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rule win_obscene_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.obscene." 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.obscene" malpedia_rule_date = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { 51 ff7510 ff750c ff15???????? 59 59 } // n = 6, score = 100 // 51 | push ecx // ff7510 | push dword ptr [ebp + 0x10] // ff750c | push dword ptr [ebp + 0xc] // ff15???????? | // 59 | pop ecx // 59 | pop ecx $sequence_1 = { 80a012109a0000 68???????? e8???????? 59 68???????? } // n = 5, score = 100 // 80a012109a0000 | and byte ptr [eax + 0x9a1012], 0 // 68???????? | // e8???????? | // 59 | pop ecx // 68???????? | $sequence_2 = { e8???????? 59 59 68???????? 68???????? 8d85ecf6ffff 50 } // n = 7, score = 100 // e8???????? | // 59 | pop ecx // 59 | pop ecx // 68???????? | // 68???????? | // 8d85ecf6ffff | lea eax, [ebp - 0x914] // 50 | push eax $sequence_3 = { 8b4508 0fbe00 83f841 7c0b 8b4508 } // n = 5, score = 100 // 8b4508 | mov eax, dword ptr [ebp + 8] // 0fbe00 | movsx eax, byte ptr [eax] // 83f841 | cmp eax, 0x41 // 7c0b | jl 0xd // 8b4508 | mov eax, dword ptr [ebp + 8] $sequence_4 = { 50 e8???????? 59 6800511010 8d85ecf6ffff 50 } // n = 6, score = 100 // 50 | push eax // e8???????? | // 59 | pop ecx // 6800511010 | push 0x10105100 // 8d85ecf6ffff | lea eax, [ebp - 0x914] // 50 | push eax $sequence_5 = { 8b4508 0345fc 894508 e9???????? 33c0 5e } // n = 6, score = 100 // 8b4508 | mov eax, dword ptr [ebp + 8] // 0345fc | add eax, dword ptr [ebp - 4] // 894508 | mov dword ptr [ebp + 8], eax // e9???????? | // 33c0 | xor eax, eax // 5e | pop esi $sequence_6 = { c20c00 55 8bec 6a00 ff35???????? } // n = 5, score = 100 // c20c00 | ret 0xc // 55 | push ebp // 8bec | mov ebp, esp // 6a00 | push 0 // ff35???????? | $sequence_7 = { 0fbe00 83f839 7e4b 8b45f8 0fbe00 } // n = 5, score = 100 // 0fbe00 | movsx eax, byte ptr [eax] // 83f839 | cmp eax, 0x39 // 7e4b | jle 0x4d // 8b45f8 | mov eax, dword ptr [ebp - 8] // 0fbe00 | movsx eax, byte ptr [eax] $sequence_8 = { 68ec421010 ff35???????? 6aff ff15???????? } // n = 4, score = 100 // 68ec421010 | push 0x101042ec // ff35???????? | // 6aff | push -1 // ff15???????? | $sequence_9 = { ffb5eef7ffff ff15???????? 0fb7c0 83f819 } // n = 4, score = 100 // ffb5eef7ffff | push dword ptr [ebp - 0x812] // ff15???????? | // 0fb7c0 | movzx eax, ax // 83f819 | cmp eax, 0x19 condition: 7 of them and filesize < 2170880 }
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