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rule win_common_magic_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.common_magic." 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.common_magic" malpedia_rule_date = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { 85c9 747a 8b9578ffffff 51 e8???????? } // n = 5, score = 100 // 85c9 | test ecx, ecx // 747a | je 0x7c // 8b9578ffffff | mov edx, dword ptr [ebp - 0x88] // 51 | push ecx // e8???????? | $sequence_1 = { 85f6 7512 8d45c4 50 } // n = 4, score = 100 // 85f6 | test esi, esi // 7512 | jne 0x14 // 8d45c4 | lea eax, [ebp - 0x3c] // 50 | push eax $sequence_2 = { f30f7e8598fdffff 660fd64010 33c0 83470418 c78598fdffff00000000 898d9cfdffff } // n = 6, score = 100 // f30f7e8598fdffff | movq xmm0, qword ptr [ebp - 0x268] // 660fd64010 | movq qword ptr [eax + 0x10], xmm0 // 33c0 | xor eax, eax // 83470418 | add dword ptr [edi + 4], 0x18 // c78598fdffff00000000 | mov dword ptr [ebp - 0x268], 0 // 898d9cfdffff | mov dword ptr [ebp - 0x264], ecx $sequence_3 = { 8b45e8 c645d300 83f808 722b } // n = 4, score = 100 // 8b45e8 | mov eax, dword ptr [ebp - 0x18] // c645d300 | mov byte ptr [ebp - 0x2d], 0 // 83f808 | cmp eax, 8 // 722b | jb 0x2d $sequence_4 = { 90 85f6 740b 83feff 0f8483000000 eb7d 8b1c9d901a4100 } // n = 7, score = 100 // 90 | nop // 85f6 | test esi, esi // 740b | je 0xd // 83feff | cmp esi, -1 // 0f8483000000 | je 0x89 // eb7d | jmp 0x7f // 8b1c9d901a4100 | mov ebx, dword ptr [ebx*4 + 0x411a90] $sequence_5 = { 0f87ab020000 51 56 e8???????? 83c408 c7458000000000 } // n = 6, score = 100 // 0f87ab020000 | ja 0x2b1 // 51 | push ecx // 56 | push esi // e8???????? | // 83c408 | add esp, 8 // c7458000000000 | mov dword ptr [ebp - 0x80], 0 $sequence_6 = { 81f9aaaaaa0a 0f8737010000 8d1c49 c1e303 } // n = 4, score = 100 // 81f9aaaaaa0a | cmp ecx, 0xaaaaaaa // 0f8737010000 | ja 0x13d // 8d1c49 | lea ebx, [ecx + ecx*2] // c1e303 | shl ebx, 3 $sequence_7 = { c745d052004100 c745d44d004400 c745d841005400 894ddc } // n = 4, score = 100 // c745d052004100 | mov dword ptr [ebp - 0x30], 0x410052 // c745d44d004400 | mov dword ptr [ebp - 0x2c], 0x44004d // c745d841005400 | mov dword ptr [ebp - 0x28], 0x540041 // 894ddc | mov dword ptr [ebp - 0x24], ecx $sequence_8 = { 85c0 0f848f000000 8b5508 8d7023 83e6e0 } // n = 5, score = 100 // 85c0 | test eax, eax // 0f848f000000 | je 0x95 // 8b5508 | mov edx, dword ptr [ebp + 8] // 8d7023 | lea esi, [eax + 0x23] // 83e6e0 | and esi, 0xffffffe0 $sequence_9 = { 8bb5a8fdffff eb20 8d8de8fdffff c685a4fdffff00 51 ffb5a4fdffff 8d8dacfdffff } // n = 7, score = 100 // 8bb5a8fdffff | mov esi, dword ptr [ebp - 0x258] // eb20 | jmp 0x22 // 8d8de8fdffff | lea ecx, [ebp - 0x218] // c685a4fdffff00 | mov byte ptr [ebp - 0x25c], 0 // 51 | push ecx // ffb5a4fdffff | push dword ptr [ebp - 0x25c] // 8d8dacfdffff | lea ecx, [ebp - 0x254] condition: 7 of them and filesize < 212992 }
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