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rule win_webc2_qbp_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" 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 = "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 = { 85c0 7511 8d85e8fcffff 50 ff15???????? } // n = 5, score = 100 // 85c0 | test eax, eax // 7511 | jne 0x13 // 8d85e8fcffff | lea eax, [ebp - 0x318] // 50 | push eax // ff15???????? | $sequence_1 = { 3b9090830000 0f8e9d000000 8b4df0 8b819c830000 0345fc 6bc003 99 } // n = 7, score = 100 // 3b9090830000 | cmp edx, dword ptr [eax + 0x8390] // 0f8e9d000000 | jle 0xa3 // 8b4df0 | mov ecx, dword ptr [ebp - 0x10] // 8b819c830000 | mov eax, dword ptr [ecx + 0x839c] // 0345fc | add eax, dword ptr [ebp - 4] // 6bc003 | imul eax, eax, 3 // 99 | cdq $sequence_2 = { 83c40c c785e0fcffff01000000 ff15???????? 8985f4feffff 8b95e0fcffff 52 8b85f0feffff } // n = 7, score = 100 // 83c40c | add esp, 0xc // c785e0fcffff01000000 | mov dword ptr [ebp - 0x320], 1 // ff15???????? | // 8985f4feffff | mov dword ptr [ebp - 0x10c], eax // 8b95e0fcffff | mov edx, dword ptr [ebp - 0x320] // 52 | push edx // 8b85f0feffff | mov eax, dword ptr [ebp - 0x110] $sequence_3 = { b9fa000000 2bc8 898dd8fcffff 8b95e8fdffff 52 e8???????? 83c404 } // n = 7, score = 100 // b9fa000000 | mov ecx, 0xfa // 2bc8 | sub ecx, eax // 898dd8fcffff | mov dword ptr [ebp - 0x328], ecx // 8b95e8fdffff | mov edx, dword ptr [ebp - 0x218] // 52 | push edx // e8???????? | // 83c404 | add esp, 4 $sequence_4 = { 83ec0c 56 894df4 66c745fc0000 eb0c 668b45fc 66050100 } // n = 7, score = 100 // 83ec0c | sub esp, 0xc // 56 | push esi // 894df4 | mov dword ptr [ebp - 0xc], ecx // 66c745fc0000 | mov word ptr [ebp - 4], 0 // eb0c | jmp 0xe // 668b45fc | mov ax, word ptr [ebp - 4] // 66050100 | add ax, 1 $sequence_5 = { 85c0 746d 8d4dfc 51 8d55f8 52 e8???????? } // n = 7, score = 100 // 85c0 | test eax, eax // 746d | je 0x6f // 8d4dfc | lea ecx, [ebp - 4] // 51 | push ecx // 8d55f8 | lea edx, [ebp - 8] // 52 | push edx // e8???????? | $sequence_6 = { 8b450c 25ffff0000 50 8b4dec 51 ff15???????? 8945fc } // n = 7, score = 100 // 8b450c | mov eax, dword ptr [ebp + 0xc] // 25ffff0000 | and eax, 0xffff // 50 | push eax // 8b4dec | mov ecx, dword ptr [ebp - 0x14] // 51 | push ecx // ff15???????? | // 8945fc | mov dword ptr [ebp - 4], eax $sequence_7 = { 0fbf4dec 3bc1 7d7d 8b4de4 e8???????? 668945f4 0fbf55f4 } // n = 7, score = 100 // 0fbf4dec | movsx ecx, word ptr [ebp - 0x14] // 3bc1 | cmp eax, ecx // 7d7d | jge 0x7f // 8b4de4 | mov ecx, dword ptr [ebp - 0x1c] // e8???????? | // 668945f4 | mov word ptr [ebp - 0xc], ax // 0fbf55f4 | movsx edx, word ptr [ebp - 0xc] $sequence_8 = { 81eafd000000 668955ec 66c745e80000 eb0c 668b45e8 66050100 668945e8 } // n = 7, score = 100 // 81eafd000000 | sub edx, 0xfd // 668955ec | mov word ptr [ebp - 0x14], dx // 66c745e80000 | mov word ptr [ebp - 0x18], 0 // eb0c | jmp 0xe // 668b45e8 | mov ax, word ptr [ebp - 0x18] // 66050100 | add ax, 1 // 668945e8 | mov word ptr [ebp - 0x18], ax $sequence_9 = { 83bde8fdffff00 7574 6800010000 6a00 8d85ecfdffff 50 } // n = 6, score = 100 // 83bde8fdffff00 | cmp dword ptr [ebp - 0x218], 0 // 7574 | jne 0x76 // 6800010000 | push 0x100 // 6a00 | push 0 // 8d85ecfdffff | lea eax, [ebp - 0x214] // 50 | push eax condition: 7 of them and filesize < 630784 }
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