Actor(s): Hellsing
There is no description at this point.
rule win_newcore_rat_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.newcore_rat." 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.newcore_rat" 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 = { 8b08 8b11 50 8b4204 ffd0 8d4c2414 e8???????? } // n = 7, score = 100 // 8b08 | mov ecx, dword ptr [eax] // 8b11 | mov edx, dword ptr [ecx] // 50 | push eax // 8b4204 | mov eax, dword ptr [edx + 4] // ffd0 | call eax // 8d4c2414 | lea ecx, [esp + 0x14] // e8???????? | $sequence_1 = { 898670300000 e8???????? 5f 5d b801000000 } // n = 5, score = 100 // 898670300000 | mov dword ptr [esi + 0x3070], eax // e8???????? | // 5f | pop edi // 5d | pop ebp // b801000000 | mov eax, 1 $sequence_2 = { 51 8d4c243c e8???????? 8d4c2414 e8???????? 8b542448 52 } // n = 7, score = 100 // 51 | push ecx // 8d4c243c | lea ecx, [esp + 0x3c] // e8???????? | // 8d4c2414 | lea ecx, [esp + 0x14] // e8???????? | // 8b542448 | mov edx, dword ptr [esp + 0x48] // 52 | push edx $sequence_3 = { 50 8d4c245e 51 6689442460 e8???????? 83c40c 6a30 } // n = 7, score = 100 // 50 | push eax // 8d4c245e | lea ecx, [esp + 0x5e] // 51 | push ecx // 6689442460 | mov word ptr [esp + 0x60], ax // e8???????? | // 83c40c | add esp, 0xc // 6a30 | push 0x30 $sequence_4 = { 6a00 6a00 8d542478 52 6a00 ff15???????? 85c0 } // n = 7, score = 100 // 6a00 | push 0 // 6a00 | push 0 // 8d542478 | lea edx, [esp + 0x78] // 52 | push edx // 6a00 | push 0 // ff15???????? | // 85c0 | test eax, eax $sequence_5 = { 8b442450 e9???????? 6830020000 8d442458 6a00 50 } // n = 6, score = 100 // 8b442450 | mov eax, dword ptr [esp + 0x50] // e9???????? | // 6830020000 | push 0x230 // 8d442458 | lea eax, [esp + 0x58] // 6a00 | push 0 // 50 | push eax $sequence_6 = { 8b8610100000 85c0 740d 50 ffd7 c7861010000000000000 } // n = 6, score = 100 // 8b8610100000 | mov eax, dword ptr [esi + 0x1010] // 85c0 | test eax, eax // 740d | je 0xf // 50 | push eax // ffd7 | call edi // c7861010000000000000 | mov dword ptr [esi + 0x1010], 0 $sequence_7 = { 5b c21000 8d9344020000 68???????? 52 e8???????? 8bf0 } // n = 7, score = 100 // 5b | pop ebx // c21000 | ret 0x10 // 8d9344020000 | lea edx, [ebx + 0x244] // 68???????? | // 52 | push edx // e8???????? | // 8bf0 | mov esi, eax $sequence_8 = { 83c40c 03f9 014c2414 eb04 8b5c240c 014c242c b81f85eb51 } // n = 7, score = 100 // 83c40c | add esp, 0xc // 03f9 | add edi, ecx // 014c2414 | add dword ptr [esp + 0x14], ecx // eb04 | jmp 6 // 8b5c240c | mov ebx, dword ptr [esp + 0xc] // 014c242c | add dword ptr [esp + 0x2c], ecx // b81f85eb51 | mov eax, 0x51eb851f $sequence_9 = { 68???????? 8d9424ac060000 e8???????? 83c408 53 8d8c24a8060000 } // n = 6, score = 100 // 68???????? | // 8d9424ac060000 | lea edx, [esp + 0x6ac] // e8???????? | // 83c408 | add esp, 8 // 53 | push ebx // 8d8c24a8060000 | lea ecx, [esp + 0x6a8] condition: 7 of them and filesize < 581632 }
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