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rule win_webc2_qbp_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { b940000000 33c0 8dbde9fcffff f3ab 66ab aa c685fcfeffff00 } // n = 7, score = 100 // b940000000 | mov ecx, 0x40 // 33c0 | xor eax, eax // 8dbde9fcffff | lea edi, [ebp - 0x317] // f3ab | rep stosd dword ptr es:[edi], eax // 66ab | stosw word ptr es:[edi], ax // aa | stosb byte ptr es:[edi], al // c685fcfeffff00 | mov byte ptr [ebp - 0x104], 0 $sequence_1 = { 83c001 25ff0f0000 668945f8 0fbf4dfc 83c101 81e1ff0f0000 66894dfc } // n = 7, score = 100 // 83c001 | add eax, 1 // 25ff0f0000 | and eax, 0xfff // 668945f8 | mov word ptr [ebp - 8], ax // 0fbf4dfc | movsx ecx, word ptr [ebp - 4] // 83c101 | add ecx, 1 // 81e1ff0f0000 | and ecx, 0xfff // 66894dfc | mov word ptr [ebp - 4], cx $sequence_2 = { 83ec10 894df0 8b450c 8945fc 8b4df0 8b9188830000 833a00 } // n = 7, score = 100 // 83ec10 | sub esp, 0x10 // 894df0 | mov dword ptr [ebp - 0x10], ecx // 8b450c | mov eax, dword ptr [ebp + 0xc] // 8945fc | mov dword ptr [ebp - 4], eax // 8b4df0 | mov ecx, dword ptr [ebp - 0x10] // 8b9188830000 | mov edx, dword ptr [ecx + 0x8388] // 833a00 | cmp dword ptr [edx], 0 $sequence_3 = { 8b45f0 8b08 894dfc 8b55f0 8b4204 } // n = 5, score = 100 // 8b45f0 | mov eax, dword ptr [ebp - 0x10] // 8b08 | mov ecx, dword ptr [eax] // 894dfc | mov dword ptr [ebp - 4], ecx // 8b55f0 | mov edx, dword ptr [ebp - 0x10] // 8b4204 | mov eax, dword ptr [edx + 4] $sequence_4 = { 8b55fc 8a827c830000 2c08 8b4dfc 88817c830000 8b55fc } // n = 6, score = 100 // 8b55fc | mov edx, dword ptr [ebp - 4] // 8a827c830000 | mov al, byte ptr [edx + 0x837c] // 2c08 | sub al, 8 // 8b4dfc | mov ecx, dword ptr [ebp - 4] // 88817c830000 | mov byte ptr [ecx + 0x837c], al // 8b55fc | mov edx, dword ptr [ebp - 4] $sequence_5 = { 8b5508 52 8b45f0 8b8888830000 8b11 8b45f0 03909c830000 } // n = 7, score = 100 // 8b5508 | mov edx, dword ptr [ebp + 8] // 52 | push edx // 8b45f0 | mov eax, dword ptr [ebp - 0x10] // 8b8888830000 | mov ecx, dword ptr [eax + 0x8388] // 8b11 | mov edx, dword ptr [ecx] // 8b45f0 | mov eax, dword ptr [ebp - 0x10] // 03909c830000 | add edx, dword ptr [eax + 0x839c] $sequence_6 = { 8b45ec 25ffff0000 50 0fbf4df0 8b55e8 } // n = 5, score = 100 // 8b45ec | mov eax, dword ptr [ebp - 0x14] // 25ffff0000 | and eax, 0xffff // 50 | push eax // 0fbf4df0 | movsx ecx, word ptr [ebp - 0x10] // 8b55e8 | mov edx, dword ptr [ebp - 0x18] $sequence_7 = { 894df0 8b450c 8945fc 8b4df0 8b9188830000 833a00 } // n = 6, score = 100 // 894df0 | mov dword ptr [ebp - 0x10], ecx // 8b450c | mov eax, dword ptr [ebp + 0xc] // 8945fc | mov dword ptr [ebp - 4], eax // 8b4df0 | mov ecx, dword ptr [ebp - 0x10] // 8b9188830000 | mov edx, dword ptr [ecx + 0x8388] // 833a00 | cmp dword ptr [edx], 0 $sequence_8 = { 8bec 83ec28 56 57 6804010000 6a00 68???????? } // n = 7, score = 100 // 8bec | mov ebp, esp // 83ec28 | sub esp, 0x28 // 56 | push esi // 57 | push edi // 6804010000 | push 0x104 // 6a00 | push 0 // 68???????? | $sequence_9 = { 668b45f8 50 8b4de4 e8???????? 0fbf4df8 8b55e4 8a45f4 } // n = 7, score = 100 // 668b45f8 | mov ax, word ptr [ebp - 8] // 50 | push eax // 8b4de4 | mov ecx, dword ptr [ebp - 0x1c] // e8???????? | // 0fbf4df8 | movsx ecx, word ptr [ebp - 8] // 8b55e4 | mov edx, dword ptr [ebp - 0x1c] // 8a45f4 | mov al, byte ptr [ebp - 0xc] condition: 7 of them and filesize < 630784 }
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