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rule win_rorschach_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.rorschach." 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.rorschach" 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 = { e8???????? 8885df000000 33d2 488d8da0000000 e8???????? 8885e0000000 b26d } // n = 7, score = 100 // e8???????? | // 8885df000000 | inc eax // 33d2 | nop // 488d8da0000000 | dec esp // e8???????? | // 8885e0000000 | mov dword ptr [eax], ecx // b26d | dec esp $sequence_1 = { 488bf0 400fb6d7 488d4dc8 e8???????? 8806 49ffc6 4983fe0e } // n = 7, score = 100 // 488bf0 | lea ecx, [edx + 0x1640] // 400fb6d7 | dec eax // 488d4dc8 | lea ecx, [edx + 0x1680] // e8???????? | // 8806 | dec eax // 49ffc6 | lea ecx, [edx + 0x1640] // 4983fe0e | dec eax $sequence_2 = { e9???????? 0fb75106 8915???????? 0fb77914 4803f9 488b0d???????? 4885c9 } // n = 7, score = 100 // e9???????? | // 0fb75106 | dec ebp // 8915???????? | // 0fb77914 | lea esp, [esi + 0x448] // 4803f9 | dec eax // 488b0d???????? | // 4885c9 | lea edx, [ebp + 0x389] $sequence_3 = { e8???????? 8885d1070000 33d2 488d8dd0060000 e8???????? 8885d2070000 b222 } // n = 7, score = 100 // e8???????? | // 8885d1070000 | lea ecx, [ebp + 0x14e1] // 33d2 | dec eax // 488d8dd0060000 | mov esi, eax // e8???????? | // 8885d2070000 | mov word ptr [ebp + 0xb25], ax // b222 | dec esp $sequence_4 = { 0fb64db0 ebed 66c745bd0000 488b8da8000000 4903cf 488d55b1 e8???????? } // n = 7, score = 100 // 0fb64db0 | mov dl, 0x67 // ebed | mov byte ptr [ebp + 0xe77], al // 66c745bd0000 | xor edx, edx // 488b8da8000000 | dec eax // 4903cf | lea ecx, [ebp + 0xb30] // 488d55b1 | mov byte ptr [ebp + 0xe78], al // e8???????? | $sequence_5 = { e8???????? 8885fa020000 b26e 488d8dd0020000 e8???????? 8885fb020000 33d2 } // n = 7, score = 100 // e8???????? | // 8885fa020000 | mov edx, dword ptr [eax] // b26e | dec ecx // 488d8dd0020000 | mov ecx, dword ptr [eax + 0x10] // e8???????? | // 8885fb020000 | dec eax // 33d2 | test ecx, ecx $sequence_6 = { e8???????? 8885c00b0000 b265 488d8d300b0000 e8???????? 8885c10b0000 33d2 } // n = 7, score = 100 // e8???????? | // 8885c00b0000 | nop dword ptr [eax] // b265 | nop dword ptr [eax + eax] // 488d8d300b0000 | dec ecx // e8???????? | // 8885c10b0000 | mov edx, edi // 33d2 | dec eax $sequence_7 = { eb0f 488bd3 488d0dff6c0300 e8???????? 33c9 85c0 480f44cb } // n = 7, score = 100 // eb0f | mov dword ptr [ebp + 0x1a0], edi // 488bd3 | dec eax // 488d0dff6c0300 | mov dword ptr [ebp + 0x1a8], 7 // e8???????? | // 33c9 | inc sp // 85c0 | mov dword ptr [ebp + 0x190], edi // 480f44cb | dec eax $sequence_8 = { 4983ff12 72c1 ba12000000 488d8d91000000 e8???????? c60000 ba13000000 } // n = 7, score = 100 // 4983ff12 | dec eax // 72c1 | lea ecx, [ebp + 0x8e0] // ba12000000 | xor edx, edx // 488d8d91000000 | dec eax // e8???????? | // c60000 | lea ecx, [ebp + 0x8e0] // ba13000000 | mov byte ptr [ebp + 0xae8], al $sequence_9 = { e8???????? 8885ee090000 b273 488d8de0080000 e8???????? 8885ef090000 33d2 } // n = 7, score = 100 // e8???????? | // 8885ee090000 | shr ax, cl // b273 | xor edx, edx // 488d8de0080000 | cmp bl, ch // e8???????? | // 8885ef090000 | stc // 33d2 | dec al condition: 7 of them and filesize < 3921930 }
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