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rule win_bart_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-12-22" version = "1" description = "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.bart" malpedia_rule_date = "20201222" malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130" malpedia_version = "20201023" 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 = { 773f 7205 80c1ff 79ec 33d2 8bce } // n = 6, score = 100 // 773f | ja 0x41 // 7205 | jb 7 // 80c1ff | add cl, 0xff // 79ec | jns 0xffffffee // 33d2 | xor edx, edx // 8bce | mov ecx, esi $sequence_1 = { e8???????? 8d857cffffff 50 8d855cffffff } // n = 4, score = 100 // e8???????? | // 8d857cffffff | lea eax, [ebp - 0x84] // 50 | push eax // 8d855cffffff | lea eax, [ebp - 0xa4] $sequence_2 = { 8d45bc 50 8b83b0000000 ffd0 0fb603 8d951cffffff } // n = 6, score = 100 // 8d45bc | lea eax, [ebp - 0x44] // 50 | push eax // 8b83b0000000 | mov eax, dword ptr [ebx + 0xb0] // ffd0 | call eax // 0fb603 | movzx eax, byte ptr [ebx] // 8d951cffffff | lea edx, [ebp - 0xe4] $sequence_3 = { bb???????? 8bce 2bde 8d7a08 8b31 8bc6 2b0419 } // n = 7, score = 100 // bb???????? | // 8bce | mov ecx, esi // 2bde | sub ebx, esi // 8d7a08 | lea edi, [edx + 8] // 8b31 | mov esi, dword ptr [ecx] // 8bc6 | mov eax, esi // 2b0419 | sub eax, dword ptr [ecx + ebx] $sequence_4 = { 8d45dc 50 8b83b0000000 ffd0 0fb603 8d4d9c 8b7598 } // n = 7, score = 100 // 8d45dc | lea eax, [ebp - 0x24] // 50 | push eax // 8b83b0000000 | mov eax, dword ptr [ebx + 0xb0] // ffd0 | call eax // 0fb603 | movzx eax, byte ptr [ebx] // 8d4d9c | lea ecx, [ebp - 0x64] // 8b7598 | mov esi, dword ptr [ebp - 0x68] $sequence_5 = { 5b 8b4204 2b02 99 f7fb 6bc00c 0307 } // n = 7, score = 100 // 5b | pop ebx // 8b4204 | mov eax, dword ptr [edx + 4] // 2b02 | sub eax, dword ptr [edx] // 99 | cdq // f7fb | idiv ebx // 6bc00c | imul eax, eax, 0xc // 0307 | add eax, dword ptr [edi] $sequence_6 = { 4e 75e5 8b5d94 8b7598 33c0 8bce } // n = 6, score = 100 // 4e | dec esi // 75e5 | jne 0xffffffe7 // 8b5d94 | mov ebx, dword ptr [ebp - 0x6c] // 8b7598 | mov esi, dword ptr [ebp - 0x68] // 33c0 | xor eax, eax // 8bce | mov ecx, esi $sequence_7 = { 83ec18 56 33f6 8975dc 8975e0 } // n = 5, score = 100 // 83ec18 | sub esp, 0x18 // 56 | push esi // 33f6 | xor esi, esi // 8975dc | mov dword ptr [ebp - 0x24], esi // 8975e0 | mov dword ptr [ebp - 0x20], esi $sequence_8 = { 50 e8???????? 8d8d38feffff 51 ff30 } // n = 5, score = 100 // 50 | push eax // e8???????? | // 8d8d38feffff | lea ecx, [ebp - 0x1c8] // 51 | push ecx // ff30 | push dword ptr [eax] $sequence_9 = { ff75fc ff15???????? ff75fc ff15???????? 53 56 57 } // n = 7, score = 100 // ff75fc | push dword ptr [ebp - 4] // ff15???????? | // ff75fc | push dword ptr [ebp - 4] // ff15???????? | // 53 | push ebx // 56 | push esi // 57 | push edi condition: 7 of them and filesize < 163840 }
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