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rule win_microcin_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-05-30" 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.microcin" malpedia_rule_date = "20200529" malpedia_hash = "92c362319514e5a6da26204961446caa3a8b32a8" malpedia_version = "20200529" 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 = { 6804010000 50 ff15???????? 8d85f8feffff 50 } // n = 5, score = 400 // 6804010000 | push 0x104 // 50 | push eax // ff15???????? | // 8d85f8feffff | lea eax, [ebp - 0x108] // 50 | push eax $sequence_1 = { ff15???????? 8b3d???????? 8d85e0feffff 50 } // n = 4, score = 400 // ff15???????? | // 8b3d???????? | // 8d85e0feffff | lea eax, [ebp - 0x120] // 50 | push eax $sequence_2 = { 8b1d???????? 8d85a8feffff 50 ffd3 } // n = 4, score = 400 // 8b1d???????? | // 8d85a8feffff | lea eax, [ebp - 0x158] // 50 | push eax // ffd3 | call ebx $sequence_3 = { 56 ff15???????? 85c0 0f45f7 } // n = 4, score = 400 // 56 | push esi // ff15???????? | // 85c0 | test eax, eax // 0f45f7 | cmovne esi, edi $sequence_4 = { 85c0 7e18 80bc35a8feffff3a 741f 8d85a8feffff } // n = 5, score = 400 // // 7e18 | jle 0x1a // 80bc35a8feffff3a | cmp byte ptr [ebp + esi - 0x158], 0x3a // 741f | je 0x21 // 8d85a8feffff | lea eax, [ebp - 0x158] $sequence_5 = { ff15???????? 85c0 7426 8b400c } // n = 4, score = 400 // ff15???????? | // 85c0 | test eax, eax // 7426 | je 0x28 // 8b400c | mov eax, dword ptr [eax + 0xc] $sequence_6 = { ff75d4 e8???????? 83c40c 8bc7 } // n = 4, score = 400 // ff75d4 | push dword ptr [ebp - 0x2c] // e8???????? | // 83c40c | add esp, 0xc // 8bc7 | mov eax, edi $sequence_7 = { 68ffff0000 56 8b35???????? ffd6 } // n = 4, score = 400 // 68ffff0000 | push 0xffff // 56 | push esi // 8b35???????? | // ffd6 | call esi $sequence_8 = { 488d442430 448bcb 4c8bc7 4889442420 ff15???????? 4c89642440 } // n = 6, score = 200 // 488d442430 | dec eax // 448bcb | mov ecx, eax // 4c8bc7 | test al, al // 4889442420 | dec eax // ff15???????? | // 4c89642440 | lea eax, [esp + 0x30] $sequence_9 = { eb03 498bc4 488d158dbf0000 488bc8 e8???????? 84c0 } // n = 6, score = 200 // eb03 | jmp 5 // 498bc4 | dec ecx // 488d158dbf0000 | mov eax, esp // 488bc8 | dec eax // e8???????? | // 84c0 | lea edx, [0xbf8d] $sequence_10 = { 33c0 488b8d50040000 4833cc e8???????? 4881c460050000 5d c3 } // n = 7, score = 200 // 33c0 | inc esp // 488b8d50040000 | mov ecx, ebx // 4833cc | dec esp // e8???????? | // 4881c460050000 | mov eax, edi // 5d | dec eax // c3 | mov dword ptr [esp + 0x20], eax $sequence_11 = { 41bc14030000 4c8d0574130100 488bcd 418bd4 e8???????? 33c9 85c0 } // n = 7, score = 200 // 41bc14030000 | inc ecx // 4c8d0574130100 | mov eax, 0x12010 // 488bcd | dec eax // 418bd4 | mov ecx, ebp // e8???????? | // 33c9 | int3 // 85c0 | dec esp $sequence_12 = { 6828010000 8d85ccfeffff 6a00 50 } // n = 4, score = 200 // 6828010000 | mov eax, dword ptr [ebp - 0x1c] // 8d85ccfeffff | mov eax, dword ptr [eax] // 6a00 | push eax // 50 | mov ecx, dword ptr [ebp - 8] $sequence_13 = { 0fb602 83e801 8b4d0c 8801 eb0e 8b550c } // n = 6, score = 200 // 0fb602 | movzx eax, byte ptr [edx] // 83e801 | sub eax, 1 // 8b4d0c | mov ecx, dword ptr [ebp + 0xc] // 8801 | mov byte ptr [ecx], al // eb0e | jmp 0x10 // 8b550c | mov edx, dword ptr [ebp + 0xc] $sequence_14 = { 418d5001 e9???????? 4053 4883ec20 8bd9 e8???????? 8bcb } // n = 7, score = 200 // 418d5001 | jb 3 // e9???????? | // 4053 | pop esi // 4883ec20 | ret // 8bd9 | lea eax, [ebp - 0x158] // e8???????? | // 8bcb | push eax $sequence_15 = { 744c 8b55f8 6bd268 035510 8b45fc } // n = 5, score = 200 // 744c | je 0x4e // 8b55f8 | mov edx, dword ptr [ebp - 8] // 6bd268 | imul edx, edx, 0x68 // 035510 | add edx, dword ptr [ebp + 0x10] // 8b45fc | mov eax, dword ptr [ebp - 4] $sequence_16 = { 837df808 7d21 6a00 6a00 } // n = 4, score = 200 // 837df808 | cmp dword ptr [ebp - 8], 8 // 7d21 | jge 0x23 // 6a00 | push 0 // 6a00 | push 0 $sequence_17 = { 488d4c2471 458bc6 33d2 885c2470 e8???????? 418d5601 488d4c2470 } // n = 7, score = 200 // 488d4c2471 | mov ecx, dword ptr [ebp + 0x450] // 458bc6 | dec eax // 33d2 | xor ecx, esp // 885c2470 | dec eax // e8???????? | // 418d5601 | add esp, 0x560 // 488d4c2470 | pop ebp $sequence_18 = { 6e 7669 726f 6e 6d 656e 7400 } // n = 7, score = 200 // 6e | mov edx, dword ptr [ecx + 0x28] // 7669 | push edx // 726f | cmp dword ptr [ebp - 8], 8 // 6e | jge 0x5c // 6d | push 0 // 656e | push 0 // 7400 | je 0x8d $sequence_19 = { 488b4587 498986a8000000 8b442420 418986b0000000 } // n = 4, score = 200 // 488b4587 | dec esp // 498986a8000000 | mov dword ptr [esp + 0x40], esp // 8b442420 | xor eax, eax // 418986b0000000 | dec eax $sequence_20 = { 488bf9 448d4250 488bcb e8???????? 488364244000 814f5812020000 } // n = 6, score = 200 // 488bf9 | ret // 448d4250 | dec eax // 488bcb | mov eax, dword ptr [ebp - 0x79] // e8???????? | // 488364244000 | dec ecx // 814f5812020000 | mov dword ptr [esi + 0xa8], eax $sequence_21 = { 636373 7673 6873742e65 7865 } // n = 4, score = 200 // 636373 | jbe 0x8b // 7673 | jb 0x93 // 6873742e65 | outsb dx, byte ptr [esi] // 7865 | insd dword ptr es:[edi], dx $sequence_22 = { 7422 03d8 3bdf 741c } // n = 4, score = 200 // 7422 | mov eax, dword ptr [esp + 0x20] // 03d8 | inc ecx // 3bdf | mov dword ptr [esi + 0xb0], eax // 741c | dec eax $sequence_23 = { 751a 488d15f8110100 41b810200100 488bcd } // n = 4, score = 200 // 751a | pop ebp // 488d15f8110100 | adc eax, 0x15151515 // 41b810200100 | adc eax, 0x15151515 // 488bcd | adc eax, 0x11101515 $sequence_24 = { e8???????? 68204e0000 8b55ec 52 } // n = 4, score = 200 // e8???????? | // 68204e0000 | push 0x4e20 // 8b55ec | mov edx, dword ptr [ebp - 0x14] // 52 | push edx $sequence_25 = { 7419 488d15730c0100 488bc8 ff15???????? } // n = 4, score = 200 // 7419 | xor ecx, ebp // 488d15730c0100 | mov eax, 1 // 488bc8 | mov esp, ebp // ff15???????? | $sequence_26 = { 817de4f4604000 7311 8b45e4 8b00 } // n = 4, score = 200 // 817de4f4604000 | cmp dword ptr [ebp - 0x1c], 0x4060f4 // 7311 | jae 0x13 // 8b45e4 | mov eax, dword ptr [ebp - 0x1c] // 8b00 | mov eax, dword ptr [eax] $sequence_27 = { 55 8bec b88c200000 e8???????? 56 } // n = 5, score = 200 // 55 | push ebp // 8bec | mov ebp, esp // b88c200000 | mov eax, 0x208c // e8???????? | // 56 | push esi $sequence_28 = { 4883ec20 8bd9 488d0d950c0100 ff15???????? } // n = 4, score = 200 // 4883ec20 | jne 0x1f // 8bd9 | dec eax // 488d0d950c0100 | lea edx, [0x111f8] // ff15???????? | $sequence_29 = { 4c8d05b7120100 41b903000000 488d4c45bc 488bc1 492bc5 48d1f8 482bf8 } // n = 7, score = 200 // 4c8d05b7120100 | lea eax, [0x1126c] // 41b903000000 | dec ecx // 488d4c45bc | mov edx, esp // 488bc1 | dec eax // 492bc5 | mov ecx, ebp // 48d1f8 | test eax, eax // 482bf8 | inc ecx $sequence_30 = { 8b4514 895004 c745f01a000000 8b4d14 51 8d55f0 52 } // n = 7, score = 200 // 8b4514 | mov eax, dword ptr [ebp + 0x14] // 895004 | mov dword ptr [eax + 4], edx // c745f01a000000 | mov dword ptr [ebp - 0x10], 0x1a // 8b4d14 | mov ecx, dword ptr [ebp + 0x14] // 51 | push ecx // 8d55f0 | lea edx, [ebp - 0x10] // 52 | push edx $sequence_31 = { e8???????? cc 4c8d056c120100 498bd4 488bcd e8???????? 85c0 } // n = 7, score = 200 // e8???????? | // cc | adc eax, 0x15151515 // 4c8d056c120100 | adc eax, 0x15151515 // 498bd4 | mov dword ptr [esi + 0x40da38], eax // 488bcd | add esi, 4 // e8???????? | // 85c0 | cmp esi, 0x28 $sequence_32 = { fa fa fa fa fa fa } // n = 6, score = 200 // fa | lea eax, [ebp - 0x134] // fa | push 0 // fa | push eax // fa | outsb dx, byte ptr [esi] // fa | jbe 0x75 // fa | jb 0x7d $sequence_33 = { ff15???????? 488d155fda0000 488bcb 483305???????? 488905???????? ff15???????? 488d1549da0000 } // n = 7, score = 200 // ff15???????? | // 488d155fda0000 | lea ecx, [esp + 0x71] // 488bcb | inc ebp // 483305???????? | // 488905???????? | // ff15???????? | // 488d1549da0000 | mov eax, esi $sequence_34 = { 4c8d0502130100 8bd7 498bcd e8???????? 85c0 7415 4533c9 } // n = 7, score = 200 // 4c8d0502130100 | lea edx, [eax + 1] // 8bd7 | inc eax // 498bcd | push ebx // e8???????? | // 85c0 | dec eax // 7415 | sub esp, 0x20 // 4533c9 | mov ebx, ecx $sequence_35 = { 50 68???????? 8b4df8 8b5128 52 } // n = 5, score = 200 // 50 | push eax // 68???????? | // 8b4df8 | mov ecx, dword ptr [ebp - 8] // 8b5128 | mov edx, dword ptr [ecx + 0x28] // 52 | push edx $sequence_36 = { 49 53 53 56 43 } // n = 5, score = 200 // 49 | mov ecx, dword ptr [eax + 4] // 53 | call ecx // 53 | add esp, 0x14 // 56 | mov ecx, dword ptr [ebp - 8] // 43 | push 0x128 $sequence_37 = { 7370 696465726167656e 742e 657865 } // n = 4, score = 200 // 7370 | push esi // 696465726167656e | inc ebx // 742e | cli // 657865 | cli $sequence_38 = { 7513 395708 750e 39570c 7509 395704 } // n = 6, score = 100 // 7513 | insd dword ptr es:[edi], dx // 395708 | dec ecx // 750e | push ebx // 39570c | push ebx // 7509 | push esi // 395704 | inc ebp $sequence_39 = { 5f 5e 5b 33cc c705????????00000000 b801000000 e8???????? } // n = 7, score = 100 // 5f | cli // 5e | cli // 5b | jb 0x71 // 33cc | outsb dx, byte ptr [esi] // c705????????00000000 | // b801000000 | insd dword ptr es:[edi], dx // e8???????? | $sequence_40 = { 41 ffd5 4c 89f9 48 } // n = 5, score = 100 // 41 | insd dword ptr es:[edi], dx // ffd5 | outsb dx, byte ptr gs:[esi] // 4c | je 0xa // 89f9 | inc ebp // 48 | outsb dx, byte ptr [esi] $sequence_41 = { 7309 8b04c5c09b4000 5d c3 33c0 5d c3 } // n = 7, score = 100 // 7309 | jne 0x15 // 8b04c5c09b4000 | cmp dword ptr [edi + 8], edx // 5d | jne 0x13 // c3 | cmp dword ptr [edi + 0xc], edx // 33c0 | jne 0x13 // 5d | cmp dword ptr [edi + 4], edx // c3 | pop edx $sequence_42 = { ff15???????? 8b4dfc 33cd b801000000 e8???????? 8be5 5d } // n = 7, score = 100 // ff15???????? | // 8b4dfc | add edx, ebx // 33cd | push 0x128 // b801000000 | lea eax, [ebp - 0x134] // e8???????? | // 8be5 | push 0 // 5d | push eax $sequence_43 = { 50 ff760c ff7508 ff7604 ff7644 e8???????? } // n = 6, score = 100 // 50 | inc ebp // ff760c | outsb dx, byte ptr [esi] // ff7508 | jbe 0x6d // ff7604 | jb 0x75 // ff7644 | outsb dx, byte ptr [esi] // e8???????? | $sequence_44 = { 8d44245c 50 ff15???????? 33c0 5f 5e } // n = 6, score = 100 // 8d44245c | push eax // 50 | push dword ptr [esi + 0xc] // ff15???????? | // 33c0 | push dword ptr [ebp + 8] // 5f | push dword ptr [esi + 4] // 5e | push dword ptr [esi + 0x44] $sequence_45 = { 8d1c88 43 8b041a 41 8985a0000000 } // n = 5, score = 100 // 8d1c88 | dec eax // 43 | test eax, eax // 8b041a | je 0x1e // 41 | dec eax // 8985a0000000 | lea edx, [0x10c73] $sequence_46 = { 48 8b8d28010000 48 85c9 7402 ffd6 } // n = 6, score = 100 // 48 | cli // 8b8d28010000 | cli // 48 | cli // 85c9 | cli // 7402 | cli // ffd6 | outsb dx, byte ptr [esi] $sequence_47 = { 50 e8???????? 83c40c 8d85c8feffff 68???????? 50 } // n = 6, score = 100 // 50 | mov dword ptr [esi + 0x58], edx // e8???????? | // 83c40c | je 0x1c // 8d85c8feffff | push ebx // 68???????? | // 50 | movzx ebx, word ptr [ecx] $sequence_48 = { 1515151515 1515151515 1515151011 12????????15 1515151515 1515151515 } // n = 6, score = 100 // 1515151515 | pop edi // 1515151515 | pop esi // 1515151011 | pop ebx // 12????????15 | // 1515151515 | xor ecx, esp // 1515151515 | mov eax, 1 $sequence_49 = { 68???????? 50 ff15???????? 6a30 } // n = 4, score = 100 // 68???????? | // 50 | outsb dx, byte ptr gs:[esi] // ff15???????? | // 6a30 | je 6 condition: 7 of them and filesize < 327680 }
import "pe" rule win_microcin_w0 { meta: description = "Malware sample mentioned in Microcin technical report by Kaspersky" author = "Florian Roth" reference = "https://securelist.com/files/2017/09/Microcin_Technical-PDF_eng_final.pdf" date = "2017-09-26" hash1 = "49816eefcd341d7a9c1715e1f89143862d4775ba4f9730397a1e8529f5f5e200" hash2 = "a73f8f76a30ad5ab03dd503cc63de3a150e6ab75440c1060d75addceb4270f46" hash3 = "9dd9bb13c2698159eb78a0ecb4e8692fd96ca4ecb50eef194fa7479cb65efb7c" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.microcin" malpedia_version = "20170413" malpedia_license = "CC BY-NC-SA 4.0" malpedia_sharing = "TLP:WHITE" strings: $s1 = "e Class Descriptor at (" fullword ascii $s2 = ".?AVCAntiAntiAppleFrameRealClass@@" fullword ascii $s3 = ".?AVCAntiAntiAppleFrameBaseClass@@" fullword ascii $s4 = ".?AVCAppleBinRealClass@@" fullword ascii $s5 = ".?AVCAppleBinBaseClass@@" fullword ascii condition: uint16(0) == 0x5a4d and filesize < 300KB and (4 of them or pe.imphash() == "897077ca318eaf629cfe74569f10e023") }
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