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rule win_webc2_table_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.webc2_table." 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_table" 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 = { 8d85c0feffff 68???????? 50 ff15???????? 59 3bc3 59 } // n = 7, score = 100 // 8d85c0feffff | lea eax, [ebp - 0x140] // 68???????? | // 50 | push eax // ff15???????? | // 59 | pop ecx // 3bc3 | cmp eax, ebx // 59 | pop ecx $sequence_1 = { 33c0 8dbd4dffffff 889d4cffffff f3ab 66ab aa 6a18 } // n = 7, score = 100 // 33c0 | xor eax, eax // 8dbd4dffffff | lea edi, [ebp - 0xb3] // 889d4cffffff | mov byte ptr [ebp - 0xb4], bl // f3ab | rep stosd dword ptr es:[edi], eax // 66ab | stosw word ptr es:[edi], ax // aa | stosb byte ptr es:[edi], al // 6a18 | push 0x18 $sequence_2 = { 7428 8b4df8 81f900100000 7323 8b45fc 50 881c01 } // n = 7, score = 100 // 7428 | je 0x2a // 8b4df8 | mov ecx, dword ptr [ebp - 8] // 81f900100000 | cmp ecx, 0x1000 // 7323 | jae 0x25 // 8b45fc | mov eax, dword ptr [ebp - 4] // 50 | push eax // 881c01 | mov byte ptr [ecx + eax], bl $sequence_3 = { 3bc3 a3???????? 7525 ff35???????? ff15???????? 837df405 } // n = 6, score = 100 // 3bc3 | cmp eax, ebx // a3???????? | // 7525 | jne 0x27 // ff35???????? | // ff15???????? | // 837df405 | cmp dword ptr [ebp - 0xc], 5 $sequence_4 = { 50 e8???????? 56 8d85f4f8ffff 53 50 e8???????? } // n = 7, score = 100 // 50 | push eax // e8???????? | // 56 | push esi // 8d85f4f8ffff | lea eax, [ebp - 0x70c] // 53 | push ebx // 50 | push eax // e8???????? | $sequence_5 = { 3c20 7c08 3c21 7f08 } // n = 4, score = 100 // 3c20 | cmp al, 0x20 // 7c08 | jl 0xa // 3c21 | cmp al, 0x21 // 7f08 | jg 0xa $sequence_6 = { 894dec ffd6 59 3bc3 59 } // n = 5, score = 100 // 894dec | mov dword ptr [ebp - 0x14], ecx // ffd6 | call esi // 59 | pop ecx // 3bc3 | cmp eax, ebx // 59 | pop ecx $sequence_7 = { 57 ff15???????? ff7710 ff15???????? 83c410 } // n = 5, score = 100 // 57 | push edi // ff15???????? | // ff7710 | push dword ptr [edi + 0x10] // ff15???????? | // 83c410 | add esp, 0x10 $sequence_8 = { 68???????? 50 e8???????? 8d85e4feffff 50 8d8570faffff } // n = 6, score = 100 // 68???????? | // 50 | push eax // e8???????? | // 8d85e4feffff | lea eax, [ebp - 0x11c] // 50 | push eax // 8d8570faffff | lea eax, [ebp - 0x590] $sequence_9 = { 894508 8d46ce 50 ffd7 8bf8 8d46cd } // n = 6, score = 100 // 894508 | mov dword ptr [ebp + 8], eax // 8d46ce | lea eax, [esi - 0x32] // 50 | push eax // ffd7 | call edi // 8bf8 | mov edi, eax // 8d46cd | lea eax, [esi - 0x33] condition: 7 of them and filesize < 49152 }
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