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rule win_obscene_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" 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 = "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 = { 6a06 68fc421010 ff35???????? 6aff ff15???????? ff7520 } // n = 6, score = 100 // 6a06 | push 6 // 68fc421010 | push 0x101042fc // ff35???????? | // 6aff | push -1 // ff15???????? | // ff7520 | push dword ptr [ebp + 0x20] $sequence_1 = { 68e4401010 e8???????? 59 80a0e240101000 68e4401010 e8???????? 59 } // n = 7, score = 100 // 68e4401010 | push 0x101040e4 // e8???????? | // 59 | pop ecx // 80a0e240101000 | and byte ptr [eax + 0x101040e2], 0 // 68e4401010 | push 0x101040e4 // e8???????? | // 59 | pop ecx $sequence_2 = { 59 6820431010 68e4401010 e8???????? 59 59 85c0 } // n = 7, score = 100 // 59 | pop ecx // 6820431010 | push 0x10104320 // 68e4401010 | push 0x101040e4 // e8???????? | // 59 | pop ecx // 59 | pop ecx // 85c0 | test eax, eax $sequence_3 = { 0fbe00 83f809 7416 8b45fc 0fbe00 83f80d } // n = 6, score = 100 // 0fbe00 | movsx eax, byte ptr [eax] // 83f809 | cmp eax, 9 // 7416 | je 0x18 // 8b45fc | mov eax, dword ptr [ebp - 4] // 0fbe00 | movsx eax, byte ptr [eax] // 83f80d | cmp eax, 0xd $sequence_4 = { 59 80a012109a0000 68???????? e8???????? } // n = 4, score = 100 // 59 | pop ecx // 80a012109a0000 | and byte ptr [eax + 0x9a1012], 0 // 68???????? | // e8???????? | $sequence_5 = { 50 e8???????? 59 68???????? 8d85ecf6ffff 50 } // n = 6, score = 100 // 50 | push eax // e8???????? | // 59 | pop ecx // 68???????? | // 8d85ecf6ffff | lea eax, [ebp - 0x914] // 50 | push eax $sequence_6 = { 8bec b8400d0300 e8???????? 68360d0300 ff7508 } // n = 5, score = 100 // 8bec | mov ebp, esp // b8400d0300 | mov eax, 0x30d40 // e8???????? | // 68360d0300 | push 0x30d36 // ff7508 | push dword ptr [ebp + 8] $sequence_7 = { 59 59 68c4501010 68d83f1010 6814110010 e8???????? } // n = 6, score = 100 // 59 | pop ecx // 59 | pop ecx // 68c4501010 | push 0x101050c4 // 68d83f1010 | push 0x10103fd8 // 6814110010 | push 0x10001114 // e8???????? | $sequence_8 = { 0fbe00 83f82d 7409 8b45f8 40 8945f8 eb08 } // n = 7, score = 100 // 0fbe00 | movsx eax, byte ptr [eax] // 83f82d | cmp eax, 0x2d // 7409 | je 0xb // 8b45f8 | mov eax, dword ptr [ebp - 8] // 40 | inc eax // 8945f8 | mov dword ptr [ebp - 8], eax // eb08 | jmp 0xa $sequence_9 = { 8365fc00 6a40 ff7508 ff15???????? 59 59 } // n = 6, score = 100 // 8365fc00 | and dword ptr [ebp - 4], 0 // 6a40 | push 0x40 // ff7508 | push dword ptr [ebp + 8] // ff15???????? | // 59 | pop ecx // 59 | pop ecx condition: 7 of them and filesize < 2170880 }
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