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rule win_neutrino_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-10-14" version = "1" description = "autogenerated rule brought to you by yara-signator" tool = "yara-signator v0.5.0" tool_config = "callsandjumps;datarefs;binvalue" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.neutrino" malpedia_rule_date = "20201014" malpedia_hash = "a7e3bd57eaf12bf3ea29a863c041091ba3af9ac9" malpedia_version = "20201014" 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 = { 741b e8???????? 85c0 7412 e8???????? 85c0 7409 } // n = 7, score = 1700 // 741b | je 0x1d // e8???????? | // 85c0 | test eax, eax // 7412 | je 0x14 // e8???????? | // 85c0 | test eax, eax // 7409 | je 0xb $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 = { ff15???????? 50 ff15???????? 837dfc00 0f95c0 8be5 } // n = 6, score = 1400 // ff15???????? | // 50 | push eax // ff15???????? | // 837dfc00 | cmp dword ptr [ebp - 4], 0 // 0f95c0 | setne al // 8be5 | mov esp, ebp $sequence_5 = { 0404 0404 010404 0202 } // n = 4, score = 1400 // 0404 | add al, 4 // 0404 | add al, 4 // 010404 | add dword ptr [esp + eax], eax // 0202 | add al, byte ptr [edx] $sequence_6 = { 010404 0202 020402 0404 0404 } // n = 5, score = 1400 // 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_7 = { 6a00 ff15???????? 6880000000 ff15???????? } // n = 4, score = 1400 // 6a00 | push 0 // ff15???????? | // 6880000000 | push 0x80 // ff15???????? | $sequence_8 = { 0404 0404 0404 0404 0404 0402 0202 } // n = 7, score = 1400 // 0404 | add al, 4 // 0404 | add al, 4 // 0404 | add al, 4 // 0404 | add al, 4 // 0404 | add al, 4 // 0402 | add al, 2 // 0202 | add al, byte ptr [edx] $sequence_9 = { 8955fc 8b45fc 0fbe08 85c9 741b } // n = 5, score = 1300 // 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 $sequence_10 = { eb02 eba7 837de800 761f } // n = 4, score = 1300 // eb02 | jmp 4 // eba7 | jmp 0xffffffa9 // 837de800 | cmp dword ptr [ebp - 0x18], 0 // 761f | jbe 0x21 $sequence_11 = { 0fb645e7 50 8b4de0 51 e8???????? } // n = 5, score = 1300 // 0fb645e7 | movzx eax, byte ptr [ebp - 0x19] // 50 | push eax // 8b4de0 | mov ecx, dword ptr [ebp - 0x20] // 51 | push ecx // e8???????? | $sequence_12 = { 85c0 750f 8b4d0c 894dfc 8b55f4 } // n = 5, score = 1300 // 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] $sequence_13 = { 8b4df8 0fbe11 3bc2 740b 8b45fc } // n = 5, score = 1300 // 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] $sequence_14 = { 8b55f8 83c201 8955f8 8b45f8 0fbe08 85c9 7439 } // n = 7, score = 1300 // 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_15 = { 0fb64de7 51 8b55e0 52 e8???????? } // n = 5, score = 1300 // 0fb64de7 | movzx ecx, byte ptr [ebp - 0x19] // 51 | push ecx // 8b55e0 | mov edx, dword ptr [ebp - 0x20] // 52 | push edx // e8???????? | $sequence_16 = { 0fb655e7 52 8b45e0 50 } // n = 4, score = 1300 // 0fb655e7 | movzx edx, byte ptr [ebp - 0x19] // 52 | push edx // 8b45e0 | mov eax, dword ptr [ebp - 0x20] // 50 | push eax $sequence_17 = { 814a1810010000 8b03 894210 83c304 eb13 f645fe20 } // n = 6, score = 1200 // 814a1810010000 | or dword ptr [edx + 0x18], 0x110 // 8b03 | mov eax, dword ptr [ebx] // 894210 | mov dword ptr [edx + 0x10], eax // 83c304 | add ebx, 4 // eb13 | jmp 0x15 // f645fe20 | test byte ptr [ebp - 2], 0x20 $sequence_18 = { 75f4 c3 8b4804 890e ff4808 897004 751e } // n = 7, 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 // 751e | jne 0x20 $sequence_19 = { 807dfd04 c645fc03 0f879a000000 807dfd01 0f8597000000 e9???????? 2d8c000000 } // n = 7, score = 1200 // 807dfd04 | cmp byte ptr [ebp - 3], 4 // c645fc03 | mov byte ptr [ebp - 4], 3 // 0f879a000000 | ja 0xa0 // 807dfd01 | cmp byte ptr [ebp - 3], 1 // 0f8597000000 | jne 0x9d // e9???????? | // 2d8c000000 | sub eax, 0x8c $sequence_20 = { 68???????? ff15???????? 50 68ff000000 } // n = 4, score = 1200 // 68???????? | // ff15???????? | // 50 | push eax // 68ff000000 | push 0xff $sequence_21 = { 8d4de0 51 50 895de0 ff15???????? } // n = 5, score = 1200 // 8d4de0 | lea ecx, [ebp - 0x20] // 51 | push ecx // 50 | push eax // 895de0 | mov dword ptr [ebp - 0x20], ebx // ff15???????? | $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 = { 8bfa 32c0 c645ff00 895dec c645fb00 } // n = 5, score = 1200 // 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_24 = { 7409 8bd0 8b00 85c0 } // n = 4, score = 1200 // 7409 | je 0xb // 8bd0 | mov edx, eax // 8b00 | mov eax, dword ptr [eax] // 85c0 | test eax, eax $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 = { 8901 b301 ff750c e8???????? 59 8ac3 e9???????? } // n = 7, score = 900 // 8901 | mov dword ptr [ecx], eax // b301 | mov bl, 1 // ff750c | push dword ptr [ebp + 0xc] // e8???????? | // 59 | pop ecx // 8ac3 | mov al, bl // e9???????? | $sequence_31 = { c3 6a01 ff15???????? 59 } // n = 4, score = 800 // c3 | ret // 6a01 | push 1 // ff15???????? | // 59 | pop ecx $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 = { 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_34 = { 59 59 85db 7405 83c303 } // n = 5, score = 800 // 59 | pop ecx // 59 | pop ecx // 85db | test ebx, ebx // 7405 | je 7 // 83c303 | add ebx, 3 $sequence_35 = { eb05 68???????? 50 ff510c } // n = 4, score = 800 // eb05 | jmp 7 // 68???????? | // 50 | push eax // ff510c | call dword ptr [ecx + 0xc] $sequence_36 = { 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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