequence_2 = { e8???????? 488d4da0 c745a01c010000 ff15???????? 85c0 } // n = 5, score = 100 // e8???????? | // 488d4da0 | mov dword ptr [esp + 0x20], eax // c745a01c010000 | dec ecx // ff15???????? | // 85c0 | mov ecx, edi $sequence_3 = { 4c8bdc 55 56 4155 4157 498dabf8feffff 4881ece8010000 } // n = 7, score = 100 // 4c8bdc | jne 0x1199 // 55 | dec eax // 56 | mov dword ptr [esp + 0x20], ebx // 4155 | test eax, eax // 4157 | je 0x1178 // 498dabf8feffff | dec ebp // 4881ece8010000 | test esp, esp $sequence_4 = { 8bfd 8d41ff 3dffff9f00 0f8727010000 8bd1 b940000000 ff15???????? } // n = 7, score = 100 // 8bfd | inc ecx // 8d41ff | push edi // 3dffff9f00 | dec eax // 0f8727010000 | sub esp, 0x20 // 8bd1 | dec ecx // b940000000 | mov esi, ecx // ff15???????? | $sequence_5 = { 4883ec20 488d05ef2c0100 488bf9 488901 8bda 4883c108 } // n = 6, score = 100 // 4883ec20 | inc esp // 488d05ef2c0100 | mov dword ptr [esp + 0x48], ebp // 488bf9 | inc ecx // 488901 | mov eax, 0x104 // 8bda | inc ebp // 4883c108 | mov esi, ebp $sequence_6 = { 48c1f806 488d0d68130100 4183e23f 4903e8 498bf0 } // n = 5, score = 100 // 48c1f806 | dec eax // 488d0d68130100 | lea ecx, [0x2a282] // 4183e23f | inc esp // 4903e8 | lea esi, [edx*4 + 0x68] // 498bf0 | inc ecx $sequence_7 = { 813d????????dcf79f00 761c 498bce ff15???????? 498bcf ff15???????? ba5a540000 } // n = 7, score = 100 // 813d????????dcf79f00 | // 761c | movsx eax, byte ptr [ecx + esi + 0x1a588] // 498bce | inc edx // ff15???????? | // 498bcf | mov cl, byte ptr [ecx + esi + 0x1a598] // ff15???????? | // ba5a540000 | dec esp $sequence_8 = { 488d0d0bdf0000 488b45d8 488908 488d0dad860100 488b45d8 8990a8030000 488b45d8 } // n = 7, score = 100 // 488d0d0bdf0000 | inc esp // 488b45d8 | mov esi, eax // 488908 | dec eax // 488d0dad860100 | mov edi, dword ptr [esi + 8] // 488b45d8 | movzx ebx, word ptr [ecx + 0x14] // 8990a8030000 | dec eax // 488b45d8 | add ebx, 0x24 $sequence_9 = { 488b03 4885c0 7419 4533c0 488bcf 418d5001 ffd0 } // n = 7, score = 100 // 488b03 | inc ecx // 4885c0 | add esi, -0x22 // 7419 | dec ebp // 4533c0 | test eax, eax // 488bcf | inc ecx // 418d5001 | mov bl, 1 // ffd0 | dec esp condition: 7 of them and filesize < 405504 }
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