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rule win_nitlove_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" 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 = "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 = { 8d85c4feffff b902000080 66a5 be???????? 8d7df8 50 8d45f8 } // n = 7, score = 200 // 8d85c4feffff | lea eax, [ebp - 0x13c] // b902000080 | mov ecx, 0x80000002 // 66a5 | movsw word ptr es:[edi], word ptr [esi] // be???????? | // 8d7df8 | lea edi, [ebp - 8] // 50 | push eax // 8d45f8 | lea eax, [ebp - 8] $sequence_1 = { ff15???????? 85c0 74e1 837dfcff } // n = 4, score = 200 // ff15???????? | // 85c0 | test eax, eax // 74e1 | je 0xffffffe3 // 837dfcff | cmp dword ptr [ebp - 4], -1 $sequence_2 = { ffd7 8b75f4 8b4df8 8b859cfaffff 8b95a0faffff 83c010 } // n = 6, score = 200 // ffd7 | call edi // 8b75f4 | mov esi, dword ptr [ebp - 0xc] // 8b4df8 | mov ecx, dword ptr [ebp - 8] // 8b859cfaffff | mov eax, dword ptr [ebp - 0x564] // 8b95a0faffff | mov edx, dword ptr [ebp - 0x560] // 83c010 | add eax, 0x10 $sequence_3 = { 0f853d010000 6a00 56 baf3b33d04 } // n = 4, score = 200 // 0f853d010000 | jne 0x143 // 6a00 | push 0 // 56 | push esi // baf3b33d04 | mov edx, 0x43db3f3 $sequence_4 = { 8945d8 8b4508 8945c0 8b450c } // n = 4, score = 200 // 8945d8 | mov dword ptr [ebp - 0x28], eax // 8b4508 | mov eax, dword ptr [ebp + 8] // 8945c0 | mov dword ptr [ebp - 0x40], eax // 8b450c | mov eax, dword ptr [ebp + 0xc] $sequence_5 = { e8???????? ffd0 bab2bb282b b9???????? } // n = 4, score = 200 // e8???????? | // ffd0 | call eax // bab2bb282b | mov edx, 0x2b28bbb2 // b9???????? | $sequence_6 = { ba7f22fb0e b9???????? e8???????? ffd0 } // n = 4, score = 200 // ba7f22fb0e | mov edx, 0xefb227f // b9???????? | // e8???????? | // ffd0 | call eax $sequence_7 = { 8bcb e8???????? ffd0 ff75fc ba07d457d6 8bcb } // n = 6, score = 200 // 8bcb | mov ecx, ebx // e8???????? | // ffd0 | call eax // ff75fc | push dword ptr [ebp - 4] // ba07d457d6 | mov edx, 0xd657d407 // 8bcb | mov ecx, ebx $sequence_8 = { 0f84aa000000 53 56 57 e8???????? e8???????? 8d45f8 } // n = 7, score = 200 // 0f84aa000000 | je 0xb0 // 53 | push ebx // 56 | push esi // 57 | push edi // e8???????? | // e8???????? | // 8d45f8 | lea eax, [ebp - 8] $sequence_9 = { ffd0 8b4dfc 6a00 8904b1 b9???????? 837dec00 } // n = 6, score = 200 // ffd0 | call eax // 8b4dfc | mov ecx, dword ptr [ebp - 4] // 6a00 | push 0 // 8904b1 | mov dword ptr [ecx + esi*4], eax // b9???????? | // 837dec00 | cmp dword ptr [ebp - 0x14], 0 condition: 7 of them and filesize < 49152 }
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