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rule win_neutrino_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-11-21" 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 = "20221118" malpedia_hash = "e0702e2e6d1d00da65c8a29a4ebacd0a4c59e1af" malpedia_version = "20221125" 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 = { 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_4 = { 8b55f4 0fbe02 85c0 7447 8b4df4 } // n = 5, score = 1500 // 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_5 = { 51 e8???????? 83c404 0fb6d0 83fa01 7531 8b45fc } // n = 7, score = 1500 // 51 | push ecx // e8???????? | // 83c404 | add esp, 4 // 0fb6d0 | movzx edx, al // 83fa01 | cmp edx, 1 // 7531 | jne 0x33 // 8b45fc | mov eax, dword ptr [ebp - 4] $sequence_6 = { 8b4dfc 0fbe11 85d2 7502 eb02 ebb4 8b45f8 } // n = 7, score = 1500 // 8b4dfc | mov ecx, dword ptr [ebp - 4] // 0fbe11 | movsx edx, byte ptr [ecx] // 85d2 | test edx, edx // 7502 | jne 4 // eb02 | jmp 4 // ebb4 | jmp 0xffffffb6 // 8b45f8 | mov eax, dword ptr [ebp - 8] $sequence_7 = { 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_8 = { 0404 0404 010404 0202 } // n = 4, score = 1500 // 0404 | add al, 4 // 0404 | add al, 4 // 010404 | add dword ptr [esp + eax], eax // 0202 | add al, byte ptr [edx] $sequence_9 = { e9???????? 6a01 ff15???????? 85c0 } // n = 4, score = 1500 // e9???????? | // 6a01 | push 1 // ff15???????? | // 85c0 | test eax, eax $sequence_10 = { 6a00 e8???????? 83c40c 0fb6c0 } // n = 4, score = 1500 // 6a00 | push 0 // e8???????? | // 83c40c | add esp, 0xc // 0fb6c0 | movzx eax, al $sequence_11 = { 7408 8b4508 a3???????? 8b0d???????? 894df8 eb09 8b55f8 } // n = 7, score = 1500 // 7408 | je 0xa // 8b4508 | mov eax, dword ptr [ebp + 8] // a3???????? | // 8b0d???????? | // 894df8 | mov dword ptr [ebp - 8], ecx // eb09 | jmp 0xb // 8b55f8 | mov edx, dword ptr [ebp - 8] $sequence_12 = { 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_13 = { 85c0 750f 8b4d0c 894dfc 8b55f4 83c201 8955f4 } // n = 7, score = 1500 // 85c0 | test eax, eax // 750f | jne 0x11 // 8b4d0c | mov ecx, dword ptr [ebp + 0xc] // 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 $sequence_14 = { 8955fc 8b45fc 0fbe08 85c9 741b 8b55fc 0fbe02 } // n = 7, score = 1500 // 8955fc | mov dword ptr [ebp - 4], edx // 8b45fc | mov eax, dword ptr [ebp - 4] // 0fbe08 | movsx ecx, byte ptr [eax] // 85c9 | test ecx, ecx // 741b | je 0x1d // 8b55fc | mov edx, dword ptr [ebp - 4] // 0fbe02 | movsx eax, byte ptr [edx] $sequence_15 = { 6a00 ff15???????? 6880000000 ff15???????? } // n = 4, score = 1500 // 6a00 | push 0 // ff15???????? | // 6880000000 | push 0x80 // ff15???????? | $sequence_16 = { 0404 010404 0202 020402 0404 0404 } // n = 6, 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 // 0404 | add al, 4 $sequence_17 = { 0fb6550c 83fa01 7509 8b4508 83c001 894508 8b4dfc } // n = 7, score = 1500 // 0fb6550c | movzx edx, byte ptr [ebp + 0xc] // 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] $sequence_18 = { f645fe02 740a 834a1804 8a03 884210 43 f645fe40 } // n = 7, score = 1300 // 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 // f645fe40 | test byte ptr [ebp - 2], 0x40 $sequence_19 = { 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_20 = { f645fe40 7420 f645ff08 0f8485000000 814a1808010000 668b03 66894210 } // n = 7, score = 1300 // 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 // 668b03 | mov ax, word ptr [ebx] // 66894210 | mov word ptr [edx + 0x10], ax $sequence_21 = { 81e100f0ffff eb08 3bc1 7409 8bd0 8b00 } // n = 6, score = 1300 // 81e100f0ffff | and ecx, 0xfffff000 // eb08 | jmp 0xa // 3bc1 | cmp eax, ecx // 7409 | je 0xb // 8bd0 | mov edx, eax // 8b00 | mov eax, dword ptr [eax] $sequence_22 = { 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_23 = { 0fb6f2 6a05 58 2bc6 8d1437 50 } // n = 6, score = 1300 // 0fb6f2 | movzx esi, dl // 6a05 | push 5 // 58 | pop eax // 2bc6 | sub eax, esi // 8d1437 | lea edx, [edi + esi] // 50 | push eax $sequence_24 = { 48 7406 48 7417 48 753c 807dfd04 } // n = 7, score = 1300 // 48 | dec eax // 7406 | je 8 // 48 | dec eax // 7417 | je 0x19 // 48 | dec eax // 753c | jne 0x3e // 807dfd04 | cmp byte ptr [ebp - 3], 4 $sequence_25 = { 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_26 = { 8d85b8feffff 50 68???????? ff15???????? } // n = 4, score = 1100 // 8d85b8feffff | lea eax, [ebp - 0x148] // 50 | push eax // 68???????? | // ff15???????? | $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 = { 57 8906 ff15???????? 83c604 83c703 81fe???????? 7ce3 } // n = 7, score = 800 // 57 | push edi // 8906 | mov dword ptr [esi], eax // ff15???????? | // 83c604 | add esi, 4 // 83c703 | add edi, 3 // 81fe???????? | // 7ce3 | jl 0xffffffe5 $sequence_29 = { 50 ff15???????? 837dfc00 0f95c0 c9 c3 } // n = 6, score = 800 // 50 | push eax // ff15???????? | // 837dfc00 | cmp dword ptr [ebp - 4], 0 // 0f95c0 | setne al // c9 | leave // c3 | ret $sequence_30 = { 53 56 57 33ff 393d???????? 7522 be???????? } // n = 7, score = 800 // 53 | push ebx // 56 | push esi // 57 | push edi // 33ff | xor edi, edi // 393d???????? | // 7522 | jne 0x24 // be???????? | $sequence_31 = { 6a00 ff7510 ff750c ff7508 ff15???????? 83f8ff 0f95c0 } // n = 7, score = 800 // 6a00 | push 0 // ff7510 | push dword ptr [ebp + 0x10] // ff750c | push dword ptr [ebp + 0xc] // ff7508 | push dword ptr [ebp + 8] // ff15???????? | // 83f8ff | cmp eax, -1 // 0f95c0 | setne al $sequence_32 = { 393d???????? 7522 be???????? ff15???????? 57 8906 } // n = 6, score = 800 // 393d???????? | // 7522 | jne 0x24 // be???????? | // ff15???????? | // 57 | push edi // 8906 | mov dword ptr [esi], eax $sequence_33 = { 85c0 7412 68???????? 50 ff15???????? f7d8 1bc0 } // n = 7, score = 800 // 85c0 | test eax, eax // 7412 | je 0x14 // 68???????? | // 50 | push eax // ff15???????? | // f7d8 | neg eax // 1bc0 | sbb eax, eax condition: 7 of them and filesize < 507904 }
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