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rule win_findpos_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" 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 = "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 = { 48 0f844b050000 33c0 8d8c24f0010000 50 51 8d8c243c020000 } // n = 7, score = 100 // 48 | dec eax // 0f844b050000 | je 0x551 // 33c0 | xor eax, eax // 8d8c24f0010000 | lea ecx, [esp + 0x1f0] // 50 | push eax // 51 | push ecx // 8d8c243c020000 | lea ecx, [esp + 0x23c] $sequence_1 = { 68???????? e8???????? a1???????? 59 59 83c010 a3???????? } // n = 7, score = 100 // 68???????? | // e8???????? | // a1???????? | // 59 | pop ecx // 59 | pop ecx // 83c010 | add eax, 0x10 // a3???????? | $sequence_2 = { 7671 8365d400 8d55d4 8bcf } // n = 4, score = 100 // 7671 | jbe 0x73 // 8365d400 | and dword ptr [ebp - 0x2c], 0 // 8d55d4 | lea edx, [ebp - 0x2c] // 8bcf | mov ecx, edi $sequence_3 = { 8bcf e8???????? 8325????????00 833d????????10 68???????? 0f4335???????? } // n = 6, score = 100 // 8bcf | mov ecx, edi // e8???????? | // 8325????????00 | // 833d????????10 | // 68???????? | // 0f4335???????? | $sequence_4 = { 8b0cb8 03cb e8???????? 85c0 7414 8b4df0 } // n = 6, score = 100 // 8b0cb8 | mov ecx, dword ptr [eax + edi*4] // 03cb | add ecx, ebx // e8???????? | // 85c0 | test eax, eax // 7414 | je 0x16 // 8b4df0 | mov ecx, dword ptr [ebp - 0x10] $sequence_5 = { eb29 8a01 3c33 7505 } // n = 4, score = 100 // eb29 | jmp 0x2b // 8a01 | mov al, byte ptr [ecx] // 3c33 | cmp al, 0x33 // 7505 | jne 7 $sequence_6 = { 8945f8 8d45f8 50 c745ec00200000 ff15???????? 85c0 745f } // n = 7, score = 100 // 8945f8 | mov dword ptr [ebp - 8], eax // 8d45f8 | lea eax, [ebp - 8] // 50 | push eax // c745ec00200000 | mov dword ptr [ebp - 0x14], 0x2000 // ff15???????? | // 85c0 | test eax, eax // 745f | je 0x61 $sequence_7 = { 3b08 7518 53 51 51 6a01 8d45e4 } // n = 7, score = 100 // 3b08 | cmp ecx, dword ptr [eax] // 7518 | jne 0x1a // 53 | push ebx // 51 | push ecx // 51 | push ecx // 6a01 | push 1 // 8d45e4 | lea eax, [ebp - 0x1c] $sequence_8 = { 50 0fb6c1 50 8d85e8e7ffff 50 } // n = 5, score = 100 // 50 | push eax // 0fb6c1 | movzx eax, cl // 50 | push eax // 8d85e8e7ffff | lea eax, [ebp - 0x1818] // 50 | push eax $sequence_9 = { 33f6 46 3bc6 0f8577040000 6a11 ffd7 663bc6 } // n = 7, score = 100 // 33f6 | xor esi, esi // 46 | inc esi // 3bc6 | cmp eax, esi // 0f8577040000 | jne 0x47d // 6a11 | push 0x11 // ffd7 | call edi // 663bc6 | cmp ax, si condition: 7 of them and filesize < 286720 }
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