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 = "2023-01-25" 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 = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { 7542 8d58b0 498bce 448bc3 488d15b4b50000 e8???????? } // n = 6, score = 100 // 7542 | dec eax // 8d58b0 | lea edx, [0xca21] // 498bce | dec eax // 448bc3 | lea edx, [0x12db6] // 488d15b4b50000 | mov ecx, ebx // e8???????? | $sequence_1 = { 740d 488bc8 49878cff40740200 eb0a 4d87b4ff40740200 33c0 } // n = 6, score = 100 // 740d | dec eax // 488bc8 | lea eax, [0x147a6] // 49878cff40740200 | dec eax // eb0a | mov ecx, dword ptr [esp + 0x30] // 4d87b4ff40740200 | dec eax // 33c0 | cmp ecx, eax $sequence_2 = { 0fb75814 4883c320 66443b7006 733f 4803d8 f7431c00000020 } // n = 6, score = 100 // 0fb75814 | mov ebx, eax // 4883c320 | dec eax // 66443b7006 | test eax, eax // 733f | je 0x3fe // 4803d8 | mov ecx, 0x1fffff // f7431c00000020 | dec eax $sequence_3 = { 44397e18 7e38 498bdf 0f1f4000 660f1f840000000000 488b4e10 488b040b } // n = 7, score = 100 // 44397e18 | mov dword ptr [esp + 0x70], esi // 7e38 | test eax, eax // 498bdf | jne 0x36b // 0f1f4000 | mov dword ptr [esp + 0x40], eax // 660f1f840000000000 | jmp 0x3c3 // 488b4e10 | test eax, eax // 488b040b | jne 0x37e $sequence_4 = { 8bd9 488d1572ef0000 33c9 ff15???????? 85c0 741f 488b4c2438 } // n = 7, score = 100 // 8bd9 | dec eax // 488d1572ef0000 | mov dword ptr [esp + 0x28], eax // 33c9 | dec esp // ff15???????? | // 85c0 | mov dword ptr [esp + 0x20], esi // 741f | mov byte ptr [esp + 0x61], 1 // 488b4c2438 | dec esp $sequence_5 = { 0f1f00 b8abaaaaaa 448bc1 f7e1 c1ea05 8d0452 c1e004 } // n = 7, score = 100 // 0f1f00 | add ecx, ebp // b8abaaaaaa | mov dword ptr [ebx - 4], ecx // 448bc1 | dec esp // f7e1 | mov edi, dword ptr [esp + 0x50] // c1ea05 | jmp 0x61c // 8d0452 | mov ecx, dword ptr [ebx] // c1e004 | dec eax $sequence_6 = { 41b8ffff0000 8bd3 8bc7 2bc3 413bc0 440f42c0 } // n = 6, score = 100 // 41b8ffff0000 | dec eax // 8bd3 | mov edi, eax // 8bc7 | dec eax // 2bc3 | test eax, eax // 413bc0 | je 0x4fe // 440f42c0 | dec eax $sequence_7 = { c744242803000000 4c89742420 ff15???????? 488905???????? 4885c0 7531 488b0d???????? } // n = 7, score = 100 // c744242803000000 | pandn xmm3, xmm5 // 4c89742420 | add edi, 8 // ff15???????? | // 488905???????? | // 4885c0 | movdqa xmm5, xmm0 // 7531 | paddd xmm4, xmm0 // 488b0d???????? | $sequence_8 = { 48ffc0 66833c4700 75f6 4c89b42420060000 4885c0 } // n = 5, score = 100 // 48ffc0 | dec eax // 66833c4700 | lea edx, [esp + 0x40] // 75f6 | mov dword ptr [esp + 0x20], ebp // 4c89b42420060000 | inc ebp // 4885c0 | lea eax, [ecx + 8] $sequence_9 = { 4c2bc7 420fb64cf03e 460fbebc39e0680200 41ffc7 458bef 442bea 4d63d5 } // n = 7, score = 100 // 4c2bc7 | mov ecx, dword ptr [ebp - 0x28] // 420fb64cf03e | inc ebp // 460fbebc39e0680200 | lea eax, [ecx + 4] // 41ffc7 | dec esp // 458bef | mov edi, eax // 442bea | dec eax // 4d63d5 | mov dword ptr [esp + 0x30], eax condition: 7 of them and filesize < 405504 }
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