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rule win_webc2_qbp_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.webc2_qbp." 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_qbp" 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 = { 8d95ecfdffff 52 ff15???????? 33c0 e9???????? 8d85ecfdffff 50 } // n = 7, score = 100 // 8d95ecfdffff | lea edx, [ebp - 0x214] // 52 | push edx // ff15???????? | // 33c0 | xor eax, eax // e9???????? | // 8d85ecfdffff | lea eax, [ebp - 0x214] // 50 | push eax $sequence_1 = { ff15???????? c745d800000000 68???????? ff15???????? 8945d8 837dd800 7414 } // n = 7, score = 100 // ff15???????? | // c745d800000000 | mov dword ptr [ebp - 0x28], 0 // 68???????? | // ff15???????? | // 8945d8 | mov dword ptr [ebp - 0x28], eax // 837dd800 | cmp dword ptr [ebp - 0x28], 0 // 7414 | je 0x16 $sequence_2 = { 52 e8???????? 83c408 85c0 7440 8b45fc } // n = 6, score = 100 // 52 | push edx // e8???????? | // 83c408 | add esp, 8 // 85c0 | test eax, eax // 7440 | je 0x42 // 8b45fc | mov eax, dword ptr [ebp - 4] $sequence_3 = { 83c40c eb62 8b95f0feffff 2b55fc 52 8b85e8fdffff 0345fc } // n = 7, score = 100 // 83c40c | add esp, 0xc // eb62 | jmp 0x64 // 8b95f0feffff | mov edx, dword ptr [ebp - 0x110] // 2b55fc | sub edx, dword ptr [ebp - 4] // 52 | push edx // 8b85e8fdffff | mov eax, dword ptr [ebp - 0x218] // 0345fc | add eax, dword ptr [ebp - 4] $sequence_4 = { 66894dec 66c745f00000 eb0c 668b55f0 } // n = 4, score = 100 // 66894dec | mov word ptr [ebp - 0x14], cx // 66c745f00000 | mov word ptr [ebp - 0x10], 0 // eb0c | jmp 0xe // 668b55f0 | mov dx, word ptr [ebp - 0x10] $sequence_5 = { d1f8 50 ff15???????? 83c404 8945fc 837dfc00 7504 } // n = 7, score = 100 // d1f8 | sar eax, 1 // 50 | push eax // ff15???????? | // 83c404 | add esp, 4 // 8945fc | mov dword ptr [ebp - 4], eax // 837dfc00 | cmp dword ptr [ebp - 4], 0 // 7504 | jne 6 $sequence_6 = { 68???????? 8d854c6cffff 50 e8???????? 83c408 68???????? } // n = 6, score = 100 // 68???????? | // 8d854c6cffff | lea eax, [ebp - 0x93b4] // 50 | push eax // e8???????? | // 83c408 | add esp, 8 // 68???????? | $sequence_7 = { 668b55f0 6683ea01 668955f0 0fbf45f0 0fbf4d08 8b55ec } // n = 6, score = 100 // 668b55f0 | mov dx, word ptr [ebp - 0x10] // 6683ea01 | sub dx, 1 // 668955f0 | mov word ptr [ebp - 0x10], dx // 0fbf45f0 | movsx eax, word ptr [ebp - 0x10] // 0fbf4d08 | movsx ecx, word ptr [ebp + 8] // 8b55ec | mov edx, dword ptr [ebp - 0x14] $sequence_8 = { 668b4df4 6683e902 66894df4 8b55f4 } // n = 4, score = 100 // 668b4df4 | mov cx, word ptr [ebp - 0xc] // 6683e902 | sub cx, 2 // 66894df4 | mov word ptr [ebp - 0xc], cx // 8b55f4 | mov edx, dword ptr [ebp - 0xc] $sequence_9 = { 0fbf5508 0fbf45fc 8b4df8 8b75f8 668b945648100000 6689944148100000 } // n = 6, score = 100 // 0fbf5508 | movsx edx, word ptr [ebp + 8] // 0fbf45fc | movsx eax, word ptr [ebp - 4] // 8b4df8 | mov ecx, dword ptr [ebp - 8] // 8b75f8 | mov esi, dword ptr [ebp - 8] // 668b945648100000 | mov dx, word ptr [esi + edx*2 + 0x1048] // 6689944148100000 | mov word ptr [ecx + eax*2 + 0x1048], dx condition: 7 of them and filesize < 630784 }
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