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rule win_tellyouthepass_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.tellyouthepass." 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.tellyouthepass" malpedia_rule_date = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { 90 488b4a38 4883c107 48c1e903 48894c2478 31c0 4531d2 } // n = 7, score = 100 // 90 | dec eax // 488b4a38 | lea eax, [0x30e1d] // 4883c107 | dec eax // 48c1e903 | mov ecx, dword ptr [esp + 0x68] // 48894c2478 | dec eax // 31c0 | cmp ebx, ecx // 4531d2 | jne 0x16e $sequence_1 = { e8???????? 488b942490000000 807a4800 7414 488b542450 488b9c2490000000 4c8b6c2478 } // n = 7, score = 100 // e8???????? | // 488b942490000000 | dec eax // 807a4800 | mov dword ptr [eax + 0x28], ebx // 7414 | dec eax // 488b542450 | mov dword ptr [eax + 0x30], ecx // 488b9c2490000000 | dec eax // 4c8b6c2478 | mov dword ptr [eax + 0x38], edx $sequence_2 = { e8???????? 488b742440 4889ca 4889c1 4889df 0fbae208 7206 } // n = 7, score = 100 // e8???????? | // 488b742440 | dec eax // 4889ca | lea eax, [0x4b04f] // 4889c1 | dec eax // 4889df | mov ecx, dword ptr [esp + 0x120] // 0fbae208 | dec eax // 7206 | mov edx, dword ptr [esp + 0x88] $sequence_3 = { e8???????? 488d05dab90d00 488d1d63831400 e8???????? 488b7c2458 488d7701 488b542468 } // n = 7, score = 100 // e8???????? | // 488d05dab90d00 | dec eax // 488d1d63831400 | mov dword ptr [esp + 0x58], eax // e8???????? | // 488b7c2458 | dec eax // 488d7701 | mov ebx, dword ptr [esp + 0x80] // 488b542468 | dec eax $sequence_4 = { bb1a000000 e8???????? 488b442420 e8???????? 488d05a8761700 bb02000000 e8???????? } // n = 7, score = 100 // bb1a000000 | dec eax // e8???????? | // 488b442420 | mov ebp, dword ptr [esp + 0x28] // e8???????? | // 488d05a8761700 | dec eax // bb02000000 | add esp, 0x30 // e8???????? | $sequence_5 = { 4989d9 480f4fdf 90 4c39c6 7440 4889542430 4c894c2470 } // n = 7, score = 100 // 4989d9 | dec eax // 480f4fdf | mov dword ptr [esp + 0x50], ecx // 90 | dec eax // 4c39c6 | mov eax, edx // 7440 | dec eax // 4889542430 | lea ebx, [0x5cdd8] // 4c894c2470 | mov ecx, 0x264 $sequence_6 = { e8???????? 488b842400020000 e8???????? 488d052ca11900 bb07000000 6690 e8???????? } // n = 7, score = 100 // e8???????? | // 488b842400020000 | mov edx, dword ptr [ecx + 0x88] // e8???????? | // 488d052ca11900 | dec eax // bb07000000 | mov esi, dword ptr [ecx + 0x80] // 6690 | dec eax // e8???????? | $sequence_7 = { e8???????? e8???????? 488b442440 4885c0 751b e8???????? 488d05ac0d1b00 } // n = 7, score = 100 // e8???????? | // e8???????? | // 488b442440 | mov eax, dword ptr [esp + 0xb8] // 4885c0 | dec eax // 751b | lea eax, [0x1a5003] // e8???????? | // 488d05ac0d1b00 | dec eax $sequence_8 = { e8???????? 8b4358 4889442470 e8???????? 488d050c7b1900 bb13000000 e8???????? } // n = 7, score = 100 // e8???????? | // 8b4358 | dec eax // 4889442470 | lea esi, [esp + 0x78] // e8???????? | // 488d050c7b1900 | dec eax // bb13000000 | mov edx, dword ptr [esp + 0x200] // e8???????? | $sequence_9 = { 84db 741e 488b442460 8b5c2468 4c8b8c2490000000 4c8b542438 4989f0 } // n = 7, score = 100 // 84db | dec esp // 741e | lea eax, [0x777a3] // 488b442460 | inc ecx // 8b5c2468 | mov ecx, 3 // 4c8b8c2490000000 | dec eax // 4c8b542438 | mov eax, dword ptr [esp + 0x60] // 4989f0 | nop dword ptr [eax] condition: 7 of them and filesize < 7152640 }
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