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rule win_nitlove_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" version = "1" description = "Detects win.nitlove." 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.nitlove" malpedia_rule_date = "20220405" malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a" malpedia_version = "20220411" 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 = { 56 8d45f8 be???????? 50 53 53 } // n = 6, score = 200 // 56 | push esi // 8d45f8 | lea eax, dword ptr [ebp - 8] // be???????? | // 50 | push eax // 53 | push ebx // 53 | push ebx $sequence_1 = { 6a1c 8d4db4 ba9749e08e 51 50 } // n = 5, score = 200 // 6a1c | push 0x1c // 8d4db4 | lea ecx, dword ptr [ebp - 0x4c] // ba9749e08e | mov edx, 0x8ee04997 // 51 | push ecx // 50 | push eax $sequence_2 = { 663919 740d 8d54242e 8d4902 42 663919 } // n = 6, score = 200 // 663919 | cmp word ptr [ecx], bx // 740d | je 0xf // 8d54242e | lea edx, dword ptr [esp + 0x2e] // 8d4902 | lea ecx, dword ptr [ecx + 2] // 42 | inc edx // 663919 | cmp word ptr [ecx], bx $sequence_3 = { ba784c98aa e8???????? ffd0 8b542418 8bcb e8???????? } // n = 6, score = 200 // ba784c98aa | mov edx, 0xaa984c78 // e8???????? | // ffd0 | call eax // 8b542418 | mov edx, dword ptr [esp + 0x18] // 8bcb | mov ecx, ebx // e8???????? | $sequence_4 = { 8bf8 2bfe f7df 1bff } // n = 4, score = 200 // 8bf8 | mov edi, eax // 2bfe | sub edi, esi // f7df | neg edi // 1bff | sbb edi, edi $sequence_5 = { 8bcb e8???????? ffd0 8bf0 ba7e003a43 57 } // n = 6, score = 200 // 8bcb | mov ecx, ebx // e8???????? | // ffd0 | call eax // 8bf0 | mov esi, eax // ba7e003a43 | mov edx, 0x433a007e // 57 | push edi $sequence_6 = { 59 66898c450cfeffff 33c9 668994450efeffff baeb9b12fe } // n = 5, score = 200 // 59 | pop ecx // 66898c450cfeffff | mov word ptr [ebp + eax*2 - 0x1f4], cx // 33c9 | xor ecx, ecx // 668994450efeffff | mov word ptr [ebp + eax*2 - 0x1f2], dx // baeb9b12fe | mov edx, 0xfe129beb $sequence_7 = { 83c40c 84c0 7516 56 8d45f8 b901000080 56 } // n = 7, score = 200 // 83c40c | add esp, 0xc // 84c0 | test al, al // 7516 | jne 0x18 // 56 | push esi // 8d45f8 | lea eax, dword ptr [ebp - 8] // b901000080 | mov ecx, 0x80000001 // 56 | push esi $sequence_8 = { 8b4580 8945e4 8b4584 8945e0 8b4598 } // n = 5, score = 200 // 8b4580 | mov eax, dword ptr [ebp - 0x80] // 8945e4 | mov dword ptr [ebp - 0x1c], eax // 8b4584 | mov eax, dword ptr [ebp - 0x7c] // 8945e0 | mov dword ptr [ebp - 0x20], eax // 8b4598 | mov eax, dword ptr [ebp - 0x68] $sequence_9 = { 5a 8818 40 4a 75fa 6a10 59 } // n = 7, score = 200 // 5a | pop edx // 8818 | mov byte ptr [eax], bl // 40 | inc eax // 4a | dec edx // 75fa | jne 0xfffffffc // 6a10 | push 0x10 // 59 | pop ecx condition: 7 of them and filesize < 49152 }
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