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rule win_stresspaint_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.stresspaint." 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.stresspaint" 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 = { 0103 014510 294514 83665800 } // n = 4, score = 100 // 0103 | add dword ptr [ebx], eax // 014510 | add dword ptr [ebp + 0x10], eax // 294514 | sub dword ptr [ebp + 0x14], eax // 83665800 | and dword ptr [esi + 0x58], 0 $sequence_1 = { 8d540208 8908 8d4a04 8a5202 51 } // n = 5, score = 100 // 8d540208 | lea edx, [edx + eax + 8] // 8908 | mov dword ptr [eax], ecx // 8d4a04 | lea ecx, [edx + 4] // 8a5202 | mov dl, byte ptr [edx + 2] // 51 | push ecx $sequence_2 = { 8d540203 3bea 7e4d 8b6c241c } // n = 4, score = 100 // 8d540203 | lea edx, [edx + eax + 3] // 3bea | cmp ebp, edx // 7e4d | jle 0x4f // 8b6c241c | mov ebp, dword ptr [esp + 0x1c] $sequence_3 = { 0106 83560400 837d1c00 7494 } // n = 4, score = 100 // 0106 | add dword ptr [esi], eax // 83560400 | adc dword ptr [esi + 4], 0 // 837d1c00 | cmp dword ptr [ebp + 0x1c], 0 // 7494 | je 0xffffff96 $sequence_4 = { 0103 ebaa 8b442408 56 } // n = 4, score = 100 // 0103 | add dword ptr [ebx], eax // ebaa | jmp 0xffffffac // 8b442408 | mov eax, dword ptr [esp + 8] // 56 | push esi $sequence_5 = { 0103 014510 294674 8b4674 } // n = 4, score = 100 // 0103 | add dword ptr [ebx], eax // 014510 | add dword ptr [ebp + 0x10], eax // 294674 | sub dword ptr [esi + 0x74], eax // 8b4674 | mov eax, dword ptr [esi + 0x74] $sequence_6 = { 0107 115f04 3bcb 7508 } // n = 4, score = 100 // 0107 | add dword ptr [edi], eax // 115f04 | adc dword ptr [edi + 4], ebx // 3bcb | cmp ecx, ebx // 7508 | jne 0xa $sequence_7 = { 0108 8b8e44010000 114804 8b4f18 } // n = 4, score = 100 // 0108 | add dword ptr [eax], ecx // 8b8e44010000 | mov ecx, dword ptr [esi + 0x144] // 114804 | adc dword ptr [eax + 4], ecx // 8b4f18 | mov ecx, dword ptr [edi + 0x18] $sequence_8 = { 0107 83570400 85c9 7508 } // n = 4, score = 100 // 0107 | add dword ptr [edi], eax // 83570400 | adc dword ptr [edi + 4], 0 // 85c9 | test ecx, ecx // 7508 | jne 0xa $sequence_9 = { 010b 8945fc 8bc2 83530400 } // n = 4, score = 100 // 010b | add dword ptr [ebx], ecx // 8945fc | mov dword ptr [ebp - 4], eax // 8bc2 | mov eax, edx // 83530400 | adc dword ptr [ebx + 4], 0 $sequence_10 = { 8d5318 c7432400200000 66897312 c6431100 890a } // n = 5, score = 100 // 8d5318 | lea edx, [ebx + 0x18] // c7432400200000 | mov dword ptr [ebx + 0x24], 0x2000 // 66897312 | mov word ptr [ebx + 0x12], si // c6431100 | mov byte ptr [ebx + 0x11], 0 // 890a | mov dword ptr [edx], ecx $sequence_11 = { 8d540201 52 51 6a39 55 } // n = 5, score = 100 // 8d540201 | lea edx, [edx + eax + 1] // 52 | push edx // 51 | push ecx // 6a39 | push 0x39 // 55 | push ebp $sequence_12 = { 8d540101 8bc5 89542430 8b542450 } // n = 4, score = 100 // 8d540101 | lea edx, [ecx + eax + 1] // 8bc5 | mov eax, ebp // 89542430 | mov dword ptr [esp + 0x30], edx // 8b542450 | mov edx, dword ptr [esp + 0x50] $sequence_13 = { 8d5338 3b02 740a 41 83c250 3bcf } // n = 6, score = 100 // 8d5338 | lea edx, [ebx + 0x38] // 3b02 | cmp eax, dword ptr [edx] // 740a | je 0xc // 41 | inc ecx // 83c250 | add edx, 0x50 // 3bcf | cmp ecx, edi $sequence_14 = { 8d540201 8915???????? 33c0 8bd6 } // n = 4, score = 100 // 8d540201 | lea edx, [edx + eax + 1] // 8915???????? | // 33c0 | xor eax, eax // 8bd6 | mov edx, esi $sequence_15 = { 8d540208 8b4500 c70100000000 8b4c2430 } // n = 4, score = 100 // 8d540208 | lea edx, [edx + eax + 8] // 8b4500 | mov eax, dword ptr [ebp] // c70100000000 | mov dword ptr [ecx], 0 // 8b4c2430 | mov ecx, dword ptr [esp + 0x30] condition: 7 of them and filesize < 1155072 }
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