Actor(s): Lazarus Group
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rule win_lazarus_killdisk_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.lazarus_killdisk." 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.lazarus_killdisk" malpedia_rule_date = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { c745f802000000 ff15???????? 6a00 6a02 ff15???????? 8bf0 89b5bcfeffff } // n = 7, score = 200 // c745f802000000 | mov dword ptr [ebp - 8], 2 // ff15???????? | // 6a00 | push 0 // 6a02 | push 2 // ff15???????? | // 8bf0 | mov esi, eax // 89b5bcfeffff | mov dword ptr [ebp - 0x144], esi $sequence_1 = { 7405 83f802 7543 8a442410 } // n = 4, score = 200 // 7405 | je 7 // 83f802 | cmp eax, 2 // 7543 | jne 0x45 // 8a442410 | mov al, byte ptr [esp + 0x10] $sequence_2 = { 8b560c 8945e8 8b4604 8945ec 894df0 } // n = 5, score = 200 // 8b560c | mov edx, dword ptr [esi + 0xc] // 8945e8 | mov dword ptr [ebp - 0x18], eax // 8b4604 | mov eax, dword ptr [esi + 4] // 8945ec | mov dword ptr [ebp - 0x14], eax // 894df0 | mov dword ptr [ebp - 0x10], ecx $sequence_3 = { 57 8945f0 ff15???????? 3b45f0 7517 6a00 } // n = 6, score = 200 // 57 | push edi // 8945f0 | mov dword ptr [ebp - 0x10], eax // ff15???????? | // 3b45f0 | cmp eax, dword ptr [ebp - 0x10] // 7517 | jne 0x19 // 6a00 | push 0 $sequence_4 = { c785e4fdffff00000000 8d75a6 8b06 8b4e08 8b560c 8945e8 8b4604 } // n = 7, score = 200 // c785e4fdffff00000000 | mov dword ptr [ebp - 0x21c], 0 // 8d75a6 | lea esi, [ebp - 0x5a] // 8b06 | mov eax, dword ptr [esi] // 8b4e08 | mov ecx, dword ptr [esi + 8] // 8b560c | mov edx, dword ptr [esi + 0xc] // 8945e8 | mov dword ptr [ebp - 0x18], eax // 8b4604 | mov eax, dword ptr [esi + 4] $sequence_5 = { 8945f8 8b4508 53 8b5808 56 } // n = 5, score = 200 // 8945f8 | mov dword ptr [ebp - 8], eax // 8b4508 | mov eax, dword ptr [ebp + 8] // 53 | push ebx // 8b5808 | mov ebx, dword ptr [eax + 8] // 56 | push esi $sequence_6 = { e8???????? 8d442454 83c410 33f6 } // n = 4, score = 200 // e8???????? | // 8d442454 | lea eax, [esp + 0x54] // 83c410 | add esp, 0x10 // 33f6 | xor esi, esi $sequence_7 = { 8b4dfc ff0d???????? 33cd 83c410 } // n = 4, score = 200 // 8b4dfc | mov ecx, dword ptr [ebp - 4] // ff0d???????? | // 33cd | xor ecx, ebp // 83c410 | add esp, 0x10 $sequence_8 = { 8b4da6 8b55ae 8945e8 8b45aa } // n = 4, score = 200 // 8b4da6 | mov ecx, dword ptr [ebp - 0x5a] // 8b55ae | mov edx, dword ptr [ebp - 0x52] // 8945e8 | mov dword ptr [ebp - 0x18], eax // 8b45aa | mov eax, dword ptr [ebp - 0x56] $sequence_9 = { c1e009 51 50 57 8945f0 89b5e4fdffff } // n = 6, score = 200 // c1e009 | shl eax, 9 // 51 | push ecx // 50 | push eax // 57 | push edi // 8945f0 | mov dword ptr [ebp - 0x10], eax // 89b5e4fdffff | mov dword ptr [ebp - 0x21c], esi condition: 7 of them and filesize < 209920 }
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