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rule win_qadars_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.qadars." 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.qadars" malpedia_rule_date = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { 57 56 8b7df0 48 8b75e4 b940000000 8bc1 } // n = 7, score = 700 // 57 | push edi // 56 | push esi // 8b7df0 | mov edi, dword ptr [ebp - 0x10] // 48 | dec eax // 8b75e4 | mov esi, dword ptr [ebp - 0x1c] // b940000000 | mov ecx, 0x40 // 8bc1 | mov eax, ecx $sequence_1 = { 57 56 6802000080 e8???????? 83c434 8945ec 895df0 } // n = 7, score = 700 // 57 | push edi // 56 | push esi // 6802000080 | push 0x80000002 // e8???????? | // 83c434 | add esp, 0x34 // 8945ec | mov dword ptr [ebp - 0x14], eax // 895df0 | mov dword ptr [ebp - 0x10], ebx $sequence_2 = { 57 57 57 8d4de8 51 57 57 } // n = 7, score = 700 // 57 | push edi // 57 | push edi // 57 | push edi // 8d4de8 | lea ecx, [ebp - 0x18] // 51 | push ecx // 57 | push edi // 57 | push edi $sequence_3 = { 57 56 e8???????? 837e0c00 8bf8 7409 ff4e0c } // n = 7, score = 700 // 57 | push edi // 56 | push esi // e8???????? | // 837e0c00 | cmp dword ptr [esi + 0xc], 0 // 8bf8 | mov edi, eax // 7409 | je 0xb // ff4e0c | dec dword ptr [esi + 0xc] $sequence_4 = { 57 56 8b7dd8 48 8b75a4 b916000000 8bc1 } // n = 7, score = 700 // 57 | push edi // 56 | push esi // 8b7dd8 | mov edi, dword ptr [ebp - 0x28] // 48 | dec eax // 8b75a4 | mov esi, dword ptr [ebp - 0x5c] // b916000000 | mov ecx, 0x16 // 8bc1 | mov eax, ecx $sequence_5 = { 57 57 57 8d45f8 50 57 57 } // n = 7, score = 700 // 57 | push edi // 57 | push edi // 57 | push edi // 8d45f8 | lea eax, [ebp - 8] // 50 | push eax // 57 | push edi // 57 | push edi $sequence_6 = { 57 57 895dfc 897df8 e8???????? } // n = 5, score = 700 // 57 | push edi // 57 | push edi // 895dfc | mov dword ptr [ebp - 4], ebx // 897df8 | mov dword ptr [ebp - 8], edi // e8???????? | $sequence_7 = { 57 56 e8???????? 83c404 52 50 e8???????? } // n = 7, score = 700 // 57 | push edi // 56 | push esi // e8???????? | // 83c404 | add esp, 4 // 52 | push edx // 50 | push eax // e8???????? | $sequence_8 = { 6a00 8d4df4 51 6a04 8d55f8 52 } // n = 6, score = 600 // 6a00 | push 0 // 8d4df4 | lea ecx, [ebp - 0xc] // 51 | push ecx // 6a04 | push 4 // 8d55f8 | lea edx, [ebp - 8] // 52 | push edx $sequence_9 = { 6a01 8b55fc 52 ff15???????? 83c408 } // n = 5, score = 300 // 6a01 | push 1 // 8b55fc | mov edx, dword ptr [ebp - 4] // 52 | push edx // ff15???????? | // 83c408 | add esp, 8 $sequence_10 = { 83c40c 6805010000 8d8df8feffff 51 } // n = 4, score = 300 // 83c40c | add esp, 0xc // 6805010000 | push 0x105 // 8d8df8feffff | lea ecx, [ebp - 0x108] // 51 | push ecx $sequence_11 = { 6a01 6a08 ff15???????? 83c408 } // n = 4, score = 300 // 6a01 | push 1 // 6a08 | push 8 // ff15???????? | // 83c408 | add esp, 8 $sequence_12 = { 51 8b55f0 52 ff15???????? 83c40c } // n = 5, score = 300 // 51 | push ecx // 8b55f0 | mov edx, dword ptr [ebp - 0x10] // 52 | push edx // ff15???????? | // 83c40c | add esp, 0xc $sequence_13 = { 83c408 68???????? 6a01 e8???????? 83c408 8b4dfc } // n = 6, score = 100 // 83c408 | add esp, 8 // 68???????? | // 6a01 | push 1 // e8???????? | // 83c408 | add esp, 8 // 8b4dfc | mov ecx, dword ptr [ebp - 4] $sequence_14 = { 83c408 6804010000 6a00 8b55fc 81c280180000 } // n = 5, score = 100 // 83c408 | add esp, 8 // 6804010000 | push 0x104 // 6a00 | push 0 // 8b55fc | mov edx, dword ptr [ebp - 4] // 81c280180000 | add edx, 0x1880 $sequence_15 = { 83c408 6808020000 6a00 8d8de8fbffff } // n = 4, score = 100 // 83c408 | add esp, 8 // 6808020000 | push 0x208 // 6a00 | push 0 // 8d8de8fbffff | lea ecx, [ebp - 0x418] condition: 7 of them and filesize < 630784 }
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