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rule win_neutrino_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2024-10-31" 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 = "20241030" malpedia_hash = "26e26953c49c8efafbf72a38076855d578e0a2e4" malpedia_version = "20241030" 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 6a0b 6a07 e8???????? } // n = 4, score = 1600 // 50 | push eax // 6a0b | push 0xb // 6a07 | push 7 // e8???????? | $sequence_2 = { 50 6a05 6a03 e8???????? } // n = 4, score = 1600 // 50 | push eax // 6a05 | push 5 // 6a03 | push 3 // e8???????? | $sequence_3 = { 0404 0404 0402 0202 0202 } // n = 5, score = 1500 // 0404 | add al, 4 // 0404 | add al, 4 // 0402 | add al, 2 // 0202 | add al, byte ptr [edx] // 0202 | add al, byte ptr [edx] $sequence_4 = { 837d0800 7408 8b4508 a3???????? 8b0d???????? 894df8 eb09 } // n = 7, score = 1500 // 837d0800 | cmp dword ptr [ebp + 8], 0 // 7408 | je 0xa // 8b4508 | mov eax, dword ptr [ebp + 8] // a3???????? | // 8b0d???????? | // 894df8 | mov dword ptr [ebp - 8], ecx // eb09 | jmp 0xb $sequence_5 = { 8b45ac 50 ff15???????? 8945d0 837dd000 } // n = 5, score = 1500 // 8b45ac | mov eax, dword ptr [ebp - 0x54] // 50 | push eax // ff15???????? | // 8945d0 | mov dword ptr [ebp - 0x30], eax // 837dd000 | cmp dword ptr [ebp - 0x30], 0 $sequence_6 = { 0fbe08 3bd1 7513 8b55f4 c60200 8b45f4 83c001 } // n = 7, score = 1500 // 0fbe08 | movsx ecx, byte ptr [eax] // 3bd1 | cmp edx, ecx // 7513 | jne 0x15 // 8b55f4 | mov edx, dword ptr [ebp - 0xc] // c60200 | mov byte ptr [edx], 0 // 8b45f4 | mov eax, dword ptr [ebp - 0xc] // 83c001 | add eax, 1 $sequence_7 = { 8b4df8 0fbe11 3bc2 740b 8b45fc 83c001 8945fc } // n = 7, score = 1500 // 8b4df8 | mov ecx, dword ptr [ebp - 8] // 0fbe11 | movsx edx, byte ptr [ecx] // 3bc2 | cmp eax, edx // 740b | je 0xd // 8b45fc | mov eax, dword ptr [ebp - 4] // 83c001 | add eax, 1 // 8945fc | mov dword ptr [ebp - 4], eax $sequence_8 = { 83c001 8945fc ebdb 8b4dfc 0fbe11 85d2 7502 } // n = 7, score = 1500 // 83c001 | add eax, 1 // 8945fc | mov dword ptr [ebp - 4], eax // ebdb | jmp 0xffffffdd // 8b4dfc | mov ecx, dword ptr [ebp - 4] // 0fbe11 | movsx edx, byte ptr [ecx] // 85d2 | test edx, edx // 7502 | jne 4 $sequence_9 = { 8b4d0c 894dfc 8b55f4 0fbe02 85c0 7447 8b4df4 } // n = 7, score = 1500 // 8b4d0c | mov ecx, dword ptr [ebp + 0xc] // 894dfc | mov dword ptr [ebp - 4], ecx // 8b55f4 | mov edx, dword ptr [ebp - 0xc] // 0fbe02 | movsx eax, byte ptr [edx] // 85c0 | test eax, eax // 7447 | je 0x49 // 8b4df4 | mov ecx, dword ptr [ebp - 0xc] $sequence_10 = { 6a00 6a00 e8???????? 83c40c 0fb6c0 } // n = 5, score = 1500 // 6a00 | push 0 // 6a00 | push 0 // e8???????? | // 83c40c | add esp, 0xc // 0fb6c0 | movzx eax, al $sequence_11 = { e9???????? 6a01 ff15???????? 85c0 } // n = 4, score = 1500 // e9???????? | // 6a01 | push 1 // ff15???????? | // 85c0 | test eax, eax $sequence_12 = { 0404 010404 0202 020402 0404 } // n = 5, score = 1500 // 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_13 = { 8945fc 8b4d08 83c101 894d08 0fb6550c 83fa01 7509 } // n = 7, score = 1500 // 8945fc | mov dword ptr [ebp - 4], eax // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 83c101 | add ecx, 1 // 894d08 | mov dword ptr [ebp + 8], ecx // 0fb6550c | movzx edx, byte ptr [ebp + 0xc] // 83fa01 | cmp edx, 1 // 7509 | jne 0xb $sequence_14 = { 50 ff15???????? 837dfc00 0f95c0 8be5 } // n = 5, score = 1500 // 50 | push eax // ff15???????? | // 837dfc00 | cmp dword ptr [ebp - 4], 0 // 0f95c0 | setne al // 8be5 | mov esp, ebp $sequence_15 = { 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_16 = { 6a00 ff15???????? 6880000000 ff15???????? } // n = 4, score = 1500 // 6a00 | push 0 // ff15???????? | // 6880000000 | push 0x80 // ff15???????? | $sequence_17 = { 8b55f8 83c201 8955f8 8b45f8 0fbe08 85c9 7439 } // n = 7, score = 1500 // 8b55f8 | mov edx, dword ptr [ebp - 8] // 83c201 | add edx, 1 // 8955f8 | mov dword ptr [ebp - 8], edx // 8b45f8 | mov eax, dword ptr [ebp - 8] // 0fbe08 | movsx ecx, byte ptr [eax] // 85c9 | test ecx, ecx // 7439 | je 0x3b $sequence_18 = { 83ec14 8b4508 53 57 6a1c 8945f4 59 } // n = 7, score = 1300 // 83ec14 | sub esp, 0x14 // 8b4508 | mov eax, dword ptr [ebp + 8] // 53 | push ebx // 57 | push edi // 6a1c | push 0x1c // 8945f4 | mov dword ptr [ebp - 0xc], eax // 59 | pop ecx $sequence_19 = { 75f4 c3 8b4804 890e ff4808 897004 751e } // n = 7, score = 1300 // 75f4 | jne 0xfffffff6 // c3 | ret // 8b4804 | mov ecx, dword ptr [eax + 4] // 890e | mov dword ptr [esi], ecx // ff4808 | dec dword ptr [eax + 8] // 897004 | mov dword ptr [eax + 4], esi // 751e | jne 0x20 $sequence_20 = { 7448 f645fe40 7420 f645ff08 0f8485000000 814a1808010000 } // n = 6, score = 1300 // 7448 | je 0x4a // f645fe40 | test byte ptr [ebp - 2], 0x40 // 7420 | je 0x22 // f645ff08 | test byte ptr [ebp - 1], 8 // 0f8485000000 | je 0x8b // 814a1808010000 | or dword ptr [edx + 0x18], 0x108 $sequence_21 = { 0f879a000000 807dfd01 0f8597000000 e9???????? 2d8c000000 747e 48 } // n = 7, score = 1300 // 0f879a000000 | ja 0xa0 // 807dfd01 | cmp byte ptr [ebp - 3], 1 // 0f8597000000 | jne 0x9d // e9???????? | // 2d8c000000 | sub eax, 0x8c // 747e | je 0x80 // 48 | dec eax $sequence_22 = { 807dfd04 c645fc03 0f84ae000000 807dfd05 eb12 807dfd04 } // n = 6, score = 1300 // 807dfd04 | cmp byte ptr [ebp - 3], 4 // c645fc03 | mov byte ptr [ebp - 4], 3 // 0f84ae000000 | je 0xb4 // 807dfd05 | cmp byte ptr [ebp - 3], 5 // eb12 | jmp 0x14 // 807dfd04 | cmp byte ptr [ebp - 3], 4 $sequence_23 = { 83c302 f645fe02 740a 834a1804 8a03 884210 43 } // n = 7, score = 1300 // 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] // 884210 | mov byte ptr [edx + 0x10], al // 43 | inc ebx $sequence_24 = { 7408 83c6fb a5 66a5 eb01 a5 } // n = 6, score = 1300 // 7408 | je 0xa // 83c6fb | add esi, -5 // a5 | movsd dword ptr es:[edi], dword ptr [esi] // 66a5 | movsw word ptr es:[edi], word ptr [esi] // eb01 | jmp 3 // a5 | movsd dword ptr es:[edi], dword ptr [esi] $sequence_25 = { 7409 8bd0 8b00 85c0 75f4 c3 8b4804 } // n = 7, score = 1300 // 7409 | je 0xb // 8bd0 | mov edx, eax // 8b00 | mov eax, dword ptr [eax] // 85c0 | test eax, eax // 75f4 | jne 0xfffffff6 // c3 | ret // 8b4804 | mov ecx, dword ptr [eax + 4] $sequence_26 = { 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_27 = { 83c40c 6804010000 8d85f8fdffff 50 } // n = 4, score = 1000 // 83c40c | add esp, 0xc // 6804010000 | push 0x104 // 8d85f8fdffff | lea eax, [ebp - 0x208] // 50 | push eax $sequence_28 = { ff750c ff7508 ff15???????? 83f8ff 0f95c0 5d } // n = 6, 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 $sequence_29 = { eb05 68???????? 50 ff510c } // n = 4, score = 800 // eb05 | jmp 7 // 68???????? | // 50 | push eax // ff510c | call dword ptr [ecx + 0xc] $sequence_30 = { 57 33ff 393d???????? 7522 be???????? ff15???????? 57 } // n = 7, score = 800 // 57 | push edi // 33ff | xor edi, edi // 393d???????? | // 7522 | jne 0x24 // be???????? | // ff15???????? | // 57 | push edi $sequence_31 = { 50 ff15???????? 6a40 ff75f0 } // n = 4, score = 800 // 50 | push eax // ff15???????? | // 6a40 | push 0x40 // ff75f0 | push dword ptr [ebp - 0x10] $sequence_32 = { 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_33 = { ff15???????? 6a64 e8???????? 59 } // n = 4, score = 800 // ff15???????? | // 6a64 | push 0x64 // e8???????? | // 59 | pop ecx condition: 7 of them and filesize < 507904 }
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