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rule win_cloudwizard_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.cloudwizard." 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.cloudwizard" 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 = { ff15???????? 85c0 7417 ff15???????? 8945fc } // n = 5, score = 100 // ff15???????? | // 85c0 | test eax, eax // 7417 | je 0x19 // ff15???????? | // 8945fc | mov dword ptr [ebp - 4], eax $sequence_1 = { 58 6a47 66894564 58 66894568 6a5f 58 } // n = 7, score = 100 // 58 | pop eax // 6a47 | push 0x47 // 66894564 | mov word ptr [ebp + 0x64], ax // 58 | pop eax // 66894568 | mov word ptr [ebp + 0x68], ax // 6a5f | push 0x5f // 58 | pop eax $sequence_2 = { 75c1 e9???????? 8bb5c4fdffff e9???????? 8b00 } // n = 5, score = 100 // 75c1 | jne 0xffffffc3 // e9???????? | // 8bb5c4fdffff | mov esi, dword ptr [ebp - 0x23c] // e9???????? | // 8b00 | mov eax, dword ptr [eax] $sequence_3 = { c645c35a c645c447 c645c546 c645c645 c645c74d } // n = 5, score = 100 // c645c35a | mov byte ptr [ebp - 0x3d], 0x5a // c645c447 | mov byte ptr [ebp - 0x3c], 0x47 // c645c546 | mov byte ptr [ebp - 0x3b], 0x46 // c645c645 | mov byte ptr [ebp - 0x3a], 0x45 // c645c74d | mov byte ptr [ebp - 0x39], 0x4d $sequence_4 = { 33f6 57 ff15???????? 8bc6 ebd4 8b85dcfdffff 3b462c } // n = 7, score = 100 // 33f6 | xor esi, esi // 57 | push edi // ff15???????? | // 8bc6 | mov eax, esi // ebd4 | jmp 0xffffffd6 // 8b85dcfdffff | mov eax, dword ptr [ebp - 0x224] // 3b462c | cmp eax, dword ptr [esi + 0x2c] $sequence_5 = { 668945de 58 6a4d 668945e0 58 6a4e } // n = 6, score = 100 // 668945de | mov word ptr [ebp - 0x22], ax // 58 | pop eax // 6a4d | push 0x4d // 668945e0 | mov word ptr [ebp - 0x20], ax // 58 | pop eax // 6a4e | push 0x4e $sequence_6 = { 58 6a69 668945ea 58 6a7a 668945ec } // n = 6, score = 100 // 58 | pop eax // 6a69 | push 0x69 // 668945ea | mov word ptr [ebp - 0x16], ax // 58 | pop eax // 6a7a | push 0x7a // 668945ec | mov word ptr [ebp - 0x14], ax $sequence_7 = { 59 3bfb 7406 33c0 ab } // n = 5, score = 100 // 59 | pop ecx // 3bfb | cmp edi, ebx // 7406 | je 8 // 33c0 | xor eax, eax // ab | stosd dword ptr es:[edi], eax $sequence_8 = { 668945dc 58 6a66 668945de } // n = 4, score = 100 // 668945dc | mov word ptr [ebp - 0x24], ax // 58 | pop eax // 6a66 | push 0x66 // 668945de | mov word ptr [ebp - 0x22], ax $sequence_9 = { c9 c3 55 8d6c2488 81ec9c040000 } // n = 5, score = 100 // c9 | leave // c3 | ret // 55 | push ebp // 8d6c2488 | lea ebp, [esp - 0x78] // 81ec9c040000 | sub esp, 0x49c condition: 7 of them and filesize < 134144 }
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