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rule win_montysthree_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" 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 = "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 = { ff15???????? 8bf0 3bf3 89754c } // n = 4, score = 200 // ff15???????? | // 8bf0 | mov esi, eax // 3bf3 | cmp esi, ebx // 89754c | mov dword ptr [ebp + 0x4c], esi $sequence_1 = { 8bd4 46 62807013e64e 13e6 d1b660d40c3e } // n = 5, score = 200 // 8bd4 | mov edx, esp // 46 | inc esi // 62807013e64e | bound eax, qword ptr [eax + 0x4ee61370] // 13e6 | adc esp, esi // d1b660d40c3e | sal dword ptr [esi + 0x3e0cd460], 1 $sequence_2 = { 8d4d70 e8???????? ff30 687b020000 57 68???????? e8???????? } // n = 7, score = 200 // 8d4d70 | lea ecx, [ebp + 0x70] // e8???????? | // ff30 | push dword ptr [eax] // 687b020000 | push 0x27b // 57 | push edi // 68???????? | // e8???????? | $sequence_3 = { ff75f0 ffd6 8bc7 f7d8 } // n = 4, score = 200 // ff75f0 | push dword ptr [ebp - 0x10] // ffd6 | call esi // 8bc7 | mov eax, edi // f7d8 | neg eax $sequence_4 = { 50 bf00040000 57 ff15???????? 85c0 8d8574f7ffff 7405 } // n = 7, score = 200 // 50 | push eax // bf00040000 | mov edi, 0x400 // 57 | push edi // ff15???????? | // 85c0 | test eax, eax // 8d8574f7ffff | lea eax, [ebp - 0x88c] // 7405 | je 7 $sequence_5 = { ff7508 53 ff15???????? 53 8d83080a0000 50 } // n = 6, score = 200 // ff7508 | push dword ptr [ebp + 8] // 53 | push ebx // ff15???????? | // 53 | push ebx // 8d83080a0000 | lea eax, [ebx + 0xa08] // 50 | push eax $sequence_6 = { 8d4d28 e8???????? 50 68???????? e8???????? } // n = 5, score = 200 // 8d4d28 | lea ecx, [ebp + 0x28] // e8???????? | // 50 | push eax // 68???????? | // e8???????? | $sequence_7 = { 8933 39753c 8b457c 8930 753d 39756c } // n = 6, score = 200 // 8933 | mov dword ptr [ebx], esi // 39753c | cmp dword ptr [ebp + 0x3c], esi // 8b457c | mov eax, dword ptr [ebp + 0x7c] // 8930 | mov dword ptr [eax], esi // 753d | jne 0x3f // 39756c | cmp dword ptr [ebp + 0x6c], esi $sequence_8 = { e8???????? 8d8570fdffff 50 8d4dc4 } // n = 4, score = 200 // e8???????? | // 8d8570fdffff | lea eax, [ebp - 0x290] // 50 | push eax // 8d4dc4 | lea ecx, [ebp - 0x3c] $sequence_9 = { ff756c ff15???????? 8d4524 50 8d4d4c e8???????? eb25 } // n = 7, score = 200 // ff756c | push dword ptr [ebp + 0x6c] // ff15???????? | // 8d4524 | lea eax, [ebp + 0x24] // 50 | push eax // 8d4d4c | lea ecx, [ebp + 0x4c] // e8???????? | // eb25 | jmp 0x27 condition: 7 of them and filesize < 458752 }
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