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rule win_coredn_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.coredn" 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 = { 56 8d45fc 8bf1 50 e8???????? 85c0 } // n = 6, score = 600 // 56 | push esi // 8d45fc | lea eax, [ebp - 4] // 8bf1 | mov esi, ecx // 50 | push eax // e8???????? | // 85c0 | test eax, eax $sequence_1 = { 741c 8818 4a 40 83e901 } // n = 5, score = 400 // 741c | je 0x1e // 8818 | mov byte ptr [eax], bl // 4a | dec edx // 40 | inc eax // 83e901 | sub ecx, 1 $sequence_2 = { 0ac8 8b06 880a 42 83f802 7e21 } // n = 6, score = 400 // 0ac8 | or cl, al // 8b06 | mov eax, dword ptr [esi] // 880a | mov byte ptr [edx], cl // 42 | inc edx // 83f802 | cmp eax, 2 // 7e21 | jle 0x23 $sequence_3 = { 41 83ea01 75ea 49 bb7a000780 5f 5e } // n = 7, score = 400 // 41 | inc ecx // 83ea01 | sub edx, 1 // 75ea | jne 0xffffffec // 49 | dec ecx // bb7a000780 | mov ebx, 0x8007007a // 5f | pop edi // 5e | pop esi $sequence_4 = { b87a000780 5e 5d c20400 85d2 750d 8851ff } // n = 7, score = 400 // b87a000780 | mov eax, 0x8007007a // 5e | pop esi // 5d | pop ebp // c20400 | ret 4 // 85d2 | test edx, edx // 750d | jne 0xf // 8851ff | mov byte ptr [ecx - 1], dl $sequence_5 = { bf7a000780 c60000 8bc7 5f 5b } // n = 5, score = 400 // bf7a000780 | mov edi, 0x8007007a // c60000 | mov byte ptr [eax], 0 // 8bc7 | mov eax, edi // 5f | pop edi // 5b | pop ebx $sequence_6 = { 84c0 75f9 2bca 7444 56 8bf3 } // n = 6, score = 400 // 84c0 | test al, al // 75f9 | jne 0xfffffffb // 2bca | sub ecx, edx // 7444 | je 0x46 // 56 | push esi // 8bf3 | mov esi, ebx $sequence_7 = { 5d c20400 c60100 33c0 } // n = 4, score = 400 // 5d | pop ebp // c20400 | ret 4 // c60100 | mov byte ptr [ecx], 0 // 33c0 | xor eax, eax $sequence_8 = { 8b06 33d2 3810 7436 } // n = 4, score = 400 // 8b06 | mov eax, dword ptr [esi] // 33d2 | xor edx, edx // 3810 | cmp byte ptr [eax], dl // 7436 | je 0x38 $sequence_9 = { 8d4320 50 6a40 ff15???????? 8bf0 } // n = 5, score = 400 // 8d4320 | lea eax, [ebx + 0x20] // 50 | push eax // 6a40 | push 0x40 // ff15???????? | // 8bf0 | mov esi, eax $sequence_10 = { 784f 53 56 33db 57 85d2 } // n = 6, score = 400 // 784f | js 0x51 // 53 | push ebx // 56 | push esi // 33db | xor ebx, ebx // 57 | push edi // 85d2 | test edx, edx $sequence_11 = { 83ea01 75e7 8851ff b87a000780 5e } // n = 5, score = 400 // 83ea01 | sub edx, 1 // 75e7 | jne 0xffffffe9 // 8851ff | mov byte ptr [ecx - 1], dl // b87a000780 | mov eax, 0x8007007a // 5e | pop esi $sequence_12 = { 8945fc 85c0 0f842a010000 8b0e } // n = 4, score = 400 // 8945fc | mov dword ptr [ebp - 4], eax // 85c0 | test eax, eax // 0f842a010000 | je 0x130 // 8b0e | mov ecx, dword ptr [esi] $sequence_13 = { 8be5 5d c3 8d043f 50 6a00 } // n = 6, score = 400 // 8be5 | mov esp, ebp // 5d | pop ebp // c3 | ret // 8d043f | lea eax, [edi + edi] // 50 | push eax // 6a00 | push 0 $sequence_14 = { 8b06 880a 42 ff75ec 8b7df0 f7d8 } // n = 6, score = 400 // 8b06 | mov eax, dword ptr [esi] // 880a | mov byte ptr [edx], cl // 42 | inc edx // ff75ec | push dword ptr [ebp - 0x14] // 8b7df0 | mov edi, dword ptr [ebp - 0x10] // f7d8 | neg eax $sequence_15 = { 7f97 891e 8b5df4 8b06 83f801 } // n = 5, score = 400 // 7f97 | jg 0xffffff99 // 891e | mov dword ptr [esi], ebx // 8b5df4 | mov ebx, dword ptr [ebp - 0xc] // 8b06 | mov eax, dword ptr [esi] // 83f801 | cmp eax, 1 $sequence_16 = { 33d2 0f1f440000 3811 7408 41 83e801 } // n = 6, score = 400 // 33d2 | xor edx, edx // 0f1f440000 | nop dword ptr [eax + eax] // 3811 | cmp byte ptr [ecx], dl // 7408 | je 0xa // 41 | inc ecx // 83e801 | sub eax, 1 $sequence_17 = { 85d2 7423 8a1c06 84db 741c } // n = 5, score = 400 // 85d2 | test edx, edx // 7423 | je 0x25 // 8a1c06 | mov bl, byte ptr [esi + eax] // 84db | test bl, bl // 741c | je 0x1e $sequence_18 = { 57 8bfb 83f904 7e70 8bd9 } // n = 5, score = 400 // 57 | push edi // 8bfb | mov edi, ebx // 83f904 | cmp ecx, 4 // 7e70 | jle 0x72 // 8bd9 | mov ebx, ecx $sequence_19 = { 7456 8bcb 8d5101 6690 8a01 41 } // n = 6, score = 400 // 7456 | je 0x58 // 8bcb | mov ecx, ebx // 8d5101 | lea edx, [ecx + 1] // 6690 | nop // 8a01 | mov al, byte ptr [ecx] // 41 | inc ecx $sequence_20 = { 40 83f840 72f2 eb12 8b4e08 } // n = 5, score = 400 // 40 | inc eax // 83f840 | cmp eax, 0x40 // 72f2 | jb 0xfffffff4 // eb12 | jmp 0x14 // 8b4e08 | mov ecx, dword ptr [esi + 8] $sequence_21 = { 83c408 8b4608 85c0 740b 6a01 } // n = 5, score = 400 // 83c408 | add esp, 8 // 8b4608 | mov eax, dword ptr [esi + 8] // 85c0 | test eax, eax // 740b | je 0xd // 6a01 | push 1 $sequence_22 = { 80b8????????3f 7609 8d41ff 8906 85c0 } // n = 5, score = 400 // 80b8????????3f | // 7609 | jbe 0xb // 8d41ff | lea eax, [ecx - 1] // 8906 | mov dword ptr [esi], eax // 85c0 | test eax, eax condition: 7 of them and filesize < 385024 }
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