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rule win_rawpos_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2026-01-05" version = "1" description = "Detects win.rawpos." 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.rawpos" malpedia_rule_date = "20260105" malpedia_hash = "19b79e7cab4eaf532122e5b45a77dd8f6bb5cc79" malpedia_version = "20251219" 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 = { 59 85c0 757b 0fbe4604 50 e8???????? 59 } // n = 7, score = 100 // 59 | pop ecx // 85c0 | test eax, eax // 757b | jne 0x7d // 0fbe4604 | movsx eax, byte ptr [esi + 4] // 50 | push eax // e8???????? | // 59 | pop ecx $sequence_1 = { 8bf8 33c0 8a07 83f845 7c05 b845000000 83f83b } // n = 7, score = 100 // 8bf8 | mov edi, eax // 33c0 | xor eax, eax // 8a07 | mov al, byte ptr [edi] // 83f845 | cmp eax, 0x45 // 7c05 | jl 7 // b845000000 | mov eax, 0x45 // 83f83b | cmp eax, 0x3b $sequence_2 = { 5d c3 55 8bec 83c4dc 33c0 33d2 } // n = 7, score = 100 // 5d | pop ebp // c3 | ret // 55 | push ebp // 8bec | mov ebp, esp // 83c4dc | add esp, -0x24 // 33c0 | xor eax, eax // 33d2 | xor edx, edx $sequence_3 = { e8???????? 83c408 85c0 0f842e070000 8b4520 8d4df4 50 } // n = 7, score = 100 // e8???????? | // 83c408 | add esp, 8 // 85c0 | test eax, eax // 0f842e070000 | je 0x734 // 8b4520 | mov eax, dword ptr [ebp + 0x20] // 8d4df4 | lea ecx, [ebp - 0xc] // 50 | push eax $sequence_4 = { 8bc3 f7d8 83f803 750a bb08000000 e9???????? } // n = 6, score = 100 // 8bc3 | mov eax, ebx // f7d8 | neg eax // 83f803 | cmp eax, 3 // 750a | jne 0xc // bb08000000 | mov ebx, 8 // e9???????? | $sequence_5 = { 837df400 7507 8bf7 e9???????? 803f10 7526 } // n = 6, score = 100 // 837df400 | cmp dword ptr [ebp - 0xc], 0 // 7507 | jne 9 // 8bf7 | mov esi, edi // e9???????? | // 803f10 | cmp byte ptr [edi], 0x10 // 7526 | jne 0x28 $sequence_6 = { c646ff10 c60601 46 8a45d0 8806 46 } // n = 6, score = 100 // c646ff10 | mov byte ptr [esi - 1], 0x10 // c60601 | mov byte ptr [esi], 1 // 46 | inc esi // 8a45d0 | mov al, byte ptr [ebp - 0x30] // 8806 | mov byte ptr [esi], al // 46 | inc esi $sequence_7 = { 8a13 80c2d3 80ea02 720f 80c2fe 80ea02 7207 } // n = 7, score = 100 // 8a13 | mov dl, byte ptr [ebx] // 80c2d3 | add dl, 0xd3 // 80ea02 | sub dl, 2 // 720f | jb 0x11 // 80c2fe | add dl, 0xfe // 80ea02 | sub dl, 2 // 7207 | jb 9 $sequence_8 = { 53 8b4510 83c6ff 50 57 52 e8???????? } // n = 7, score = 100 // 53 | push ebx // 8b4510 | mov eax, dword ptr [ebp + 0x10] // 83c6ff | add esi, -1 // 50 | push eax // 57 | push edi // 52 | push edx // e8???????? | $sequence_9 = { eb03 83c8ff 5f 5e 5b 59 5d } // n = 7, score = 100 // eb03 | jmp 5 // 83c8ff | or eax, 0xffffffff // 5f | pop edi // 5e | pop esi // 5b | pop ebx // 59 | pop ecx // 5d | pop ebp condition: 7 of them and filesize < 466944 }
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