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rule win_findpos_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.findpos." 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.findpos" 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 = { 8bc8 890d???????? 85c9 743b 8b45f8 a3???????? } // n = 6, score = 100 // 8bc8 | mov ecx, eax // 890d???????? | // 85c9 | test ecx, ecx // 743b | je 0x3d // 8b45f8 | mov eax, dword ptr [ebp - 8] // a3???????? | $sequence_1 = { eb02 8bcb e8???????? 33f6 46 53 85c0 } // n = 7, score = 100 // eb02 | jmp 4 // 8bcb | mov ecx, ebx // e8???????? | // 33f6 | xor esi, esi // 46 | inc esi // 53 | push ebx // 85c0 | test eax, eax $sequence_2 = { 51 50 ff75e4 8d45e8 50 e8???????? 8b00 } // n = 7, score = 100 // 51 | push ecx // 50 | push eax // ff75e4 | push dword ptr [ebp - 0x1c] // 8d45e8 | lea eax, [ebp - 0x18] // 50 | push eax // e8???????? | // 8b00 | mov eax, dword ptr [eax] $sequence_3 = { 7405 e8???????? dbe2 5d c3 b8???????? c705????????499b4000 } // n = 7, score = 100 // 7405 | je 7 // e8???????? | // dbe2 | fnclex // 5d | pop ebp // c3 | ret // b8???????? | // c705????????499b4000 | $sequence_4 = { ff15???????? 85c0 7477 8d45ec } // n = 4, score = 100 // ff15???????? | // 85c0 | test eax, eax // 7477 | je 0x79 // 8d45ec | lea eax, [ebp - 0x14] $sequence_5 = { 8b750c 8d4de8 8975e8 e8???????? 8b00 3b05???????? 7416 } // n = 7, score = 100 // 8b750c | mov esi, dword ptr [ebp + 0xc] // 8d4de8 | lea ecx, [ebp - 0x18] // 8975e8 | mov dword ptr [ebp - 0x18], esi // e8???????? | // 8b00 | mov eax, dword ptr [eax] // 3b05???????? | // 7416 | je 0x18 $sequence_6 = { 7411 8b45e8 53 8b4808 51 80790d00 7495 } // n = 7, score = 100 // 7411 | je 0x13 // 8b45e8 | mov eax, dword ptr [ebp - 0x18] // 53 | push ebx // 8b4808 | mov ecx, dword ptr [eax + 8] // 51 | push ecx // 80790d00 | cmp byte ptr [ecx + 0xd], 0 // 7495 | je 0xffffff97 $sequence_7 = { 0f43ca c6041900 5b 5f b8???????? 5e 5d } // n = 7, score = 100 // 0f43ca | cmovae ecx, edx // c6041900 | mov byte ptr [ecx + ebx], 0 // 5b | pop ebx // 5f | pop edi // b8???????? | // 5e | pop esi // 5d | pop ebp $sequence_8 = { 8bf0 83feff 7479 8b85f0efffff 89bdf8efffff 8bdf 89bdf4efffff } // n = 7, score = 100 // 8bf0 | mov esi, eax // 83feff | cmp esi, -1 // 7479 | je 0x7b // 8b85f0efffff | mov eax, dword ptr [ebp - 0x1010] // 89bdf8efffff | mov dword ptr [ebp - 0x1008], edi // 8bdf | mov ebx, edi // 89bdf4efffff | mov dword ptr [ebp - 0x100c], edi $sequence_9 = { 8b4014 894df0 8945fc 85c9 742f 0fbf047a } // n = 6, score = 100 // 8b4014 | mov eax, dword ptr [eax + 0x14] // 894df0 | mov dword ptr [ebp - 0x10], ecx // 8945fc | mov dword ptr [ebp - 4], eax // 85c9 | test ecx, ecx // 742f | je 0x31 // 0fbf047a | movsx eax, word ptr [edx + edi*2] condition: 7 of them and filesize < 286720 }
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