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rule win_qaccel_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.qaccel." 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.qaccel" 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 = { 68???????? 50 64892500000000 56 57 8bf9 0f8816000000 } // n = 7, score = 100 // 68???????? | // 50 | push eax // 64892500000000 | mov dword ptr fs:[0], esp // 56 | push esi // 57 | push edi // 8bf9 | mov edi, ecx // 0f8816000000 | js 0x1c $sequence_1 = { 5f 5f 5f 5f 5f b801000000 5e } // n = 7, score = 100 // 5f | pop edi // 5f | pop edi // 5f | pop edi // 5f | pop edi // 5f | pop edi // b801000000 | mov eax, 1 // 5e | pop esi $sequence_2 = { 53 03c6 51 50 c7450c00000000 } // n = 5, score = 100 // 53 | push ebx // 03c6 | add eax, esi // 51 | push ecx // 50 | push eax // c7450c00000000 | mov dword ptr [ebp + 0xc], 0 $sequence_3 = { 83cbff 0f8819000000 0f8913000000 5f 5f 5f 5f } // n = 7, score = 100 // 83cbff | or ebx, 0xffffffff // 0f8819000000 | js 0x1f // 0f8913000000 | jns 0x19 // 5f | pop edi // 5f | pop edi // 5f | pop edi // 5f | pop edi $sequence_4 = { 8b4020 6a05 50 ffd6 50 e8???????? 8b4820 } // n = 7, score = 100 // 8b4020 | mov eax, dword ptr [eax + 0x20] // 6a05 | push 5 // 50 | push eax // ffd6 | call esi // 50 | push eax // e8???????? | // 8b4820 | mov ecx, dword ptr [eax + 0x20] $sequence_5 = { 8d55e8 51 52 ff15???????? 8b45fc 8b4df8 6a00 } // n = 7, score = 100 // 8d55e8 | lea edx, [ebp - 0x18] // 51 | push ecx // 52 | push edx // ff15???????? | // 8b45fc | mov eax, dword ptr [ebp - 4] // 8b4df8 | mov ecx, dword ptr [ebp - 8] // 6a00 | push 0 $sequence_6 = { 50 ffd6 50 e8???????? 0fbe4dff 8b5020 6801001c00 } // n = 7, score = 100 // 50 | push eax // ffd6 | call esi // 50 | push eax // e8???????? | // 0fbe4dff | movsx ecx, byte ptr [ebp - 1] // 8b5020 | mov edx, dword ptr [eax + 0x20] // 6801001c00 | push 0x1c0001 $sequence_7 = { 5f 5f 5f 68???????? ff15???????? 85c0 } // n = 6, score = 100 // 5f | pop edi // 5f | pop edi // 5f | pop edi // 68???????? | // ff15???????? | // 85c0 | test eax, eax $sequence_8 = { 5f 5f 5f 5f 6a00 50 } // n = 6, score = 100 // 5f | pop edi // 5f | pop edi // 5f | pop edi // 5f | pop edi // 6a00 | push 0 // 50 | push eax $sequence_9 = { 5f 5f 5f 66a1???????? 8b3d???????? 6800010000 668903 } // n = 7, score = 100 // 5f | pop edi // 5f | pop edi // 5f | pop edi // 66a1???????? | // 8b3d???????? | // 6800010000 | push 0x100 // 668903 | mov word ptr [ebx], ax condition: 7 of them and filesize < 106496 }
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