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rule win_webc2_kt3_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.webc2_kt3." 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.webc2_kt3" 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 = { 8b8d0cfcffff 894de8 90 f8 } // n = 4, score = 100 // 8b8d0cfcffff | mov ecx, dword ptr [ebp - 0x3f4] // 894de8 | mov dword ptr [ebp - 0x18], ecx // 90 | nop // f8 | clc $sequence_1 = { 0f8502000000 ebe9 8b45dc 8b480c 51 } // n = 5, score = 100 // 0f8502000000 | jne 8 // ebe9 | jmp 0xffffffeb // 8b45dc | mov eax, dword ptr [ebp - 0x24] // 8b480c | mov ecx, dword ptr [eax + 0xc] // 51 | push ecx $sequence_2 = { 8d8decfeffff 51 e8???????? 83c40c 0f8408000000 } // n = 5, score = 100 // 8d8decfeffff | lea ecx, [ebp - 0x114] // 51 | push ecx // e8???????? | // 83c40c | add esp, 0xc // 0f8408000000 | je 0xe $sequence_3 = { f7d8 83da00 5b c21000 833d????????00 7505 } // n = 6, score = 100 // f7d8 | neg eax // 83da00 | sbb edx, 0 // 5b | pop ebx // c21000 | ret 0x10 // 833d????????00 | // 7505 | jne 7 $sequence_4 = { e9???????? 8b45dc 8b4810 894df4 } // n = 4, score = 100 // e9???????? | // 8b45dc | mov eax, dword ptr [ebp - 0x24] // 8b4810 | mov ecx, dword ptr [eax + 0x10] // 894df4 | mov dword ptr [ebp - 0xc], ecx $sequence_5 = { 66c745c80000 c745cc00000000 66c745ca0000 c745c401010000 8b4508 } // n = 5, score = 100 // 66c745c80000 | mov word ptr [ebp - 0x38], 0 // c745cc00000000 | mov dword ptr [ebp - 0x34], 0 // 66c745ca0000 | mov word ptr [ebp - 0x36], 0 // c745c401010000 | mov dword ptr [ebp - 0x3c], 0x101 // 8b4508 | mov eax, dword ptr [ebp + 8] $sequence_6 = { e9???????? 8b4de8 0fbe11 83fa7a 750e 8b4508 } // n = 6, score = 100 // e9???????? | // 8b4de8 | mov ecx, dword ptr [ebp - 0x18] // 0fbe11 | movsx edx, byte ptr [ecx] // 83fa7a | cmp edx, 0x7a // 750e | jne 0x10 // 8b4508 | mov eax, dword ptr [ebp + 8] $sequence_7 = { 83c40c 0f8408000000 0f8502000000 ebe9 8dbdecfeffff } // n = 5, score = 100 // 83c40c | add esp, 0xc // 0f8408000000 | je 0xe // 0f8502000000 | jne 8 // ebe9 | jmp 0xffffffeb // 8dbdecfeffff | lea edi, [ebp - 0x114] $sequence_8 = { 51 ff15???????? 8b55e8 0fbe02 } // n = 4, score = 100 // 51 | push ecx // ff15???????? | // 8b55e8 | mov edx, dword ptr [ebp - 0x18] // 0fbe02 | movsx eax, byte ptr [edx] $sequence_9 = { 8b5104 52 ff15???????? 85c0 7502 eb05 e9???????? } // n = 7, score = 100 // 8b5104 | mov edx, dword ptr [ecx + 4] // 52 | push edx // ff15???????? | // 85c0 | test eax, eax // 7502 | jne 4 // eb05 | jmp 7 // e9???????? | condition: 7 of them and filesize < 114688 }
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