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rule win_neutrino_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-12-22" version = "1" description = "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 = "20201222" malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130" malpedia_version = "20201023" 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 = { 85c0 741b e8???????? 85c0 7412 e8???????? 85c0 } // n = 7, score = 1800 // 85c0 | test eax, eax // 741b | je 0x1d // e8???????? | // 85c0 | test eax, eax // 7412 | je 0x14 // e8???????? | // 85c0 | test eax, eax $sequence_2 = { 50 6a05 6a03 e8???????? } // n = 4, score = 1600 // 50 | push eax // 6a05 | push 5 // 6a03 | push 3 // e8???????? | $sequence_3 = { 50 6a0b 6a07 e8???????? } // n = 4, score = 1600 // 50 | push eax // 6a0b | push 0xb // 6a07 | push 7 // e8???????? | $sequence_4 = { 0404 0404 0404 0404 0404 0402 0202 } // n = 7, score = 1500 // 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_5 = { 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_6 = { 837d0800 7408 8b4508 a3???????? 8b0d???????? 894df8 } // n = 6, score = 1500 // 837d0800 | cmp dword ptr [ebp + 8], 0 // 7408 | je 0xa // 8b4508 | mov eax, dword ptr [ebp + 8] // a3???????? | // 8b0d???????? | // 894df8 | mov dword ptr [ebp - 8], ecx $sequence_7 = { 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_8 = { 6a00 ff15???????? 6880000000 ff15???????? } // n = 4, score = 1500 // 6a00 | push 0 // ff15???????? | // 6880000000 | push 0x80 // ff15???????? | $sequence_9 = { 83fa01 7531 8b45fc 83c001 8945fc 8b4d08 } // n = 6, score = 1500 // 83fa01 | cmp edx, 1 // 7531 | jne 0x33 // 8b45fc | mov eax, dword ptr [ebp - 4] // 83c001 | add eax, 1 // 8945fc | mov dword ptr [ebp - 4], eax // 8b4d08 | mov ecx, dword ptr [ebp + 8] $sequence_10 = { 8b5508 52 ff15???????? 83f8ff 7504 } // n = 5, score = 1500 // 8b5508 | mov edx, dword ptr [ebp + 8] // 52 | push edx // ff15???????? | // 83f8ff | cmp eax, -1 // 7504 | jne 6 $sequence_11 = { 8b4df4 0fbe11 8b45fc 0fbe08 3bd1 7513 8b55f4 } // n = 7, score = 1500 // 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] // 3bd1 | cmp edx, ecx // 7513 | jne 0x15 // 8b55f4 | mov edx, dword ptr [ebp - 0xc] $sequence_12 = { 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_13 = { e9???????? 6a01 ff15???????? 85c0 } // n = 4, score = 1500 // e9???????? | // 6a01 | push 1 // ff15???????? | // 85c0 | test eax, eax $sequence_14 = { 680c030000 e8???????? 83c404 8945f8 } // n = 4, score = 1500 // 680c030000 | push 0x30c // e8???????? | // 83c404 | add esp, 4 // 8945f8 | mov dword ptr [ebp - 8], eax $sequence_15 = { 0fbe11 3bc2 740b 8b45fc 83c001 } // n = 5, score = 1500 // 0fbe11 | movsx edx, byte ptr [ecx] // 3bc2 | cmp eax, edx // 740b | je 0xd // 8b45fc | mov eax, dword ptr [ebp - 4] // 83c001 | add eax, 1 $sequence_16 = { ebdb 8b4dfc 0fbe11 85d2 7502 eb02 ebb4 } // n = 7, score = 1500 // ebdb | jmp 0xffffffdd // 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 $sequence_17 = { 8b55fc 0fbe02 85c0 750f } // n = 4, score = 1500 // 8b55fc | mov edx, dword ptr [ebp - 4] // 0fbe02 | movsx eax, byte ptr [edx] // 85c0 | test eax, eax // 750f | jne 0x11 $sequence_18 = { 807df900 8b45f0 743f 83e820 741d 48 7406 } // n = 7, score = 1300 // 807df900 | cmp byte ptr [ebp - 7], 0 // 8b45f0 | mov eax, dword ptr [ebp - 0x10] // 743f | je 0x41 // 83e820 | sub eax, 0x20 // 741d | je 0x1f // 48 | dec eax // 7406 | je 8 $sequence_19 = { 7521 6800020000 51 ff35???????? c7460480000000 ff15???????? } // n = 6, score = 1300 // 7521 | jne 0x23 // 6800020000 | push 0x200 // 51 | push ecx // ff35???????? | // c7460480000000 | mov dword ptr [esi + 4], 0x80 // ff15???????? | $sequence_20 = { 7407 42 3bd1 72ec } // n = 4, score = 1300 // 7407 | je 9 // 42 | inc edx // 3bd1 | cmp edx, ecx // 72ec | jb 0xffffffee $sequence_21 = { 7417 48 753c 807dfd04 c645fc03 } // n = 5, score = 1300 // 7417 | je 0x19 // 48 | dec eax // 753c | jne 0x3e // 807dfd04 | cmp byte ptr [ebp - 3], 4 // c645fc03 | mov byte ptr [ebp - 4], 3 $sequence_22 = { 6800800000 6a00 50 ff15???????? c3 } // n = 5, score = 1300 // 6800800000 | push 0x8000 // 6a00 | push 0 // 50 | push eax // ff15???????? | // c3 | ret $sequence_23 = { f645fe40 7420 f645ff08 0f8485000000 814a1808010000 668b03 } // n = 6, 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] $sequence_24 = { 85c0 75f4 c3 8b4804 890e ff4808 } // n = 6, score = 1300 // 85c0 | test eax, eax // 75f4 | jne 0xfffffff6 // c3 | ret // 8b4804 | mov ecx, dword ptr [eax + 4] // 890e | mov dword ptr [esi], ecx // ff4808 | dec dword ptr [eax + 8] $sequence_25 = { 7409 8bd0 8b00 85c0 75f4 c3 } // n = 6, score = 1300 // 7409 | je 0xb // 8bd0 | mov edx, eax // 8b00 | mov eax, dword ptr [eax] // 85c0 | test eax, eax // 75f4 | jne 0xfffffff6 // c3 | ret $sequence_26 = { 83c404 85c0 0f95c2 0fb6c2 50 } // n = 5, score = 1200 // 83c404 | add esp, 4 // 85c0 | test eax, eax // 0f95c2 | setne dl // 0fb6c2 | movzx eax, dl // 50 | push eax $sequence_27 = { 68???????? ff15???????? 50 68ff000000 } // n = 4, score = 1200 // 68???????? | // ff15???????? | // 50 | push eax // 68ff000000 | push 0xff $sequence_28 = { 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_29 = { 8d85b8feffff 50 68???????? ff15???????? } // n = 4, score = 1100 // 8d85b8feffff | lea eax, [ebp - 0x148] // 50 | push eax // 68???????? | // ff15???????? | $sequence_30 = { 83c40c 6804010000 8d85f8fdffff 50 } // n = 4, score = 1000 // 83c40c | add esp, 0xc // 6804010000 | push 0x104 // 8d85f8fdffff | lea eax, [ebp - 0x208] // 50 | push eax $sequence_31 = { e8???????? 83c410 680c020000 e8???????? } // n = 4, score = 1000 // e8???????? | // 83c410 | add esp, 0x10 // 680c020000 | push 0x20c // e8???????? | $sequence_32 = { 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_33 = { 7412 68???????? 50 ff15???????? f7d8 1bc0 40 } // n = 7, score = 800 // 7412 | je 0x14 // 68???????? | // 50 | push eax // ff15???????? | // f7d8 | neg eax // 1bc0 | sbb eax, eax // 40 | inc eax $sequence_34 = { c9 c3 83c004 74ed 8b4d0c } // n = 5, score = 800 // c9 | leave // c3 | ret // 83c004 | add eax, 4 // 74ed | je 0xffffffef // 8b4d0c | mov ecx, dword ptr [ebp + 0xc] $sequence_35 = { 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_36 = { c3 6a01 ff15???????? 59 } // n = 4, score = 800 // c3 | ret // 6a01 | push 1 // ff15???????? | // 59 | pop ecx condition: 7 of them and filesize < 507904 }
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