Actor(s): Lazarus Group
There is no description at this point.
rule win_lazardoor_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" 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 = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { 488bd1 488bc1 48c1f806 4c8d05f4f60000 } // n = 4, score = 200 // 488bd1 | dec eax // 488bc1 | arpl cx, cx // 48c1f806 | dec eax // 4c8d05f4f60000 | lea edx, [0x12cb4] $sequence_1 = { 428a8c3998a50100 482bd0 8b42fc d3e8 443bc8 0f8d09010000 488b4b28 } // n = 7, score = 200 // 428a8c3998a50100 | add esp, 0x20 // 482bd0 | pop edi // 8b42fc | ret // d3e8 | inc eax // 443bc8 | push ebx // 0f8d09010000 | dec eax // 488b4b28 | sub esp, 0x40 $sequence_2 = { 4053 4883ec20 488d05575a0100 488bd9 488901 f6c201 740a } // n = 7, score = 200 // 4053 | lea eax, [0x29b6f] // 4883ec20 | test eax, eax // 488d05575a0100 | jne 0x583 // 488bd9 | dec eax // 488901 | test eax, eax // f6c201 | jne 0x5aa // 740a | dec esp $sequence_3 = { 8905???????? 0f1105???????? 8b15???????? 4533c9 488b0d???????? 4533c0 } // n = 6, score = 200 // 8905???????? | // 0f1105???????? | // 8b15???????? | // 4533c9 | dec esp // 488b0d???????? | // 4533c0 | lea eax, [0xff52] $sequence_4 = { 4d85c0 7410 488d15615b0200 488bc8 } // n = 4, score = 200 // 4d85c0 | dec eax // 7410 | mov dword ptr [esp + 0x40], eax // 488d15615b0200 | dec eax // 488bc8 | test eax, eax $sequence_5 = { 44392d???????? 743d 4533c9 4c896c2430 c744242880000000 } // n = 5, score = 200 // 44392d???????? | // 743d | lea eax, [ecx - 1] // 4533c9 | cmp eax, 0x9fffff // 4c896c2430 | mov edx, dword ptr [eax] // c744242880000000 | dec eax $sequence_6 = { 660f6e5cc610 660f62d8 660f6fc7 660f6cda 660ffec4 660f76de } // n = 6, score = 200 // 660f6e5cc610 | lea ebx, [0x114b3] // 660f62d8 | dec ebp // 660f6fc7 | test ecx, ecx // 660f6cda | dec eax // 660ffec4 | lea edi, [0x446b] // 660f76de | dec eax $sequence_7 = { 33d2 e8???????? 3bc3 7565 03fb 8b1d???????? 3bfb } // n = 7, score = 200 // 33d2 | dec eax // e8???????? | // 3bc3 | cmp ecx, eax // 7565 | je 0x1c2 // 03fb | nop // 8b1d???????? | // 3bfb | jne 0x1d1 $sequence_8 = { ba5a540000 e9???????? 8b05???????? 85c0 } // n = 4, score = 200 // ba5a540000 | sub eax, eax // e9???????? | // 8b05???????? | // 85c0 | inc ecx $sequence_9 = { 4c8bc1 b84d5a0000 66390525b6ffff 7578 48630d58b6ffff 488d1515b6ffff 4803ca } // n = 7, score = 200 // 4c8bc1 | mov esi, dword ptr [esp + 0x28] // b84d5a0000 | dec eax // 66390525b6ffff | mov ecx, dword ptr [esi] // 7578 | inc esp // 48630d58b6ffff | mov esi, eax // 488d1515b6ffff | dec eax // 4803ca | mov edi, dword ptr [esi + 8] condition: 7 of them and filesize < 405504 }
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