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rule win_neutrino_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" 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 = "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 = { 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 = { 85c9 7439 8b550c 8955fc 8b45fc 0fbe08 85c9 } // n = 7, score = 1500 // 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] // 85c9 | test ecx, ecx $sequence_4 = { 0fbe02 85c0 7447 8b4df4 0fbe11 8b45fc 0fbe08 } // n = 7, score = 1500 // 0fbe02 | movsx eax, byte ptr [edx] // 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] $sequence_5 = { 0404 0404 0404 0402 0202 0202 } // n = 6, score = 1500 // 0404 | add al, 4 // 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_6 = { 8b4d0c 894dfc 8b55f4 83c201 8955f4 ebaf 8b45f4 } // 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] // 83c201 | add edx, 1 // 8955f4 | mov dword ptr [ebp - 0xc], edx // ebaf | jmp 0xffffffb1 // 8b45f4 | mov eax, dword ptr [ebp - 0xc] $sequence_7 = { 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_8 = { 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_9 = { 51 0fb655e7 52 8b45e0 50 e8???????? } // n = 6, score = 1500 // 51 | push ecx // 0fb655e7 | movzx edx, byte ptr [ebp - 0x19] // 52 | push edx // 8b45e0 | mov eax, dword ptr [ebp - 0x20] // 50 | push eax // e8???????? | $sequence_10 = { 0fbe08 85c9 741b 8b55fc 0fbe02 8b4df8 0fbe11 } // n = 7, score = 1500 // 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] // 8b4df8 | mov ecx, dword ptr [ebp - 8] // 0fbe11 | movsx edx, byte ptr [ecx] $sequence_11 = { 894dfc 8b55fc 0fbe02 85c0 750f 8b4d0c 894dfc } // n = 7, score = 1500 // 894dfc | mov dword ptr [ebp - 4], ecx // 8b55fc | mov edx, dword ptr [ebp - 4] // 0fbe02 | movsx eax, byte ptr [edx] // 85c0 | test eax, eax // 750f | jne 0x11 // 8b4d0c | mov ecx, dword ptr [ebp + 0xc] // 894dfc | mov dword ptr [ebp - 4], ecx $sequence_12 = { 6a00 ff15???????? 6880000000 ff15???????? } // n = 4, score = 1500 // 6a00 | push 0 // ff15???????? | // 6880000000 | push 0x80 // ff15???????? | $sequence_13 = { 010404 0202 020402 0404 } // n = 4, score = 1500 // 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 = { e9???????? 6a01 ff15???????? 85c0 } // n = 4, score = 1500 // e9???????? | // 6a01 | push 1 // ff15???????? | // 85c0 | test eax, eax $sequence_15 = { 52 ff15???????? 83f8ff 7504 32c0 eb02 b001 } // n = 7, score = 1500 // 52 | push edx // ff15???????? | // 83f8ff | cmp eax, -1 // 7504 | jne 6 // 32c0 | xor al, al // eb02 | jmp 4 // b001 | mov al, 1 $sequence_16 = { 894d08 0fb6550c 83fa01 7509 8b4508 83c001 894508 } // n = 7, score = 1500 // 894d08 | mov dword ptr [ebp + 8], ecx // 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 $sequence_17 = { 7407 814a1800300000 f645fe01 0f8494020000 834a1801 8b45f4 } // n = 6, score = 1300 // 7407 | je 9 // 814a1800300000 | or dword ptr [edx + 0x18], 0x3000 // f645fe01 | test byte ptr [ebp - 2], 1 // 0f8494020000 | je 0x29a // 834a1801 | or dword ptr [edx + 0x18], 1 // 8b45f4 | mov eax, dword ptr [ebp - 0xc] $sequence_18 = { 6a1c 5b 8d4de0 51 50 895de0 ff15???????? } // n = 7, score = 1300 // 6a1c | push 0x1c // 5b | pop ebx // 8d4de0 | lea ecx, [ebp - 0x20] // 51 | push ecx // 50 | push eax // 895de0 | mov dword ptr [ebp - 0x20], ebx // ff15???????? | $sequence_19 = { 8a00 ff45f4 8b7218 8ad8 c0eb06 885dfc } // n = 6, score = 1300 // 8a00 | mov al, byte ptr [eax] // ff45f4 | inc dword ptr [ebp - 0xc] // 8b7218 | mov esi, dword ptr [edx + 0x18] // 8ad8 | mov bl, al // c0eb06 | shr bl, 6 // 885dfc | mov byte ptr [ebp - 4], bl $sequence_20 = { 7354 8b3b 0fb6f2 6a05 58 2bc6 8d1437 } // n = 7, score = 1300 // 7354 | jae 0x56 // 8b3b | mov edi, dword ptr [ebx] // 0fb6f2 | movzx esi, dl // 6a05 | push 5 // 58 | pop eax // 2bc6 | sub eax, esi // 8d1437 | lea edx, [edi + esi] $sequence_21 = { 51 ff35???????? c7460480000000 ff15???????? 8906 } // n = 5, score = 1300 // 51 | push ecx // ff35???????? | // c7460480000000 | mov dword ptr [esi + 4], 0x80 // ff15???????? | // 8906 | mov dword ptr [esi], eax $sequence_22 = { 33d2 81e100f0ffff eb08 3bc1 7409 8bd0 } // n = 6, score = 1300 // 33d2 | xor edx, edx // 81e100f0ffff | and ecx, 0xfffff000 // eb08 | jmp 0xa // 3bc1 | cmp eax, ecx // 7409 | je 0xb // 8bd0 | mov edx, eax $sequence_23 = { 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_24 = { 83c120 81fae00f0000 76ea 8b0d???????? 8908 a3???????? 5f } // n = 7, score = 1300 // 83c120 | add ecx, 0x20 // 81fae00f0000 | cmp edx, 0xfe0 // 76ea | jbe 0xffffffec // 8b0d???????? | // 8908 | mov dword ptr [eax], ecx // a3???????? | // 5f | pop edi $sequence_25 = { 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_26 = { 83c40c 6804010000 8d85f8fdffff 50 } // n = 4, score = 1000 // 83c40c | add esp, 0xc // 6804010000 | push 0x104 // 8d85f8fdffff | lea eax, [ebp - 0x208] // 50 | push eax $sequence_27 = { 7507 68???????? eb05 68???????? 50 ff510c } // n = 6, score = 800 // 7507 | jne 9 // 68???????? | // eb05 | jmp 7 // 68???????? | // 50 | push eax // ff510c | call dword ptr [ecx + 0xc] $sequence_28 = { 7522 be???????? ff15???????? 57 8906 ff15???????? 83c604 } // n = 7, score = 800 // 7522 | jne 0x24 // be???????? | // ff15???????? | // 57 | push edi // 8906 | mov dword ptr [esi], eax // ff15???????? | // 83c604 | add esi, 4 $sequence_29 = { 7412 68???????? 50 ff15???????? f7d8 1bc0 } // n = 6, score = 800 // 7412 | je 0x14 // 68???????? | // 50 | push eax // ff15???????? | // f7d8 | neg eax // 1bc0 | sbb eax, eax $sequence_30 = { 57 33ff 393d???????? 7522 be???????? } // n = 5, score = 800 // 57 | push edi // 33ff | xor edi, edi // 393d???????? | // 7522 | jne 0x24 // be???????? | $sequence_31 = { ff15???????? 50 ff15???????? 837dfc00 0f95c0 c9 } // n = 6, score = 800 // ff15???????? | // 50 | push eax // ff15???????? | // 837dfc00 | cmp dword ptr [ebp - 4], 0 // 0f95c0 | setne al // c9 | leave $sequence_32 = { ff750c ff7508 ff15???????? 83f8ff 0f95c0 } // n = 5, score = 800 // ff750c | push dword ptr [ebp + 0xc] // ff7508 | push dword ptr [ebp + 8] // ff15???????? | // 83f8ff | cmp eax, -1 // 0f95c0 | setne al condition: 7 of them and filesize < 507904 }
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