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rule win_coredn_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2021-06-10" version = "1" description = "Detects win.coredn." info = "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 = "20210604" malpedia_hash = "be09d5d71e77373c0f538068be31a2ad4c69cfbd" malpedia_version = "20210616" 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, dword ptr [ebp - 4] // 8bf1 | mov esi, ecx // 50 | push eax // e8???????? | // 85c0 | test eax, eax $sequence_1 = { 8d0416 85c0 7420 8a040f 84c0 7419 8801 } // n = 7, score = 400 // 8d0416 | lea eax, dword ptr [esi + edx] // 85c0 | test eax, eax // 7420 | je 0x22 // 8a040f | mov al, byte ptr [edi + ecx] // 84c0 | test al, al // 7419 | je 0x1b // 8801 | mov byte ptr [ecx], al $sequence_2 = { 50 e8???????? 83c408 53 8bce } // n = 5, score = 400 // 50 | push eax // e8???????? | // 83c408 | add esp, 8 // 53 | push ebx // 8bce | mov ecx, esi $sequence_3 = { ba02000000 57 8d7920 33c9 8bc7 } // n = 5, score = 400 // ba02000000 | mov edx, 2 // 57 | push edi // 8d7920 | lea edi, dword ptr [ecx + 0x20] // 33c9 | xor ecx, ecx // 8bc7 | mov eax, edi $sequence_4 = { 41 84c0 75f9 2bca 7444 } // n = 5, score = 400 // 41 | inc ecx // 84c0 | test al, al // 75f9 | jne 0xfffffffb // 2bca | sub ecx, edx // 7444 | je 0x46 $sequence_5 = { 7506 48 bf7a000780 c60000 8bc7 5f 5b } // n = 7, score = 400 // 7506 | jne 8 // 48 | dec eax // bf7a000780 | mov edi, 0x8007007a // c60000 | mov byte ptr [eax], 0 // 8bc7 | mov eax, edi // 5f | pop edi // 5b | pop ebx $sequence_6 = { 83ec14 53 56 8bf2 8bd9 895df4 8b06 } // n = 7, score = 400 // 83ec14 | sub esp, 0x14 // 53 | push ebx // 56 | push esi // 8bf2 | mov esi, edx // 8bd9 | mov ebx, ecx // 895df4 | mov dword ptr [ebp - 0xc], ebx // 8b06 | mov eax, dword ptr [esi] $sequence_7 = { ff75fc 53 e8???????? ff75fc c6041f00 e8???????? 83c41c } // n = 7, score = 400 // ff75fc | push dword ptr [ebp - 4] // 53 | push ebx // e8???????? | // ff75fc | push dword ptr [ebp - 4] // c6041f00 | mov byte ptr [edi + ebx], 0 // e8???????? | // 83c41c | add esp, 0x1c $sequence_8 = { 5d c20400 85d2 750d 8851ff b87a000780 5e } // n = 7, score = 400 // 5d | pop ebp // c20400 | ret 4 // 85d2 | test edx, edx // 750d | jne 0xf // 8851ff | mov byte ptr [ecx - 1], dl // b87a000780 | mov eax, 0x8007007a // 5e | pop esi $sequence_9 = { 42 ff75ec 8b7df0 f7d8 83e003 c60200 } // n = 6, score = 400 // 42 | inc edx // ff75ec | push dword ptr [ebp - 0x14] // 8b7df0 | mov edi, dword ptr [ebp - 0x10] // f7d8 | neg eax // 83e003 | and eax, 3 // c60200 | mov byte ptr [edx], 0 $sequence_10 = { 0f847c010000 85c0 0f8474010000 7823 66660f1f840000000000 8b0e 0fbe4419ff } // n = 7, score = 400 // 0f847c010000 | je 0x182 // 85c0 | test eax, eax // 0f8474010000 | je 0x17a // 7823 | js 0x25 // 66660f1f840000000000 | nop word ptr [eax + eax] // 8b0e | mov ecx, dword ptr [esi] // 0fbe4419ff | movsx eax, byte ptr [ecx + ebx - 1] $sequence_11 = { 53 2bf8 e8???????? 57 ff75fc 53 } // n = 6, score = 400 // 53 | push ebx // 2bf8 | sub edi, eax // e8???????? | // 57 | push edi // ff75fc | push dword ptr [ebp - 4] // 53 | push ebx $sequence_12 = { 5e 5d c20400 c60100 33c0 } // n = 5, score = 400 // 5e | pop esi // 5d | pop ebp // c20400 | ret 4 // c60100 | mov byte ptr [ecx], 0 // 33c0 | xor eax, eax $sequence_13 = { 8808 8bc7 5f 5b 5e 8be5 5d } // n = 7, score = 400 // 8808 | mov byte ptr [eax], cl // 8bc7 | mov eax, edi // 5f | pop edi // 5b | pop ebx // 5e | pop esi // 8be5 | mov esp, ebp // 5d | pop ebp $sequence_14 = { 6a00 50 e8???????? 8b4e08 8d5701 83c40c ff36 } // n = 7, score = 400 // 6a00 | push 0 // 50 | push eax // e8???????? | // 8b4e08 | mov ecx, dword ptr [esi + 8] // 8d5701 | lea edx, dword ptr [edi + 1] // 83c40c | add esp, 0xc // ff36 | push dword ptr [esi] $sequence_15 = { 8945fc 85c0 0f842a010000 8b0e 8bd0 57 8bfb } // n = 7, score = 400 // 8945fc | mov dword ptr [ebp - 4], eax // 85c0 | test eax, eax // 0f842a010000 | je 0x130 // 8b0e | mov ecx, dword ptr [esi] // 8bd0 | mov edx, eax // 57 | push edi // 8bfb | mov edi, ebx $sequence_16 = { 84db 741c 8818 4a 40 83e901 } // n = 6, score = 400 // 84db | test bl, bl // 741c | je 0x1e // 8818 | mov byte ptr [eax], bl // 4a | dec edx // 40 | inc eax // 83e901 | sub ecx, 1 $sequence_17 = { 57 85d2 7438 8b7d08 befeffff7f 2bf2 } // n = 6, score = 400 // 57 | push edi // 85d2 | test edx, edx // 7438 | je 0x3a // 8b7d08 | mov edi, dword ptr [ebp + 8] // befeffff7f | mov esi, 0x7ffffffe // 2bf2 | sub esi, edx $sequence_18 = { 03d1 2bf0 85d2 7423 8a1c06 84db } // n = 6, score = 400 // 03d1 | add edx, ecx // 2bf0 | sub esi, eax // 85d2 | test edx, edx // 7423 | je 0x25 // 8a1c06 | mov bl, byte ptr [esi + eax] // 84db | test bl, bl $sequence_19 = { 8bd0 57 8bfb 83f904 7e70 8bd9 } // n = 6, score = 400 // 8bd0 | mov edx, eax // 57 | push edi // 8bfb | mov edi, ebx // 83f904 | cmp ecx, 4 // 7e70 | jle 0x72 // 8bd9 | mov ebx, ecx $sequence_20 = { 8b06 880a 42 83f802 7e21 0fb64702 } // n = 6, score = 400 // 8b06 | mov eax, dword ptr [esi] // 880a | mov byte ptr [edx], cl // 42 | inc edx // 83f802 | cmp eax, 2 // 7e21 | jle 0x23 // 0fb64702 | movzx eax, byte ptr [edi + 2] $sequence_21 = { 8bec 56 8b7508 ba04010000 2bf1 } // n = 5, score = 400 // 8bec | mov ebp, esp // 56 | push esi // 8b7508 | mov esi, dword ptr [ebp + 8] // ba04010000 | mov edx, 0x104 // 2bf1 | sub esi, ecx $sequence_22 = { 8b06 42 803c0200 75ca 8b4608 } // n = 5, score = 400 // 8b06 | mov eax, dword ptr [esi] // 42 | inc edx // 803c0200 | cmp byte ptr [edx + eax], 0 // 75ca | jne 0xffffffcc // 8b4608 | mov eax, dword ptr [esi + 8] condition: 7 of them and filesize < 385024 }
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