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rule win_unidentified_108_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.unidentified_108." 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.unidentified_108" 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 = { 488d05c7580100 4a8b0ce8 42385cf938 7d4f 400fbece 4084f6 } // n = 6, score = 100 // 488d05c7580100 | test eax, eax // 4a8b0ce8 | je 0x669 // 42385cf938 | dec esp // 7d4f | lea eax, [0xea8e] // 400fbece | dec eax // 4084f6 | mov edi, ecx $sequence_1 = { 0f8493010000 488d2d3a100100 83635000 83632c00 e9???????? 48ff4318 837b2800 } // n = 7, score = 100 // 0f8493010000 | dec ecx // 488d2d3a100100 | sar eax, 6 // 83635000 | inc esp // 83632c00 | lea ebx, [ecx - 1] // e9???????? | // 48ff4318 | dec eax // 837b2800 | mov dword ptr [ebp - 0x39], eax $sequence_2 = { 660feb0d???????? 4c8d0d44950000 f20f5cca f2410f590cc1 660f28d1 660f28c1 4c8d0d0b850000 } // n = 7, score = 100 // 660feb0d???????? | // 4c8d0d44950000 | lea eax, [0xf2ec] // f20f5cca | dec edx // f2410f590cc1 | mov eax, dword ptr [eax + ecx*8] // 660f28d1 | inc edx // 660f28c1 | test byte ptr [eax + edx*8 + 0x38], 0x48 // 4c8d0d0b850000 | je 0xf00 $sequence_3 = { 7426 488d5540 803201 488d5201 41ffc0 488d4540 498bcc } // n = 7, score = 100 // 7426 | and eax, 0x3f // 488d5540 | dec ecx // 803201 | sar ecx, 6 // 488d5201 | dec esp // 41ffc0 | lea edx, [eax + eax*8] // 488d4540 | dec eax // 498bcc | lea eax, [0xf2ec] $sequence_4 = { 4c8d05a8310100 83e23f 488d14d2 498b04c0 f644d03801 } // n = 5, score = 100 // 4c8d05a8310100 | lea edx, [0xf449] // 83e23f | inc esp // 488d14d2 | mov byte ptr [ebx], al // 498b04c0 | dec eax // f644d03801 | inc ebx $sequence_5 = { 488d1dd6db0100 458bc5 498bcc 48ffc1 4438040b 75f7 4885c9 } // n = 7, score = 100 // 488d1dd6db0100 | mov eax, esp // 458bc5 | movsd qword ptr [ebp + 0x20], xmm0 // 498bcc | dec eax // 48ffc1 | lea ecx, [ebp + 0x20] // 4438040b | inc ebp // 75f7 | mov eax, ebp // 4885c9 | dec eax $sequence_6 = { 458bc5 498bc4 90 48ffc0 44380401 } // n = 5, score = 100 // 458bc5 | mov word ptr [esp + 0x88], ax // 498bc4 | mov word ptr [ebx], cx // 90 | inc ebp // 48ffc0 | xor eax, eax // 44380401 | dec eax $sequence_7 = { 0fb6557f 4889451f 83f201 488d05dbc90000 49c1e302 4889452f 03d2 } // n = 7, score = 100 // 0fb6557f | test ebp, ebp // 4889451f | js 0x956 // 83f201 | inc ecx // 488d05dbc90000 | mul ebp // 49c1e302 | mov eax, edx // 4889452f | dec eax // 03d2 | lea edx, [0xffff18da] $sequence_8 = { 488d9588000000 803201 488d5201 41ffc0 488d8588000000 } // n = 5, score = 100 // 488d9588000000 | je 0x1c5 // 803201 | je 0x4aa // 488d5201 | inc ebp // 41ffc0 | xor ecx, ecx // 488d8588000000 | inc esp $sequence_9 = { 7350 488bca 4c8d051d310100 83e13f 488bc2 48c1f806 } // n = 6, score = 100 // 7350 | dec eax // 488bca | lea edi, [0x16e2d] // 4c8d051d310100 | jmp 0x309 // 83e13f | dec eax // 488bc2 | cmp ebx, eax // 48c1f806 | jne 0x372 condition: 7 of them and filesize < 307200 }
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