Actor(s): Lazarus Group
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rule win_cloudburst_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.cloudburst." 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.cloudburst" 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 = { 4533c2 4133e8 45894424f8 41896c24fc 8bc5 } // n = 5, score = 300 // 4533c2 | lea edi, [0xc24d5] // 4133e8 | dec eax // 45894424f8 | mov esi, ebx // 41896c24fc | dec eax // 8bc5 | lea edi, [0xc22d7] $sequence_1 = { 4883ec08 8b05???????? 41be01000000 4c892c24 85c0 } // n = 5, score = 300 // 4883ec08 | movzx ecx, byte ptr [esi] // 8b05???????? | // 41be01000000 | movzx eax, cl // 4c892c24 | and al, 0xc0 // 85c0 | cmp al, 0x80 $sequence_2 = { 4c892c24 85c0 4c8bd9 4c8bd2 410f44c6 4533ed } // n = 6, score = 300 // 4c892c24 | xor ebx, ebx // 85c0 | nop dword ptr [eax + eax] // 4c8bd9 | dec esp // 4c8bd2 | mov edi, dword ptr [ebp] // 410f44c6 | dec ebp // 4533ed | mov esi, dword ptr [esp] $sequence_3 = { 488b0d???????? 488d542444 4533c9 4533c0 488bf8 418bdd ff15???????? } // n = 7, score = 300 // 488b0d???????? | // 488d542444 | mov dword ptr [esp + 0x50], ebp // 4533c9 | mov byte ptr [esp + 0x40], al // 4533c0 | inc esp // 488bf8 | lea eax, [eax + 7] // 418bdd | dec eax // ff15???????? | $sequence_4 = { 458942f4 458b4c24f8 418bc1 c1e818 } // n = 4, score = 300 // 458942f4 | xor ecx, eax // 458b4c24f8 | inc esp // 418bc1 | xor ecx, ecx // c1e818 | test edx, edx $sequence_5 = { ba00080000 488bcb e8???????? 4c8d442430 } // n = 4, score = 300 // ba00080000 | mov eax, dword ptr [edi + esi*8 + 0x10] // 488bcb | dec esp // e8???????? | // 4c8d442430 | lea esi, [eax + eax*2] $sequence_6 = { 8b05???????? 41be01000000 4c892c24 85c0 4c8bd9 } // n = 5, score = 300 // 8b05???????? | // 41be01000000 | arpl word ptr [edi + ebp*8 + 4], cx // 4c892c24 | dec eax // 85c0 | mov dword ptr [ebp - 0x38], esi // 4c8bd9 | dec eax $sequence_7 = { 03c2 8bc8 83e00f 3bc2 7407 } // n = 5, score = 300 // 03c2 | lea ecx, [ebp + 0x80] // 8bc8 | jne 0x13e8 // 83e00f | dec eax // 3bc2 | lea edx, [0xc0c18] // 7407 | dec eax $sequence_8 = { 33d6 41891424 4133d3 33fa 4189542404 33df 41897c2408 } // n = 7, score = 300 // 33d6 | jmp ecx // 41891424 | dec esp // 4133d3 | lea ecx, [0xbed79] // 33fa | dec eax // 4189542404 | lea edx, [0x15e74] // 33df | dec eax // 41897c2408 | mov ecx, esi $sequence_9 = { 41b904000000 4c8d442440 418d5101 ff15???????? 85c0 74b1 } // n = 6, score = 300 // 41b904000000 | dec eax // 4c8d442440 | mov ecx, dword ptr [esp + 0x60] // 418d5101 | inc esp // ff15???????? | // 85c0 | mov eax, edi // 74b1 | dec eax condition: 7 of them and filesize < 2363392 }
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