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rule win_nitol_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.nitol." 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.nitol" malpedia_rule_date = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { ff7508 ff15???????? 8b3d???????? 6a04 6800300000 } // n = 5, score = 200 // ff7508 | push dword ptr [ebp + 8] // ff15???????? | // 8b3d???????? | // 6a04 | push 4 // 6800300000 | push 0x3000 $sequence_1 = { 50 8d8570f9ffff 50 e8???????? 83c414 833d????????01 744a } // n = 7, score = 200 // 50 | push eax // 8d8570f9ffff | lea eax, [ebp - 0x690] // 50 | push eax // e8???????? | // 83c414 | add esp, 0x14 // 833d????????01 | // 744a | je 0x4c $sequence_2 = { 8bf8 8bcf 8b07 ff5068 85c0 8945e8 7457 } // n = 7, score = 200 // 8bf8 | mov edi, eax // 8bcf | mov ecx, edi // 8b07 | mov eax, dword ptr [edi] // ff5068 | call dword ptr [eax + 0x68] // 85c0 | test eax, eax // 8945e8 | mov dword ptr [ebp - 0x18], eax // 7457 | je 0x59 $sequence_3 = { 83c104 57 55 43 894c2418 8901 ffd6 } // n = 7, score = 200 // 83c104 | add ecx, 4 // 57 | push edi // 55 | push ebp // 43 | inc ebx // 894c2418 | mov dword ptr [esp + 0x18], ecx // 8901 | mov dword ptr [ecx], eax // ffd6 | call esi $sequence_4 = { 8b3d???????? ffd7 6a14 99 59 f7f9 8955e8 } // n = 7, score = 200 // 8b3d???????? | // ffd7 | call edi // 6a14 | push 0x14 // 99 | cdq // 59 | pop ecx // f7f9 | idiv ecx // 8955e8 | mov dword ptr [ebp - 0x18], edx $sequence_5 = { 50 ff15???????? 8b45e8 83c40c 8b04859c704000 53 53 } // n = 7, score = 200 // 50 | push eax // ff15???????? | // 8b45e8 | mov eax, dword ptr [ebp - 0x18] // 83c40c | add esp, 0xc // 8b04859c704000 | mov eax, dword ptr [eax*4 + 0x40709c] // 53 | push ebx // 53 | push ebx $sequence_6 = { 53 53 53 53 50 e8???????? 5f } // n = 7, score = 200 // 53 | push ebx // 53 | push ebx // 53 | push ebx // 53 | push ebx // 50 | push eax // e8???????? | // 5f | pop edi $sequence_7 = { 837dec00 75a9 837de800 7585 837de400 0f855bffffff 834dfcff } // n = 7, score = 200 // 837dec00 | cmp dword ptr [ebp - 0x14], 0 // 75a9 | jne 0xffffffab // 837de800 | cmp dword ptr [ebp - 0x18], 0 // 7585 | jne 0xffffff87 // 837de400 | cmp dword ptr [ebp - 0x1c], 0 // 0f855bffffff | jne 0xffffff61 // 834dfcff | or dword ptr [ebp - 4], 0xffffffff $sequence_8 = { 53 ff15???????? e9???????? 6a40 33c0 } // n = 5, score = 200 // 53 | push ebx // ff15???????? | // e9???????? | // 6a40 | push 0x40 // 33c0 | xor eax, eax $sequence_9 = { ffd6 99 b9e8030000 f7f9 8bda 83bd38ffffff01 } // n = 6, score = 200 // ffd6 | call esi // 99 | cdq // b9e8030000 | mov ecx, 0x3e8 // f7f9 | idiv ecx // 8bda | mov ebx, edx // 83bd38ffffff01 | cmp dword ptr [ebp - 0xc8], 1 condition: 7 of them and filesize < 139264 }
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