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rule win_neutrino_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2019-07-05" version = "1" description = "autogenerated rule brought to you by yara-signator" tool = "yara-signator 0.2a" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.neutrino" malpedia_version = "20190620" 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 / approach 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 = { 74?? 8d45fc 50 ff15???????? 50 ff15???????? 837dfc00 } // n = 7, score = 2300 // 74?? | // 8d45fc | lea eax, [ebp - 4] // 50 | push eax // ff15???????? | // 50 | push eax // ff15???????? | // 837dfc00 | cmp dword ptr [ebp - 4], 0 $sequence_1 = { 74?? 8d45fc 50 ff15???????? 50 ff15???????? 837dfc00 } // n = 7, score = 2300 // 74?? | // 8d45fc | lea eax, [ebp - 4] // 50 | push eax // ff15???????? | // 50 | push eax // ff15???????? | // 837dfc00 | cmp dword ptr [ebp - 4], 0 $sequence_2 = { 74?? 8d45fc 50 ff15???????? 50 ff15???????? 837dfc00 } // n = 7, score = 2300 // 74?? | // 8d45fc | lea eax, [ebp - 4] // 50 | push eax // ff15???????? | // 50 | push eax // ff15???????? | // 837dfc00 | cmp dword ptr [ebp - 4], 0 $sequence_3 = { ff15???????? 837dfc00 0f95c0 8be5 } // n = 4, score = 1500 // ff15???????? | // 837dfc00 | cmp dword ptr [ebp - 4], 0 // 0f95c0 | setne al // 8be5 | mov esp, ebp $sequence_4 = { 6a00 ff15???????? 6880000000 ff15???????? } // n = 4, score = 1500 // 6a00 | push 0 // ff15???????? | // 6880000000 | push 0x80 // ff15???????? | $sequence_5 = { 8b4dfc 3b4d14 7e?? 83c8ff eb?? eb?? 0fb65510 } // n = 7, score = 1500 // 8b4dfc | mov ecx, dword ptr [ebp - 4] // 3b4d14 | cmp ecx, dword ptr [ebp + 0x14] // 7e?? | // 83c8ff | or eax, 0xffffffff // eb?? | // eb?? | // 0fb65510 | movzx edx, byte ptr [ebp + 0x10] $sequence_6 = { 8b4d0c 894dfc 8b55f4 83c201 8955f4 eb?? } // n = 6, 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 // eb?? | $sequence_7 = { 8b4508 83c001 894508 8b4dfc 3b4d14 7e?? } // n = 6, score = 1500 // 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] // 7e?? | $sequence_8 = { 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_9 = { 8945fc 8b4d08 83c101 894d08 0fb6550c 83fa01 75?? } // 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 // 75?? | $sequence_10 = { 8b55f4 0fbe02 85c0 74?? 8b4df4 0fbe11 8b45fc } // n = 7, score = 1500 // 8b55f4 | mov edx, dword ptr [ebp - 0xc] // 0fbe02 | movsx eax, byte ptr [edx] // 85c0 | test eax, eax // 74?? | // 8b4df4 | mov ecx, dword ptr [ebp - 0xc] // 0fbe11 | movsx edx, byte ptr [ecx] // 8b45fc | mov eax, dword ptr [ebp - 4] $sequence_11 = { 50 ff15???????? 50 ff15???????? 837dfc00 0f95c0 8be5 } // n = 7, score = 1500 // 50 | push eax // ff15???????? | // 50 | push eax // ff15???????? | // 837dfc00 | cmp dword ptr [ebp - 4], 0 // 0f95c0 | setne al // 8be5 | mov esp, ebp $sequence_12 = { 83fa01 75?? 8b45fc 83c001 8945fc } // n = 5, score = 1500 // 83fa01 | cmp edx, 1 // 75?? | // 8b45fc | mov eax, dword ptr [ebp - 4] // 83c001 | add eax, 1 // 8945fc | mov dword ptr [ebp - 4], eax $sequence_13 = { ff15???????? 50 ff15???????? 837dfc00 0f95c0 8be5 } // n = 6, score = 1500 // ff15???????? | // 50 | push eax // ff15???????? | // 837dfc00 | cmp dword ptr [ebp - 4], 0 // 0f95c0 | setne al // 8be5 | mov esp, ebp $sequence_14 = { 83c101 894d08 0fb6550c 83fa01 75?? 8b4508 83c001 } // n = 7, score = 1500 // 83c101 | add ecx, 1 // 894d08 | mov dword ptr [ebp + 8], ecx // 0fb6550c | movzx edx, byte ptr [ebp + 0xc] // 83fa01 | cmp edx, 1 // 75?? | // 8b4508 | mov eax, dword ptr [ebp + 8] // 83c001 | add eax, 1 $sequence_15 = { e9???????? 6a01 ff15???????? 85c0 } // n = 4, score = 1500 // e9???????? | // 6a01 | push 1 // ff15???????? | // 85c0 | test eax, eax $sequence_16 = { 668b03 66894210 83c302 f645fe02 74?? 834a1804 } // n = 6, score = 1300 // 668b03 | mov ax, word ptr [ebx] // 66894210 | mov word ptr [edx + 0x10], ax // 83c302 | add ebx, 2 // f645fe02 | test byte ptr [ebp - 2], 2 // 74?? | // 834a1804 | or dword ptr [edx + 0x18], 4 $sequence_17 = { c645fc03 0f8????????? 807dfd05 eb?? 807dfd04 } // n = 5, score = 1300 // c645fc03 | mov byte ptr [ebp - 4], 3 // 0f8????????? | // 807dfd05 | cmp byte ptr [ebp - 3], 5 // eb?? | // 807dfd04 | cmp byte ptr [ebp - 3], 4 $sequence_18 = { 74?? 8bd0 8b00 85c0 75?? c3 8b4804 } // n = 7, score = 1300 // 74?? | // 8bd0 | mov edx, eax // 8b00 | mov eax, dword ptr [eax] // 85c0 | test eax, eax // 75?? | // c3 | ret // 8b4804 | mov ecx, dword ptr [eax + 4] $sequence_19 = { 68fa000000 ff15???????? eb?? 6a10 } // n = 4, score = 1300 // 68fa000000 | push 0xfa // ff15???????? | // eb?? | // 6a10 | push 0x10 $sequence_20 = { 8b4508 53 57 6a1c } // n = 4, score = 1300 // 8b4508 | mov eax, dword ptr [ebp + 8] // 53 | push ebx // 57 | push edi // 6a1c | push 0x1c $sequence_21 = { c3 8b4804 890e ff4808 } // n = 4, score = 1300 // c3 | ret // 8b4804 | mov ecx, dword ptr [eax + 4] // 890e | mov dword ptr [esi], ecx // ff4808 | dec dword ptr [eax + 8] $sequence_22 = { 68fa000000 ff15???????? eb?? 6a10 } // n = 4, score = 1300 // 68fa000000 | push 0xfa // ff15???????? | // eb?? | // 6a10 | push 0x10 $sequence_23 = { 8d4de0 51 50 895de0 ff15???????? e9???????? 837de010 } // n = 7, score = 1300 // 8d4de0 | lea ecx, [ebp - 0x20] // 51 | push ecx // 50 | push eax // 895de0 | mov dword ptr [ebp - 0x20], ebx // ff15???????? | // e9???????? | // 837de010 | cmp dword ptr [ebp - 0x20], 0x10 $sequence_24 = { 73?? 8b3b 0fb6f2 6a05 58 } // n = 5, score = 1300 // 73?? | // 8b3b | mov edi, dword ptr [ebx] // 0fb6f2 | movzx esi, dl // 6a05 | push 5 // 58 | pop eax $sequence_25 = { 6800020000 51 ff35???????? c7460480000000 } // n = 4, score = 1300 // 6800020000 | push 0x200 // 51 | push ecx // ff35???????? | // c7460480000000 | mov dword ptr [esi + 4], 0x80 $sequence_26 = { 83c404 85c0 0f95c2 0fb6c2 } // n = 4, score = 1200 // 83c404 | add esp, 4 // 85c0 | test eax, eax // 0f95c2 | setne dl // 0fb6c2 | movzx eax, dl $sequence_27 = { 74?? 8b45f8 85c0 74?? c6040600 } // n = 5, score = 1100 // 74?? | // 8b45f8 | mov eax, dword ptr [ebp - 8] // 85c0 | test eax, eax // 74?? | // c6040600 | mov byte ptr [esi + eax], 0 $sequence_28 = { 83c414 84c0 74?? 0375fc 8d45f4 } // n = 5, score = 1100 // 83c414 | add esp, 0x14 // 84c0 | test al, al // 74?? | // 0375fc | add esi, dword ptr [ebp - 4] // 8d45f4 | lea eax, [ebp - 0xc] $sequence_29 = { 84c0 74?? 8b45f8 85c0 74?? c6040600 } // n = 6, score = 1100 // 84c0 | test al, al // 74?? | // 8b45f8 | mov eax, dword ptr [ebp - 8] // 85c0 | test eax, eax // 74?? | // c6040600 | mov byte ptr [esi + eax], 0 $sequence_30 = { 83c414 84c0 74?? 8b45f8 85c0 } // n = 5, score = 1100 // 83c414 | add esp, 0x14 // 84c0 | test al, al // 74?? | // 8b45f8 | mov eax, dword ptr [ebp - 8] // 85c0 | test eax, eax $sequence_31 = { 84c0 74?? 8b45f8 85c0 74?? c6040600 8bc6 } // n = 7, score = 1100 // 84c0 | test al, al // 74?? | // 8b45f8 | mov eax, dword ptr [ebp - 8] // 85c0 | test eax, eax // 74?? | // c6040600 | mov byte ptr [esi + eax], 0 // 8bc6 | mov eax, esi $sequence_32 = { 5d c3 55 8bec 837d0800 74?? 6800800000 } // n = 7, score = 1000 // 5d | pop ebp // c3 | ret // 55 | push ebp // 8bec | mov ebp, esp // 837d0800 | cmp dword ptr [ebp + 8], 0 // 74?? | // 6800800000 | push 0x8000 $sequence_33 = { 83c40c 6804010000 8d85f8fdffff 50 } // n = 4, score = 1000 // 83c40c | add esp, 0xc // 6804010000 | push 0x104 // 8d85f8fdffff | lea eax, [ebp - 0x208] // 50 | push eax $sequence_34 = { 46 33d2 f7f6 8d0417 5f 5e c3 } // n = 7, score = 900 // 46 | inc esi // 33d2 | xor edx, edx // f7f6 | div esi // 8d0417 | lea eax, [edi + edx] // 5f | pop edi // 5e | pop esi // c3 | ret condition: 7 of them }
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