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rule win_webc2_qbp_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" 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 = "20220405" malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a" malpedia_version = "20220411" 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 = { 7574 6800010000 6a00 8d85ecfdffff 50 e8???????? 83c40c } // n = 7, score = 100 // 7574 | jne 0x76 // 6800010000 | push 0x100 // 6a00 | push 0 // 8d85ecfdffff | lea eax, dword ptr [ebp - 0x214] // 50 | push eax // e8???????? | // 83c40c | add esp, 0xc $sequence_1 = { c1e010 8b4de4 8b11 0bd0 8b45e4 8910 8b4de4 } // n = 7, score = 100 // c1e010 | shl eax, 0x10 // 8b4de4 | mov ecx, dword ptr [ebp - 0x1c] // 8b11 | mov edx, dword ptr [ecx] // 0bd0 | or edx, eax // 8b45e4 | mov eax, dword ptr [ebp - 0x1c] // 8910 | mov dword ptr [eax], edx // 8b4de4 | mov ecx, dword ptr [ebp - 0x1c] $sequence_2 = { 68???????? 8d85f8feffff 50 e8???????? 83c404 8d8c05f8feffff 038dd8fcffff } // n = 7, score = 100 // 68???????? | // 8d85f8feffff | lea eax, dword ptr [ebp - 0x108] // 50 | push eax // e8???????? | // 83c404 | add esp, 4 // 8d8c05f8feffff | lea ecx, dword ptr [ebp + eax - 0x108] // 038dd8fcffff | add ecx, dword ptr [ebp - 0x328] $sequence_3 = { 8b450c 83c010 8945fc 8b4dfc 51 } // n = 5, score = 100 // 8b450c | mov eax, dword ptr [ebp + 0xc] // 83c010 | add eax, 0x10 // 8945fc | mov dword ptr [ebp - 4], eax // 8b4dfc | mov ecx, dword ptr [ebp - 4] // 51 | push ecx $sequence_4 = { 25ff000000 50 8b4de4 e8???????? 8b4de4 8b11 81e2000000ff } // n = 7, score = 100 // 25ff000000 | and eax, 0xff // 50 | push eax // 8b4de4 | mov ecx, dword ptr [ebp - 0x1c] // e8???????? | // 8b4de4 | mov ecx, dword ptr [ebp - 0x1c] // 8b11 | mov edx, dword ptr [ecx] // 81e2000000ff | and edx, 0xff000000 $sequence_5 = { 51 8b55ec 52 ff15???????? 8945e0 837de800 } // n = 6, score = 100 // 51 | push ecx // 8b55ec | mov edx, dword ptr [ebp - 0x14] // 52 | push edx // ff15???????? | // 8945e0 | mov dword ptr [ebp - 0x20], eax // 837de800 | cmp dword ptr [ebp - 0x18], 0 $sequence_6 = { 51 ff15???????? 6a10 6a00 8d95d8fcffff 52 } // n = 6, score = 100 // 51 | push ecx // ff15???????? | // 6a10 | push 0x10 // 6a00 | push 0 // 8d95d8fcffff | lea edx, dword ptr [ebp - 0x328] // 52 | push edx $sequence_7 = { 0fbf45fc 0fbf4dfc 8b55f8 0fbf8c4a4c520000 8b55f8 8b75f8 } // n = 6, score = 100 // 0fbf45fc | movsx eax, word ptr [ebp - 4] // 0fbf4dfc | movsx ecx, word ptr [ebp - 4] // 8b55f8 | mov edx, dword ptr [ebp - 8] // 0fbf8c4a4c520000 | movsx ecx, word ptr [edx + ecx*2 + 0x524c] // 8b55f8 | mov edx, dword ptr [ebp - 8] // 8b75f8 | mov esi, dword ptr [ebp - 8] $sequence_8 = { 66899144100000 8b55e8 668b45f0 66898246100000 0fbf4df0 83f93c 7c02 } // n = 7, score = 100 // 66899144100000 | mov word ptr [ecx + 0x1044], dx // 8b55e8 | mov edx, dword ptr [ebp - 0x18] // 668b45f0 | mov ax, word ptr [ebp - 0x10] // 66898246100000 | mov word ptr [edx + 0x1046], ax // 0fbf4df0 | movsx ecx, word ptr [ebp - 0x10] // 83f93c | cmp ecx, 0x3c // 7c02 | jl 4 $sequence_9 = { e8???????? 0fbf5508 8b45ec 668b8c501c7c0000 66894d08 0fbf5508 8b45ec } // n = 7, score = 100 // e8???????? | // 0fbf5508 | movsx edx, word ptr [ebp + 8] // 8b45ec | mov eax, dword ptr [ebp - 0x14] // 668b8c501c7c0000 | mov cx, word ptr [eax + edx*2 + 0x7c1c] // 66894d08 | mov word ptr [ebp + 8], cx // 0fbf5508 | movsx edx, word ptr [ebp + 8] // 8b45ec | mov eax, dword ptr [ebp - 0x14] condition: 7 of them and filesize < 630784 }
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