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rule win_montysthree_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" version = "1" description = "Detects win.montysthree." 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.montysthree" malpedia_rule_date = "20220513" malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26" malpedia_version = "20220516" 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???????? 3bc7 7e07 8b0e } // n = 4, score = 200 // ff15???????? | // 3bc7 | cmp eax, edi // 7e07 | jle 9 // 8b0e | mov ecx, dword ptr [esi] $sequence_1 = { e8???????? 8d4d18 e8???????? 83f804 7e26 834d6001 68???????? } // n = 7, score = 200 // e8???????? | // 8d4d18 | lea ecx, [ebp + 0x18] // e8???????? | // 83f804 | cmp eax, 4 // 7e26 | jle 0x28 // 834d6001 | or dword ptr [ebp + 0x60], 1 // 68???????? | $sequence_2 = { 89754c 7543 ff15???????? 8bf8 57 8d4d70 e8???????? } // n = 7, score = 200 // 89754c | mov dword ptr [ebp + 0x4c], esi // 7543 | jne 0x45 // ff15???????? | // 8bf8 | mov edi, eax // 57 | push edi // 8d4d70 | lea ecx, [ebp + 0x70] // e8???????? | $sequence_3 = { 397578 740b ff7578 8d4df8 e8???????? 8d4df8 897564 } // n = 7, score = 200 // 397578 | cmp dword ptr [ebp + 0x78], esi // 740b | je 0xd // ff7578 | push dword ptr [ebp + 0x78] // 8d4df8 | lea ecx, [ebp - 8] // e8???????? | // 8d4df8 | lea ecx, [ebp - 8] // 897564 | mov dword ptr [ebp + 0x64], esi $sequence_4 = { e8???????? 83c40c 8bd8 8d442418 50 ff742418 } // n = 6, score = 200 // e8???????? | // 83c40c | add esp, 0xc // 8bd8 | mov ebx, eax // 8d442418 | lea eax, [esp + 0x18] // 50 | push eax // ff742418 | push dword ptr [esp + 0x18] $sequence_5 = { 33db 3bc3 7539 ff15???????? 8bf0 56 8d4d08 } // n = 7, score = 200 // 33db | xor ebx, ebx // 3bc3 | cmp eax, ebx // 7539 | jne 0x3b // ff15???????? | // 8bf0 | mov esi, eax // 56 | push esi // 8d4d08 | lea ecx, [ebp + 8] $sequence_6 = { e8???????? ff35???????? e8???????? 53 8bf8 } // n = 5, score = 200 // e8???????? | // ff35???????? | // e8???????? | // 53 | push ebx // 8bf8 | mov edi, eax $sequence_7 = { e8???????? 59 57 e8???????? 59 8d4dd8 } // n = 6, score = 200 // e8???????? | // 59 | pop ecx // 57 | push edi // e8???????? | // 59 | pop ecx // 8d4dd8 | lea ecx, [ebp - 0x28] $sequence_8 = { 57 ff15???????? 33c9 6a02 40 5a f7e2 } // n = 7, score = 200 // 57 | push edi // ff15???????? | // 33c9 | xor ecx, ecx // 6a02 | push 2 // 40 | inc eax // 5a | pop edx // f7e2 | mul edx $sequence_9 = { 8bc1 83600800 83600c00 c700???????? c3 } // n = 5, score = 200 // 8bc1 | mov eax, ecx // 83600800 | and dword ptr [eax + 8], 0 // 83600c00 | and dword ptr [eax + 0xc], 0 // c700???????? | // c3 | ret condition: 7 of them and filesize < 458752 }
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