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rule win_combos_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.combos." 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.combos" malpedia_rule_date = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { 47 83ff10 7c84 5f 5e } // n = 5, score = 100 // 47 | inc edi // 83ff10 | cmp edi, 0x10 // 7c84 | jl 0xffffff86 // 5f | pop edi // 5e | pop esi $sequence_1 = { 8504b548930010 0f95c0 88440c10 41 } // n = 4, score = 100 // 8504b548930010 | test dword ptr [esi*4 + 0x10009348], eax // 0f95c0 | setne al // 88440c10 | mov byte ptr [esp + ecx + 0x10], al // 41 | inc ecx $sequence_2 = { 894104 c3 53 55 8b6c2418 33c9 } // n = 6, score = 100 // 894104 | mov dword ptr [ecx + 4], eax // c3 | ret // 53 | push ebx // 55 | push ebp // 8b6c2418 | mov ebp, dword ptr [esp + 0x18] // 33c9 | xor ecx, ecx $sequence_3 = { c1f905 83e01f 8b0c8d201b0110 8d04c0 f644810401 7425 } // n = 6, score = 100 // c1f905 | sar ecx, 5 // 83e01f | and eax, 0x1f // 8b0c8d201b0110 | mov ecx, dword ptr [ecx*4 + 0x10011b20] // 8d04c0 | lea eax, [eax + eax*8] // f644810401 | test byte ptr [ecx + eax*4 + 4], 1 // 7425 | je 0x27 $sequence_4 = { 8b4c2410 7405 b908000000 3bc1 7d0e 8d0c2a 40 } // n = 7, score = 100 // 8b4c2410 | mov ecx, dword ptr [esp + 0x10] // 7405 | je 7 // b908000000 | mov ecx, 8 // 3bc1 | cmp eax, ecx // 7d0e | jge 0x10 // 8d0c2a | lea ecx, [edx + ebp] // 40 | inc eax $sequence_5 = { 3bca 7c03 8d71e4 8a543410 88540448 40 } // n = 6, score = 100 // 3bca | cmp ecx, edx // 7c03 | jl 5 // 8d71e4 | lea esi, [ecx - 0x1c] // 8a543410 | mov dl, byte ptr [esp + esi + 0x10] // 88540448 | mov byte ptr [esp + eax + 0x48], dl // 40 | inc eax $sequence_6 = { 772b ff248518210010 6a01 6a00 6a03 e8???????? } // n = 6, score = 100 // 772b | ja 0x2d // ff248518210010 | jmp dword ptr [eax*4 + 0x10002118] // 6a01 | push 1 // 6a00 | push 0 // 6a03 | push 3 // e8???????? | $sequence_7 = { 0fbe5428ff 8954240c 8d0cdd00000000 57 2bc1 } // n = 5, score = 100 // 0fbe5428ff | movsx edx, byte ptr [eax + ebp - 1] // 8954240c | mov dword ptr [esp + 0xc], edx // 8d0cdd00000000 | lea ecx, [ebx*8] // 57 | push edi // 2bc1 | sub eax, ecx $sequence_8 = { 51 57 68ffff1f00 8d45e4 50 ffd2 898594feffff } // n = 7, score = 100 // 51 | push ecx // 57 | push edi // 68ffff1f00 | push 0x1fffff // 8d45e4 | lea eax, [ebp - 0x1c] // 50 | push eax // ffd2 | call edx // 898594feffff | mov dword ptr [ebp - 0x16c], eax $sequence_9 = { 50 897c2428 e8???????? 83c414 } // n = 4, score = 100 // 50 | push eax // 897c2428 | mov dword ptr [esp + 0x28], edi // e8???????? | // 83c414 | add esp, 0x14 condition: 7 of them and filesize < 163840 }
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