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rule win_combos_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2024-10-31" 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 = "20241030" malpedia_hash = "26e26953c49c8efafbf72a38076855d578e0a2e4" malpedia_version = "20241030" 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 = { 8bd8 899dd8feffff 3bdf 0f84a2000000 8b7d0c 83c9ff } // n = 6, score = 100 // 8bd8 | mov ebx, eax // 899dd8feffff | mov dword ptr [ebp - 0x128], ebx // 3bdf | cmp ebx, edi // 0f84a2000000 | je 0xa8 // 8b7d0c | mov edi, dword ptr [ebp + 0xc] // 83c9ff | or ecx, 0xffffffff $sequence_1 = { 83e33f 33d3 c1f804 8b9c9600030000 8a51ff 0bfb } // n = 6, score = 100 // 83e33f | and ebx, 0x3f // 33d3 | xor edx, ebx // c1f804 | sar eax, 4 // 8b9c9600030000 | mov ebx, dword ptr [esi + edx*4 + 0x300] // 8a51ff | mov dl, byte ptr [ecx - 1] // 0bfb | or edi, ebx $sequence_2 = { c1f805 8d1c85201b0110 8b4508 83e01f 8d34c0 } // n = 5, score = 100 // c1f805 | sar eax, 5 // 8d1c85201b0110 | lea ebx, [eax*4 + 0x10011b20] // 8b4508 | mov eax, dword ptr [ebp + 8] // 83e01f | and eax, 0x1f // 8d34c0 | lea esi, [eax + eax*8] $sequence_3 = { 53 56 8b8dd8feffff 51 57 68ffff1f00 } // n = 6, score = 100 // 53 | push ebx // 56 | push esi // 8b8dd8feffff | mov ecx, dword ptr [ebp - 0x128] // 51 | push ecx // 57 | push edi // 68ffff1f00 | push 0x1fffff $sequence_4 = { 85db 750b 8d4eff 3bf9 8b4c2410 } // n = 5, score = 100 // 85db | test ebx, ebx // 750b | jne 0xd // 8d4eff | lea ecx, [esi - 1] // 3bf9 | cmp edi, ecx // 8b4c2410 | mov ecx, dword ptr [esp + 0x10] $sequence_5 = { ff15???????? 8bd0 8995d8feffff 3bd3 0f847d010000 } // n = 5, score = 100 // ff15???????? | // 8bd0 | mov edx, eax // 8995d8feffff | mov dword ptr [ebp - 0x128], edx // 3bd3 | cmp edx, ebx // 0f847d010000 | je 0x183 $sequence_6 = { 48 8bf0 c1f803 83e607 0fbe0410 8504b548930010 0f95c0 } // n = 7, score = 100 // 48 | dec eax // 8bf0 | mov esi, eax // c1f803 | sar eax, 3 // 83e607 | and esi, 7 // 0fbe0410 | movsx eax, byte ptr [eax + edx] // 8504b548930010 | test dword ptr [esi*4 + 0x10009348], eax // 0f95c0 | setne al $sequence_7 = { 8b0c8d201b0110 8d04c0 f644810401 7425 57 56 e8???????? } // n = 7, score = 100 // 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 // 57 | push edi // 56 | push esi // e8???????? | $sequence_8 = { 50 56 e8???????? 8945d0 8b7d08 } // n = 5, score = 100 // 50 | push eax // 56 | push esi // e8???????? | // 8945d0 | mov dword ptr [ebp - 0x30], eax // 8b7d08 | mov edi, dword ptr [ebp + 8] $sequence_9 = { 8bd0 2be8 89542414 eb04 8b542414 33c0 } // n = 6, score = 100 // 8bd0 | mov edx, eax // 2be8 | sub ebp, eax // 89542414 | mov dword ptr [esp + 0x14], edx // eb04 | jmp 6 // 8b542414 | mov edx, dword ptr [esp + 0x14] // 33c0 | xor eax, eax condition: 7 of them and filesize < 163840 }
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