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rule win_neutrino_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-08-17" version = "1" description = "autogenerated rule brought to you by yara-signator" tool = "yara-signator v0.4.0" tool_config = "callsandjumps;datarefs;binvalue" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.neutrino" malpedia_rule_date = "20200817" malpedia_hash = "8c895fd01eccb47a6225bcb1a3ba53cbb98644c5" malpedia_version = "20200817" 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 = { 741b e8???????? 85c0 7412 e8???????? 85c0 } // n = 6, score = 1700 // 741b | je 0x1d // e8???????? | // 85c0 | test eax, eax // 7412 | je 0x14 // e8???????? | // 85c0 | test eax, eax $sequence_1 = { 50 6a0b 6a07 e8???????? } // n = 4, score = 1500 // 50 | push eax // 6a0b | push 0xb // 6a07 | push 7 // e8???????? | $sequence_2 = { 50 6a05 6a03 e8???????? } // n = 4, score = 1500 // 50 | push eax // 6a05 | push 5 // 6a03 | push 3 // e8???????? | $sequence_3 = { e9???????? 6a01 ff15???????? 85c0 } // n = 4, score = 1400 // e9???????? | // 6a01 | push 1 // ff15???????? | // 85c0 | test eax, eax $sequence_4 = { 0404 0404 0402 0202 0202 } // n = 5, score = 1400 // 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_5 = { 50 ff15???????? 837dfc00 0f95c0 8be5 } // n = 5, score = 1400 // 50 | push eax // ff15???????? | // 837dfc00 | cmp dword ptr [ebp - 4], 0 // 0f95c0 | setne al // 8be5 | mov esp, ebp $sequence_6 = { 0404 010404 0202 020402 } // n = 4, score = 1400 // 0404 | add al, 4 // 010404 | add dword ptr [esp + eax], eax // 0202 | add al, byte ptr [edx] // 020402 | add al, byte ptr [edx + eax] $sequence_7 = { 020402 0404 0404 0404 0404 0404 0403 } // n = 7, score = 1400 // 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 = { 6a00 ff15???????? 6880000000 ff15???????? } // n = 4, score = 1400 // 6a00 | push 0 // ff15???????? | // 6880000000 | push 0x80 // ff15???????? | $sequence_9 = { 8b45ac 50 ff15???????? 8945d0 } // n = 4, score = 1300 // 8b45ac | mov eax, dword ptr [ebp - 0x54] // 50 | push eax // ff15???????? | // 8945d0 | mov dword ptr [ebp - 0x30], eax $sequence_10 = { 52 8b45dc 50 6a00 6a00 ff15???????? } // n = 6, score = 1300 // 52 | push edx // 8b45dc | mov eax, dword ptr [ebp - 0x24] // 50 | push eax // 6a00 | push 0 // 6a00 | push 0 // ff15???????? | $sequence_11 = { 0fb6550c 83fa01 7509 8b4508 83c001 894508 8b4dfc } // n = 7, score = 1300 // 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_12 = { 7439 8b550c 8955fc 8b45fc } // n = 4, score = 1300 // 7439 | je 0x3b // 8b550c | mov edx, dword ptr [ebp + 0xc] // 8955fc | mov dword ptr [ebp - 4], edx // 8b45fc | mov eax, dword ptr [ebp - 4] $sequence_13 = { 8945f4 8b4d0c 894dfc 8b55f4 0fbe02 85c0 } // n = 6, score = 1300 // 8945f4 | mov dword ptr [ebp - 0xc], eax // 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 $sequence_14 = { 0fb655e7 52 8b45e0 50 e8???????? } // n = 5, score = 1300 // 0fb655e7 | movzx edx, byte ptr [ebp - 0x19] // 52 | push edx // 8b45e0 | mov eax, dword ptr [ebp - 0x20] // 50 | push eax // e8???????? | $sequence_15 = { 3bc2 740b 8b45fc 83c001 8945fc ebdb } // n = 6, score = 1300 // 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 // ebdb | jmp 0xffffffdd $sequence_16 = { 0fb6d0 83fa01 7531 8b45fc 83c001 } // n = 5, score = 1300 // 0fb6d0 | movzx edx, al // 83fa01 | cmp edx, 1 // 7531 | jne 0x33 // 8b45fc | mov eax, dword ptr [ebp - 4] // 83c001 | add eax, 1 $sequence_17 = { 807dfd01 0f8597000000 e9???????? 2d8c000000 } // n = 4, score = 1200 // 807dfd01 | cmp byte ptr [ebp - 3], 1 // 0f8597000000 | jne 0x9d // e9???????? | // 2d8c000000 | sub eax, 0x8c $sequence_18 = { 668b03 66894210 83c302 f645fe02 740a 834a1804 } // n = 6, score = 1200 // 668b03 | mov ax, word ptr [ebx] // 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 $sequence_19 = { 68???????? ff15???????? 50 68ff000000 } // n = 4, score = 1200 // 68???????? | // ff15???????? | // 50 | push eax // 68ff000000 | push 0xff $sequence_20 = { 83c304 eb13 f645fe20 740d 814a1804010000 8a03 } // n = 6, score = 1200 // 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 = { 3bc1 7409 8bd0 8b00 85c0 } // n = 5, score = 1200 // 3bc1 | cmp eax, ecx // 7409 | je 0xb // 8bd0 | mov edx, eax // 8b00 | mov eax, dword ptr [eax] // 85c0 | test eax, eax $sequence_22 = { f3aa c645f810 56 8b45f4 8a00 ff45f4 0fb6f0 } // n = 7, score = 1200 // f3aa | rep stosb byte ptr es:[edi], al // c645f810 | mov byte ptr [ebp - 8], 0x10 // 56 | push esi // 8b45f4 | mov eax, dword ptr [ebp - 0xc] // 8a00 | mov al, byte ptr [eax] // ff45f4 | inc dword ptr [ebp - 0xc] // 0fb6f0 | movzx esi, al $sequence_23 = { 75f4 c3 8b4804 890e ff4808 897004 } // n = 6, score = 1200 // 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 $sequence_24 = { 8b3b 0fb6f2 6a05 58 2bc6 8d1437 } // n = 6, score = 1200 // 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_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 = { 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_27 = { 83c404 85c0 0f95c2 0fb6c2 } // n = 4, score = 1100 // 83c404 | add esp, 4 // 85c0 | test eax, eax // 0f95c2 | setne dl // 0fb6c2 | movzx eax, dl $sequence_28 = { e8???????? 83c410 680c020000 e8???????? } // n = 4, score = 1000 // e8???????? | // 83c410 | add esp, 0x10 // 680c020000 | push 0x20c // e8???????? | $sequence_29 = { 83c40c 6804010000 8d85f8fdffff 50 } // n = 4, score = 900 // 83c40c | add esp, 0xc // 6804010000 | push 0x104 // 8d85f8fdffff | lea eax, [ebp - 0x208] // 50 | push eax $sequence_30 = { 740f 8b45f8 85c0 7408 c6040600 } // n = 5, score = 900 // 740f | je 0x11 // 8b45f8 | mov eax, dword ptr [ebp - 8] // 85c0 | test eax, eax // 7408 | je 0xa // c6040600 | mov byte ptr [esi + eax], 0 $sequence_31 = { 59 85db 7405 83c303 } // n = 4, score = 800 // 59 | pop ecx // 85db | test ebx, ebx // 7405 | je 7 // 83c303 | add ebx, 3 $sequence_32 = { 5b c9 c3 83c004 74ed 8b4d0c } // n = 6, score = 800 // 5b | pop ebx // c9 | leave // c3 | ret // 83c004 | add eax, 4 // 74ed | je 0xffffffef // 8b4d0c | mov ecx, dword ptr [ebp + 0xc] $sequence_33 = { 68???????? 50 ff15???????? f7d8 1bc0 40 c3 } // n = 7, score = 800 // 68???????? | // 50 | push eax // ff15???????? | // f7d8 | neg eax // 1bc0 | sbb eax, eax // 40 | inc eax // c3 | ret $sequence_34 = { c3 6a01 ff15???????? 59 } // n = 4, score = 800 // c3 | ret // 6a01 | push 1 // ff15???????? | // 59 | pop ecx $sequence_35 = { 8bc6 2bc3 50 53 ff75fc } // n = 5, score = 800 // 8bc6 | mov eax, esi // 2bc3 | sub eax, ebx // 50 | push eax // 53 | push ebx // ff75fc | push dword ptr [ebp - 4] $sequence_36 = { be???????? ff15???????? 57 8906 } // n = 4, score = 800 // be???????? | // ff15???????? | // 57 | push edi // 8906 | mov dword ptr [esi], eax condition: 7 of them and filesize < 507904 }
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