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rule win_neutrino_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2026-09-17" version = "1" description = "Detects win.neutrino." 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.neutrino" malpedia_rule_date = "20260916" malpedia_hash = "53a643781c18e08f4a50949af60172d837a0b6f6" malpedia_version = "20260917" 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 = { ff15???????? c1e010 50 ff15???????? } // n = 4, score = 2300 // ff15???????? | // c1e010 | shl eax, 0x10 // 50 | push eax // ff15???????? | $sequence_1 = { 50 6a05 6a03 e8???????? } // n = 4, score = 1600 // 50 | push eax // 6a05 | push 5 // 6a03 | push 3 // e8???????? | $sequence_2 = { 50 6a0b 6a07 e8???????? } // n = 4, score = 1600 // 50 | push eax // 6a0b | push 0xb // 6a07 | push 7 // e8???????? | $sequence_3 = { e9???????? 6a01 ff15???????? 85c0 } // n = 4, score = 1500 // e9???????? | // 6a01 | push 1 // ff15???????? | // 85c0 | test eax, eax $sequence_4 = { 020402 0404 0404 0404 0404 0404 0403 } // n = 7, score = 1500 // 020402 | add al, byte ptr [edx + eax] // 0404 | add al, 4 // 0404 | add al, 4 // 0404 | add al, 4 // 0404 | add al, 4 // 0404 | add al, 4 // 0403 | add al, 3 $sequence_5 = { 0fbe08 85c9 7439 8b550c 8955fc 8b45fc 0fbe08 } // n = 7, score = 1500 // 0fbe08 | movsx ecx, byte ptr [eax] // 85c9 | test ecx, ecx // 7439 | je 0x3b // 8b550c | mov edx, dword ptr [ebp + 0xc] // 8955fc | mov dword ptr [ebp - 4], edx // 8b45fc | mov eax, dword ptr [ebp - 4] // 0fbe08 | movsx ecx, byte ptr [eax] $sequence_6 = { 83f830 7c0f 0fbe4d08 83f939 } // n = 4, score = 1500 // 83f830 | cmp eax, 0x30 // 7c0f | jl 0x11 // 0fbe4d08 | movsx ecx, byte ptr [ebp + 8] // 83f939 | cmp ecx, 0x39 $sequence_7 = { 83fa01 7509 8b4508 83c001 894508 8b4dfc 3b4d14 } // n = 7, score = 1500 // 83fa01 | cmp edx, 1 // 7509 | jne 0xb // 8b4508 | mov eax, dword ptr [ebp + 8] // 83c001 | add eax, 1 // 894508 | mov dword ptr [ebp + 8], eax // 8b4dfc | mov ecx, dword ptr [ebp - 4] // 3b4d14 | cmp ecx, dword ptr [ebp + 0x14] $sequence_8 = { 85c9 741b 8b55fc 0fbe02 8b4df8 } // n = 5, score = 1500 // 85c9 | test ecx, ecx // 741b | je 0x1d // 8b55fc | mov edx, dword ptr [ebp - 4] // 0fbe02 | movsx eax, byte ptr [edx] // 8b4df8 | mov ecx, dword ptr [ebp - 8] $sequence_9 = { 894dfc 8b55f4 83c201 8955f4 ebaf 8b45f4 a3???????? } // n = 7, score = 1500 // 894dfc | mov dword ptr [ebp - 4], ecx // 8b55f4 | mov edx, dword ptr [ebp - 0xc] // 83c201 | add edx, 1 // 8955f4 | mov dword ptr [ebp - 0xc], edx // ebaf | jmp 0xffffffb1 // 8b45f4 | mov eax, dword ptr [ebp - 0xc] // a3???????? | $sequence_10 = { 0fb6d0 83fa01 7531 8b45fc 83c001 8945fc 8b4d08 } // n = 7, score = 1500 // 0fb6d0 | movzx edx, al // 83fa01 | cmp edx, 1 // 7531 | jne 0x33 // 8b45fc | mov eax, dword ptr [ebp - 4] // 83c001 | add eax, 1 // 8945fc | mov dword ptr [ebp - 4], eax // 8b4d08 | mov ecx, dword ptr [ebp + 8] $sequence_11 = { 85d2 7502 eb02 ebb4 8b45f8 8945f4 8b4d0c } // n = 7, score = 1500 // 85d2 | test edx, edx // 7502 | jne 4 // eb02 | jmp 4 // ebb4 | jmp 0xffffffb6 // 8b45f8 | mov eax, dword ptr [ebp - 8] // 8945f4 | mov dword ptr [ebp - 0xc], eax // 8b4d0c | mov ecx, dword ptr [ebp + 0xc] $sequence_12 = { 6a00 ff15???????? 6880000000 ff15???????? } // n = 4, score = 1500 // 6a00 | push 0 // ff15???????? | // 6880000000 | push 0x80 // ff15???????? | $sequence_13 = { 0404 0404 010404 0202 020402 0404 } // n = 6, score = 1500 // 0404 | add al, 4 // 0404 | add al, 4 // 010404 | add dword ptr [esp + eax], eax // 0202 | add al, byte ptr [edx] // 020402 | add al, byte ptr [edx + eax] // 0404 | add al, 4 $sequence_14 = { 85c0 7447 8b4df4 0fbe11 8b45fc 0fbe08 3bd1 } // n = 7, score = 1500 // 85c0 | test eax, eax // 7447 | je 0x49 // 8b4df4 | mov ecx, dword ptr [ebp - 0xc] // 0fbe11 | movsx edx, byte ptr [ecx] // 8b45fc | mov eax, dword ptr [ebp - 4] // 0fbe08 | movsx ecx, byte ptr [eax] // 3bd1 | cmp edx, ecx $sequence_15 = { 807df900 8b45f0 743f 83e820 741d 48 } // n = 6, score = 1300 // 807df900 | cmp byte ptr [ebp - 7], 0 // 8b45f0 | mov eax, dword ptr [ebp - 0x10] // 743f | je 0x41 // 83e820 | sub eax, 0x20 // 741d | je 0x1f // 48 | dec eax $sequence_16 = { 807dfd01 0f8597000000 e9???????? 2d8c000000 747e 48 48 } // n = 7, score = 1300 // 807dfd01 | cmp byte ptr [ebp - 3], 1 // 0f8597000000 | jne 0x9d // e9???????? | // 2d8c000000 | sub eax, 0x8c // 747e | je 0x80 // 48 | dec eax // 48 | dec eax $sequence_17 = { 884210 43 f645fe40 7411 814a1810010000 8b03 894210 } // n = 7, score = 1300 // 884210 | mov byte ptr [edx + 0x10], al // 43 | inc ebx // f645fe40 | test byte ptr [ebp - 2], 0x40 // 7411 | je 0x13 // 814a1810010000 | or dword ptr [edx + 0x18], 0x110 // 8b03 | mov eax, dword ptr [ebx] // 894210 | mov dword ptr [edx + 0x10], eax $sequence_18 = { 8b00 85c0 75f4 c3 8b4804 890e ff4808 } // n = 7, score = 1300 // 8b00 | mov eax, dword ptr [eax] // 85c0 | test eax, eax // 75f4 | jne 0xfffffff6 // c3 | ret // 8b4804 | mov ecx, dword ptr [eax + 4] // 890e | mov dword ptr [esi], ecx // ff4808 | dec dword ptr [eax + 8] $sequence_19 = { 66894210 83c302 f645fe02 740a 834a1804 8a03 } // n = 6, score = 1300 // 66894210 | mov word ptr [edx + 0x10], ax // 83c302 | add ebx, 2 // f645fe02 | test byte ptr [ebp - 2], 2 // 740a | je 0xc // 834a1804 | or dword ptr [edx + 0x18], 4 // 8a03 | mov al, byte ptr [ebx] $sequence_20 = { 83c304 eb13 f645fe20 740d 814a1804010000 8a03 } // n = 6, score = 1300 // 83c304 | add ebx, 4 // eb13 | jmp 0x15 // f645fe20 | test byte ptr [ebp - 2], 0x20 // 740d | je 0xf // 814a1804010000 | or dword ptr [edx + 0x18], 0x104 // 8a03 | mov al, byte ptr [ebx] $sequence_21 = { bb???????? 8bfa 32c0 c645ff00 895dec c645fb00 } // n = 6, score = 1300 // bb???????? | // 8bfa | mov edi, edx // 32c0 | xor al, al // c645ff00 | mov byte ptr [ebp - 1], 0 // 895dec | mov dword ptr [ebp - 0x14], ebx // c645fb00 | mov byte ptr [ebp - 5], 0 $sequence_22 = { 83c404 85c0 0f95c2 0fb6c2 } // n = 4, score = 1200 // 83c404 | add esp, 4 // 85c0 | test eax, eax // 0f95c2 | setne dl // 0fb6c2 | movzx eax, dl $sequence_23 = { 8d85b8feffff 50 68???????? ff15???????? 8945fc } // n = 5, score = 1100 // 8d85b8feffff | lea eax, [ebp - 0x148] // 50 | push eax // 68???????? | // ff15???????? | // 8945fc | mov dword ptr [ebp - 4], eax $sequence_24 = { 55 8bec 81ecf80f0000 837d0800 } // n = 4, score = 1100 // 55 | push ebp // 8bec | mov ebp, esp // 81ecf80f0000 | sub esp, 0xff8 // 837d0800 | cmp dword ptr [ebp + 8], 0 $sequence_25 = { 83c40c 6804010000 8d85f8fdffff 50 } // n = 4, score = 1000 // 83c40c | add esp, 0xc // 6804010000 | push 0x104 // 8d85f8fdffff | lea eax, [ebp - 0x208] // 50 | push eax $sequence_26 = { ff750c ff7508 ff15???????? 83f8ff 0f95c0 5d c3 } // n = 7, score = 800 // ff750c | push dword ptr [ebp + 0xc] // ff7508 | push dword ptr [ebp + 8] // ff15???????? | // 83f8ff | cmp eax, -1 // 0f95c0 | setne al // 5d | pop ebp // c3 | ret $sequence_27 = { 53 56 57 33ff 393d???????? 7522 } // n = 6, score = 800 // 53 | push ebx // 56 | push esi // 57 | push edi // 33ff | xor edi, edi // 393d???????? | // 7522 | jne 0x24 $sequence_28 = { 85c0 7412 68???????? 50 ff15???????? f7d8 } // n = 6, score = 800 // 85c0 | test eax, eax // 7412 | je 0x14 // 68???????? | // 50 | push eax // ff15???????? | // f7d8 | neg eax $sequence_29 = { ff15???????? 57 8906 ff15???????? 83c604 83c703 } // n = 6, score = 800 // ff15???????? | // 57 | push edi // 8906 | mov dword ptr [esi], eax // ff15???????? | // 83c604 | add esi, 4 // 83c703 | add edi, 3 $sequence_30 = { 33ff 393d???????? 7522 be???????? ff15???????? 57 8906 } // n = 7, score = 800 // 33ff | xor edi, edi // 393d???????? | // 7522 | jne 0x24 // be???????? | // ff15???????? | // 57 | push edi // 8906 | mov dword ptr [esi], eax $sequence_31 = { 50 ff15???????? 50 ff15???????? 837dfc00 0f95c0 c9 } // n = 7, score = 800 // 50 | push eax // ff15???????? | // 50 | push eax // ff15???????? | // 837dfc00 | cmp dword ptr [ebp - 4], 0 // 0f95c0 | setne al // c9 | leave condition: 7 of them and filesize < 507904 }
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