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 = "2023-01-25" 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 = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { 85c0 741a 6a01 50 55 ff15???????? } // n = 6, score = 100 // 85c0 | test eax, eax // 741a | je 0x1c // 6a01 | push 1 // 50 | push eax // 55 | push ebp // ff15???????? | $sequence_1 = { 85c0 7442 6a04 8d4c2418 51 6a4a 53 } // n = 7, score = 100 // 85c0 | test eax, eax // 7442 | je 0x44 // 6a04 | push 4 // 8d4c2418 | lea ecx, [esp + 0x18] // 51 | push ecx // 6a4a | push 0x4a // 53 | push ebx $sequence_2 = { 8b442418 8b4808 6a00 6a01 8d54241f 52 } // n = 6, score = 100 // 8b442418 | mov eax, dword ptr [esp + 0x18] // 8b4808 | mov ecx, dword ptr [eax + 8] // 6a00 | push 0 // 6a01 | push 1 // 8d54241f | lea edx, [esp + 0x1f] // 52 | push edx $sequence_3 = { 03c2 8bd3 c1f805 8bca 0fafc8 03c9 03c9 } // n = 7, score = 100 // 03c2 | add eax, edx // 8bd3 | mov edx, ebx // c1f805 | sar eax, 5 // 8bca | mov ecx, edx // 0fafc8 | imul ecx, eax // 03c9 | add ecx, ecx // 03c9 | add ecx, ecx $sequence_4 = { 85c0 748b 8d4c2418 e8???????? 8d4c2418 c7842478080000ffffffff e8???????? } // n = 7, score = 100 // 85c0 | test eax, eax // 748b | je 0xffffff8d // 8d4c2418 | lea ecx, [esp + 0x18] // e8???????? | // 8d4c2418 | lea ecx, [esp + 0x18] // c7842478080000ffffffff | mov dword ptr [esp + 0x878], 0xffffffff // e8???????? | $sequence_5 = { 8b8510100000 3bc3 7409 50 ffd6 899d10100000 8b850c100000 } // n = 7, score = 100 // 8b8510100000 | mov eax, dword ptr [ebp + 0x1010] // 3bc3 | cmp eax, ebx // 7409 | je 0xb // 50 | push eax // ffd6 | call esi // 899d10100000 | mov dword ptr [ebp + 0x1010], ebx // 8b850c100000 | mov eax, dword ptr [ebp + 0x100c] $sequence_6 = { 8d942478140000 56 52 e8???????? 8b7c2458 83c410 } // n = 6, score = 100 // 8d942478140000 | lea edx, [esp + 0x1478] // 56 | push esi // 52 | push edx // e8???????? | // 8b7c2458 | mov edi, dword ptr [esp + 0x58] // 83c410 | add esp, 0x10 $sequence_7 = { 8b4500 8b5038 6830020000 8d4c2458 51 8bcd } // n = 6, score = 100 // 8b4500 | mov eax, dword ptr [ebp] // 8b5038 | mov edx, dword ptr [eax + 0x38] // 6830020000 | push 0x230 // 8d4c2458 | lea ecx, [esp + 0x58] // 51 | push ecx // 8bcd | mov ecx, ebp $sequence_8 = { 8d442410 50 8bf9 55 897c2414 89742418 } // n = 6, score = 100 // 8d442410 | lea eax, [esp + 0x10] // 50 | push eax // 8bf9 | mov edi, ecx // 55 | push ebp // 897c2414 | mov dword ptr [esp + 0x14], edi // 89742418 | mov dword ptr [esp + 0x18], esi $sequence_9 = { 6858020000 8d4c241c 51 56 8984243c020000 c7450058020000 e8???????? } // n = 7, score = 100 // 6858020000 | push 0x258 // 8d4c241c | lea ecx, [esp + 0x1c] // 51 | push ecx // 56 | push esi // 8984243c020000 | mov dword ptr [esp + 0x23c], eax // c7450058020000 | mov dword ptr [ebp], 0x258 // e8???????? | condition: 7 of them and filesize < 581632 }
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