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rule win_webc2_kt3_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" 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 = "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 = { 8a92c0c84000 089021d34000 40 3bc7 76f5 41 } // n = 6, score = 100 // 8a92c0c84000 | mov dl, byte ptr [edx + 0x40c8c0] // 089021d34000 | or byte ptr [eax + 0x40d321], dl // 40 | inc eax // 3bc7 | cmp eax, edi // 76f5 | jbe 0xfffffff7 // 41 | inc ecx $sequence_1 = { ff15???????? 85c0 0f843a010000 83bdf0fbffff00 0f86a4000000 } // n = 5, score = 100 // ff15???????? | // 85c0 | test eax, eax // 0f843a010000 | je 0x140 // 83bdf0fbffff00 | cmp dword ptr [ebp - 0x410], 0 // 0f86a4000000 | jbe 0xaa $sequence_2 = { 836dd001 837dd000 742c 836dd001 } // n = 4, score = 100 // 836dd001 | sub dword ptr [ebp - 0x30], 1 // 837dd000 | cmp dword ptr [ebp - 0x30], 0 // 742c | je 0x2e // 836dd001 | sub dword ptr [ebp - 0x30], 1 $sequence_3 = { 0345f8 c60000 8b4de8 51 ff15???????? 8b55e8 0fbe02 } // n = 7, score = 100 // 0345f8 | add eax, dword ptr [ebp - 8] // c60000 | mov byte ptr [eax], 0 // 8b4de8 | mov ecx, dword ptr [ebp - 0x18] // 51 | push ecx // ff15???????? | // 8b55e8 | mov edx, dword ptr [ebp - 0x18] // 0fbe02 | movsx eax, byte ptr [edx] $sequence_4 = { 8955a8 66c745c80000 c745cc00000000 66c745ca0000 c745c401010000 8b4508 8945d0 } // n = 7, score = 100 // 8955a8 | mov dword ptr [ebp - 0x58], edx // 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] // 8945d0 | mov dword ptr [ebp - 0x30], eax $sequence_5 = { e8???????? 8945fc 837dfc00 7d05 83c8ff eb25 837dfc00 } // n = 7, score = 100 // e8???????? | // 8945fc | mov dword ptr [ebp - 4], eax // 837dfc00 | cmp dword ptr [ebp - 4], 0 // 7d05 | jge 7 // 83c8ff | or eax, 0xffffffff // eb25 | jmp 0x27 // 837dfc00 | cmp dword ptr [ebp - 4], 0 $sequence_6 = { 7527 8b55fc 0fbe4202 83f82d 751b } // n = 5, score = 100 // 7527 | jne 0x29 // 8b55fc | mov edx, dword ptr [ebp - 4] // 0fbe4202 | movsx eax, byte ptr [edx + 2] // 83f82d | cmp eax, 0x2d // 751b | jne 0x1d $sequence_7 = { 51 ff15???????? 8945f0 837df000 7511 8b55f8 52 } // n = 7, score = 100 // 51 | push ecx // ff15???????? | // 8945f0 | mov dword ptr [ebp - 0x10], eax // 837df000 | cmp dword ptr [ebp - 0x10], 0 // 7511 | jne 0x13 // 8b55f8 | mov edx, dword ptr [ebp - 8] // 52 | push edx $sequence_8 = { 8b5508 83c234 83c9ff 33c0 } // n = 4, score = 100 // 8b5508 | mov edx, dword ptr [ebp + 8] // 83c234 | add edx, 0x34 // 83c9ff | or ecx, 0xffffffff // 33c0 | xor eax, eax $sequence_9 = { 8bec 83ec30 53 56 57 8b4508 8945e0 } // n = 7, score = 100 // 8bec | mov ebp, esp // 83ec30 | sub esp, 0x30 // 53 | push ebx // 56 | push esi // 57 | push edi // 8b4508 | mov eax, dword ptr [ebp + 8] // 8945e0 | mov dword ptr [ebp - 0x20], eax condition: 7 of them and filesize < 114688 }
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