├── LICENSE ├── README.md ├── Yobi.html ├── dependencies ├── bootstrap_cstm.min.css ├── jquery-3.6.0.min.js ├── jszip_pr696.min.js ├── libyara-wasm.js └── sjcl.js ├── icons ├── copy.png ├── emoji-frown-fill.svg ├── emoji-laughing.svg ├── icon128.png ├── icon64.png └── virus.png ├── manifest.json ├── options.html ├── options.js ├── popup ├── popup.css ├── popup.html └── popup.js ├── screens ├── scr1.png └── scr2.png └── yobi.js /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. 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Interpretation of Sections 15 and 16. 613 | 614 | If the disclaimer of warranty and limitation of liability provided 615 | above cannot be given local legal effect according to their terms, 616 | reviewing courts shall apply local law that most closely approximates 617 | an absolute waiver of all civil liability in connection with the 618 | Program, unless a warranty or assumption of liability accompanies a 619 | copy of the Program in return for a fee. 620 | 621 | END OF TERMS AND CONDITIONS 622 | 623 | How to Apply These Terms to Your New Programs 624 | 625 | If you develop a new program, and you want it to be of the greatest 626 | possible use to the public, the best way to achieve this is to make it 627 | free software which everyone can redistribute and change under these terms. 628 | 629 | To do so, attach the following notices to the program. It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | 635 | Copyright (C) 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Yobi 2 | 3 | drawing 4 | 5 | [

Install Yobi Here

](https://addons.mozilla.org/en-US/firefox/addon/yobi/) 6 | 7 | ***Yara Based Detection for web browsers*** 8 | 9 | Yobi is a basic firefox extension which allows to run public or private YARA rules on all scripts and pages rendered by the browser. 10 | Yobi saves files that trigger its rules and allows further inspection of them. 11 | 12 | Yobi is completly serverless - no telemtry or other information is collected. 13 | 14 | ## Manual Installation 15 | 16 | 1. clone the repo. 17 | 2. Go to `about:debugging` in firefox or other Gecko based browser, click "This Firefox"-> Load Temporary Add on and select manifest.json. 18 | 3. Done! 19 | 20 | ## What can Yobi do? 21 | 22 | 1. Capture any file requested by the web browser and identified as malicious by a YARA rule. 23 | 2. Use custom YARA rules. 24 | 3. Download the malicious files (as zip, default password is "infected"). 25 | 4. Query the file hash in VirusTotal. 26 | 27 | 28 | ## YARA rules 29 | 30 | YARA rules are fetched from a repository of JS rules I created: [js-yara-rules](https://github.com/imp0rtp3/js-yara-rules/). The repo consists of free JS rules I found on the internet and some I wrote myself. Feel free to create pull requests for additional rellevant rules. 31 | 32 | You can change the yara rules the extension uses under Add-ons->Yobi->Preferences 33 | 34 | Right now, YARA version 4.0.5 is used. libyara-wasm will be updated shortly and Yobi will then run the latest YARA verions. 35 | 36 | ## Yobi's Inner Workings 37 | 38 | ### Execution Flow 39 | 40 | Yobi uses the Gecko `webrequests` feature `browser.webRequest.onBeforeRequest` which enables it to intercept any request and response. Yobi saves the buffer and forward it. The YARA rules run asynchronously to that and alert whether a match is found. 41 | 42 | 43 | ### Dependencies 44 | Yobi Depends on the following libraries: 45 | 1. [libyara-wasm](https://github.com/mattnotmitt/libyara-wasm) - A porting of the whole YARA engine to wasm 46 | 2. [SJCL](https://github.com/bitwiseshiftleft/sjcl) - JS encryption library used for calculating sha256. 47 | 3. [jszip](https://github.com/Stuk/jszip) - A compact JS library to create zip files. used [PR 6969](https://github.com/Stuk/jszip/pull/696) that added the option to encrypt the archive. 48 | 4. Bootstrap 49 | 5. jQuery 50 | 51 | ### Why doesn't Yobi block the malicious scripts? 52 | 53 | Preventing any script to run before running YARA rules on it would create a significant delay for the user.= 54 | 55 | ## Continuing Development 56 | 57 | This version is still very basic and should serve as a prototype only. Please open issues and pull request for new features or bugs you encounter. 58 | 59 | ## Contact and Feedback 60 | 61 | Contact me via twitter - [@imp0rtp3](https://twitter.com/imp0rtp3/) 62 | 63 | ## Screenshots 64 | 65 | ![Yobi alerts Dashboard Closed](https://raw.githubusercontent.com/imp0rtp3/Yobi/main/screens/scr1.png) 66 | 67 | ![Yobi alerts Dashboard Opened](https://raw.githubusercontent.com/imp0rtp3/Yobi/main/screens/scr2.png) 68 | -------------------------------------------------------------------------------- /Yobi.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | -------------------------------------------------------------------------------- /dependencies/bootstrap_cstm.min.css: -------------------------------------------------------------------------------- 1 | /*! 2 | * Generated using the Bootstrap Customizer (https://getbootstrap.com/docs/3.4/customize/) 3 | *//*! 4 | * Bootstrap v3.4.1 (https://getbootstrap.com/) 5 | * Copyright 2011-2019 Twitter, Inc. 6 | * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE) 7 | *//*! normalize.css v3.0.3 | MIT License | github.com/necolas/normalize.css */html{font-family:sans-serif;-ms-text-size-adjust:100%;-webkit-text-size-adjust:100%}body{margin:0}article,aside,details,figcaption,figure,footer,header,hgroup,main,menu,nav,section,summary{display:block}audio,canvas,progress,video{display:inline-block;vertical-align:baseline}audio:not([controls]){display:none;height:0}[hidden],template{display:none}a{background-color:transparent}a:active,a:hover{outline:0}abbr[title]{border-bottom:none;text-decoration:underline;text-decoration:underline dotted}b,strong{font-weight:bold}dfn{font-style:italic}h1{font-size:2em;margin:0.67em 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25 | return k.data},na:function(a,b,c,d,e,f){var g=[],h=sjcl.bitArray,k=h.i;d=[h.partial(8,(b.length?64:0)|d-2<<2|f-1)];d=h.concat(d,c);d[3]|=e;d=a.encrypt(d);if(b.length)for(c=h.bitLength(b)/8,65279>=c?g=[h.partial(16,c)]:0xffffffff>=c&&(g=h.concat([h.partial(16,65534)],[c])),g=h.concat(g,b),b=0;be||16n&&(sjcl.mode.ccm.fa(g/ 27 | k),n+=m),c[3]++,e=a.encrypt(c),b[g]^=e[0],b[g+1]^=e[1],b[g+2]^=e[2],b[g+3]^=e[3];return{tag:d,data:h.clamp(b,l)}}}; 28 | sjcl.mode.ocb2={name:"ocb2",encrypt:function(a,b,c,d,e,f){if(128!==sjcl.bitArray.bitLength(c))throw new sjcl.exception.invalid("ocb iv must be 128 bits");var g,h=sjcl.mode.ocb2.S,k=sjcl.bitArray,l=k.i,n=[0,0,0,0];c=h(a.encrypt(c));var m,p=[];d=d||[];e=e||64;for(g=0;g+4e.bitLength(c)&&(h=f(h,d(h)),c=e.concat(c,[-2147483648,0,0,0]));g=f(g,c); 31 | return a.encrypt(f(d(f(h,d(h))),g))},S:function(a){return[a[0]<<1^a[1]>>>31,a[1]<<1^a[2]>>>31,a[2]<<1^a[3]>>>31,a[3]<<1^135*(a[0]>>>31)]}}; 32 | sjcl.mode.gcm={name:"gcm",encrypt:function(a,b,c,d,e){var f=b.slice(0);b=sjcl.bitArray;d=d||[];a=sjcl.mode.gcm.C(!0,a,f,d,c,e||128);return b.concat(a.data,a.tag)},decrypt:function(a,b,c,d,e){var f=b.slice(0),g=sjcl.bitArray,h=g.bitLength(f);e=e||128;d=d||[];e<=h?(b=g.bitSlice(f,h-e),f=g.bitSlice(f,0,h-e)):(b=f,f=[]);a=sjcl.mode.gcm.C(!1,a,f,d,c,e);if(!g.equal(a.tag,b))throw new sjcl.exception.corrupt("gcm: tag doesn't match");return a.data},ka:function(a,b){var c,d,e,f,g,h=sjcl.bitArray.i;e=[0,0, 33 | 0,0];f=b.slice(0);for(c=0;128>c;c++){(d=0!==(a[Math.floor(c/32)]&1<<31-c%32))&&(e=h(e,f));g=0!==(f[3]&1);for(d=3;0>>1|(f[d-1]&1)<<31;f[0]>>>=1;g&&(f[0]^=-0x1f000000)}return e},j:function(a,b,c){var d,e=c.length;b=b.slice(0);for(d=0;de&&(a=b.hash(a));for(d=0;dd||0>c)throw new sjcl.exception.invalid("invalid params to pbkdf2");"string"===typeof a&&(a=sjcl.codec.utf8String.toBits(a));"string"===typeof b&&(b=sjcl.codec.utf8String.toBits(b));e=e||sjcl.misc.hmac;a=new e(a);var f,g,h,k,l=[],n=sjcl.bitArray;for(k=1;32*l.length<(d||1);k++){e=f=a.encrypt(n.concat(b,[k]));for(g=1;gg;g++)e.push(0x100000000*Math.random()|0);for(g=0;g=1<this.o&&(this.o= 40 | f);this.P++;this.b=sjcl.hash.sha256.hash(this.b.concat(e));this.L=new sjcl.cipher.aes(this.b);for(d=0;4>d&&(this.h[d]=this.h[d]+1|0,!this.h[d]);d++);}for(d=0;d>>1;this.c[g].update([d,this.N++,2,b,f,a.length].concat(a))}break;case "string":void 0===b&&(b=a.length);this.c[g].update([d,this.N++,3,b,f,a.length]);this.c[g].update(a);break;default:k=1}if(k)throw new sjcl.exception.bug("random: addEntropy only supports number, array of numbers or string");this.m[g]+=b;this.f+=b;h===this.u&&(this.isReady()!==this.u&&A("seeded",Math.max(this.o,this.f)),A("progress",this.getProgress()))}, 43 | isReady:function(a){a=this.T[void 0!==a?a:this.M];return this.o&&this.o>=a?this.m[0]>this.ba&&(new Date).valueOf()>this.Z?this.J|this.I:this.I:this.f>=a?this.J|this.u:this.u},getProgress:function(a){a=this.T[a?a:this.M];return this.o>=a?1:this.f>a?1:this.f/a},startCollectors:function(){if(!this.D){this.a={loadTimeCollector:B(this,this.ma),mouseCollector:B(this,this.oa),keyboardCollector:B(this,this.la),accelerometerCollector:B(this,this.ea),touchCollector:B(this,this.qa)};if(window.addEventListener)window.addEventListener("load", 44 | this.a.loadTimeCollector,!1),window.addEventListener("mousemove",this.a.mouseCollector,!1),window.addEventListener("keypress",this.a.keyboardCollector,!1),window.addEventListener("devicemotion",this.a.accelerometerCollector,!1),window.addEventListener("touchmove",this.a.touchCollector,!1);else if(document.attachEvent)document.attachEvent("onload",this.a.loadTimeCollector),document.attachEvent("onmousemove",this.a.mouseCollector),document.attachEvent("keypress",this.a.keyboardCollector);else throw new sjcl.exception.bug("can't attach event"); 45 | this.D=!0}},stopCollectors:function(){this.D&&(window.removeEventListener?(window.removeEventListener("load",this.a.loadTimeCollector,!1),window.removeEventListener("mousemove",this.a.mouseCollector,!1),window.removeEventListener("keypress",this.a.keyboardCollector,!1),window.removeEventListener("devicemotion",this.a.accelerometerCollector,!1),window.removeEventListener("touchmove",this.a.touchCollector,!1)):document.detachEvent&&(document.detachEvent("onload",this.a.loadTimeCollector),document.detachEvent("onmousemove", 46 | this.a.mouseCollector),document.detachEvent("keypress",this.a.keyboardCollector)),this.D=!1)},addEventListener:function(a,b){this.K[a][this.ga++]=b},removeEventListener:function(a,b){var c,d,e=this.K[a],f=[];for(d in e)e.hasOwnProperty(d)&&e[d]===b&&f.push(d);for(c=0;cb&&(a.h[b]=a.h[b]+1|0,!a.h[b]);b++);return a.L.encrypt(a.h)} 49 | function B(a,b){return function(){b.apply(a,arguments)}}sjcl.random=new sjcl.prng(6); 50 | a:try{var D,E,F,G;if(G="undefined"!==typeof module&&module.exports){var H;try{H=require("crypto")}catch(a){H=null}G=E=H}if(G&&E.randomBytes)D=E.randomBytes(128),D=new Uint32Array((new Uint8Array(D)).buffer),sjcl.random.addEntropy(D,1024,"crypto['randomBytes']");else if("undefined"!==typeof window&&"undefined"!==typeof Uint32Array){F=new Uint32Array(32);if(window.crypto&&window.crypto.getRandomValues)window.crypto.getRandomValues(F);else if(window.msCrypto&&window.msCrypto.getRandomValues)window.msCrypto.getRandomValues(F); 51 | else break a;sjcl.random.addEntropy(F,1024,"crypto['getRandomValues']")}}catch(a){"undefined"!==typeof window&&window.console&&(console.log("There was an error collecting entropy from the browser:"),console.log(a))} 52 | sjcl.json={defaults:{v:1,iter:1E4,ks:128,ts:64,mode:"ccm",adata:"",cipher:"aes"},ja:function(a,b,c,d){c=c||{};d=d||{};var e=sjcl.json,f=e.g({iv:sjcl.random.randomWords(4,0)},e.defaults),g;e.g(f,c);c=f.adata;"string"===typeof f.salt&&(f.salt=sjcl.codec.base64.toBits(f.salt));"string"===typeof f.iv&&(f.iv=sjcl.codec.base64.toBits(f.iv));if(!sjcl.mode[f.mode]||!sjcl.cipher[f.cipher]||"string"===typeof a&&100>=f.iter||64!==f.ts&&96!==f.ts&&128!==f.ts||128!==f.ks&&192!==f.ks&&0x100!==f.ks||2>f.iv.length|| 53 | 4=b.iter||64!==b.ts&&96!==b.ts&&128!==b.ts||128!==b.ks&&192!==b.ks&&0x100!==b.ks||!b.iv||2>b.iv.length||4 2 | 3 | -------------------------------------------------------------------------------- /icons/emoji-laughing.svg: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | -------------------------------------------------------------------------------- /icons/icon128.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/imp0rtp3/Yobi/9f3181bb9b6304d3ae41cc01f2201be49f9d2a76/icons/icon128.png -------------------------------------------------------------------------------- /icons/icon64.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/imp0rtp3/Yobi/9f3181bb9b6304d3ae41cc01f2201be49f9d2a76/icons/icon64.png -------------------------------------------------------------------------------- /icons/virus.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/imp0rtp3/Yobi/9f3181bb9b6304d3ae41cc01f2201be49f9d2a76/icons/virus.png -------------------------------------------------------------------------------- /manifest.json: -------------------------------------------------------------------------------- 1 | { 2 | "manifest_version": 2, 3 | "name": "Yobi", 4 | "version": "0.1.1", 5 | 6 | "description": "Yara Based Detection Engine for web browsers", 7 | "icons": { 8 | "48": "icons/icon64.png", 9 | "96": "icons/icon128.png" 10 | }, 11 | "background": { 12 | "page":"Yobi.html" 13 | }, 14 | 15 | "browser_action": { 16 | "browser_style": true, 17 | "default_popup": "popup/popup.html", 18 | "default_icon": { 19 | "16": "icons/emoji-laughing.svg", 20 | "32": "icons/emoji-laughing.svg" 21 | } 22 | }, 23 | "permissions": [ 24 | "webRequest", 25 | "webRequestBlocking", 26 | "notifications", 27 | "storage", 28 | "downloads", 29 | "" 30 | ], 31 | "content_security_policy": "script-src 'self' 'sha256-mlhRIuI1L2yvZjzLr1ruxKOhxybExil/apGVHVo2o8I=' 'unsafe-eval'; object-src 'self';", 32 | "options_ui": { 33 | "page": "options.html" 34 | }, 35 | 36 | "browser_specific_settings": { 37 | "gecko": { 38 | "id": "{b5cd734c-ce82-44fa-88c9-c700486eba4c}" 39 | } 40 | } 41 | } 42 | -------------------------------------------------------------------------------- /options.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 20 | 21 | 22 |
23 |
24 |
25 | 26 |
27 | 28 | 29 | 30 | 31 | 32 | -------------------------------------------------------------------------------- /options.js: -------------------------------------------------------------------------------- 1 | function saveOptions(e) { 2 | e.preventDefault(); 3 | browser.storage.local.set({"settings": 4 | { 5 | archive_password: document.querySelector("#arch_pass").value, 6 | yara_rules_url: document.querySelector("#yara_url").value 7 | } 8 | }); 9 | } 10 | 11 | function restoreOptions() { 12 | 13 | function setCurrentChoice(result) { 14 | document.querySelector("#arch_pass").value = result.settings.archive_password; 15 | document.querySelector("#yara_url").value = result.settings.yara_rules_url; 16 | } 17 | 18 | function onError(error) { 19 | console.log(`Error: ${error}`); 20 | } 21 | 22 | let getting = browser.storage.local.get("settings"); 23 | getting.then(setCurrentChoice, onError); 24 | } 25 | 26 | document.addEventListener("DOMContentLoaded", restoreOptions); 27 | document.querySelector("form").addEventListener("submit", saveOptions); -------------------------------------------------------------------------------- /popup/popup.css: -------------------------------------------------------------------------------- 1 | html, body { 2 | width: 400px; 3 | } 4 | 5 | .hits, .no-hits { 6 | width: 90%; 7 | margin: 0% 5%; 8 | } 9 | 10 | .no-hits { 11 | padding: 10% 0%; 12 | } 13 | 14 | .trash_icon, .copy_icon{ 15 | cursor: pointer; 16 | width: 5%; 17 | height: 5%; 18 | } 19 | 20 | .trash_icon{ 21 | float: right; 22 | margin-right: 6%; 23 | margin-top: 1.5%; 24 | } 25 | 26 | .description{ 27 | display:none; 28 | word-wrap: break-word; 29 | padding-left: 3%; 30 | padding-bottom: 2%; 31 | margin-bottom: 2%; 32 | border-radius: 0px 0px 20px 20px; 33 | padding-bottom: 15%; 34 | padding-top: 2%; 35 | } 36 | 37 | 38 | .desc_button { 39 | margin-top: 3%; 40 | width: 20%; 41 | height: 10%; 42 | float: right; 43 | margin-right: 6.6666%; 44 | margin-left: 6.66666%; 45 | } 46 | 47 | 48 | .hits_title{ 49 | text-align: center; 50 | display: none; 51 | } 52 | .no-hits { 53 | text-align: center; 54 | } 55 | 56 | .hit_item{ 57 | cursor: pointer; 58 | } 59 | 60 | 61 | .w3-theme-l5 {color:#000 !important; background-color:#fbeff1 !important} 62 | .w3-theme-l4 {color:#000 !important; background-color:#f3cbd1 !important} 63 | .w3-theme-l3 {color:#000 !important; background-color:#e796a2 !important} 64 | .w3-theme-l2 {color:#fff !important; background-color:#db6274 !important} 65 | .w3-theme-l1 {color:#fff !important; background-color:#ce2f47 !important} 66 | .w3-theme-d1 {color:#fff !important; background-color:#8a1f2f !important} 67 | .w3-theme-d2 {color:#fff !important; background-color:#7b1c2a !important} 68 | .w3-theme-d3 {color:#fff !important; background-color:#6c1825 !important} 69 | .w3-theme-d4 {color:#fff !important; background-color:#5c1520 !important} 70 | .w3-theme-d5 {color:#fff !important; background-color:#4d111a !important} 71 | 72 | .w3-theme-light {color:#000 !important; background-color:#fbeff1 !important} 73 | .w3-theme-dark {color:#fff !important; background-color:#4d111a !important} 74 | .w3-theme-action {color:#fff !important; background-color:#4d111a !important} 75 | 76 | .w3-theme {color:#fff !important; background-color:#9b2335 !important} 77 | .w3-text-theme {color:#9b2335 !important} 78 | .w3-border-theme {border-color:#9b2335 !important} 79 | 80 | .w3-hover-theme:hover {color:#fff !important; background-color:#6c1825 !important} 81 | .w3-hover-text-theme:hover {color:#5c1520 !important} 82 | .w3-hover-border-theme:hover {border-color:#9b2335 !important} 83 | -------------------------------------------------------------------------------- /popup/popup.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 |

Hits 15 | 16 | 17 | 18 | 19 |

20 |

No Hits Until now:)

21 | 24 | 28 | 29 | 30 | 31 | -------------------------------------------------------------------------------- /popup/popup.js: -------------------------------------------------------------------------------- 1 | const DEF_MAL_NAME = "sample"; 2 | 3 | 4 | function setClipboard(text) { 5 | navigator.clipboard.writeText(text); 6 | } 7 | 8 | class MatchesUpdater{ 9 | 10 | constructor(){ 11 | let self = this; 12 | this.matches_dict = {}; 13 | browser.storage.local.get("rule_matches", items => this.storage_listener(items)); 14 | this.storage_change_listener = browser.storage.onChanged.addListener( 15 | function(c,a){ 16 | self.browser_storage_change(c,a); 17 | } 18 | ); 19 | $(window).on("beforeunload", function(){ 20 | browser.storage.onChanged.removeListener(this.storage_change_listener); 21 | }); 22 | $('#trash_icon').on('click', function(e){ 23 | browser.storage.local.set({"rule_matches": {}}); 24 | }); 25 | }; 26 | 27 | storage_listener (item) { 28 | var matches = item['rule_matches']; 29 | console.log(matches); 30 | if (matches && Object.keys(matches).length){ 31 | this.matches_dict = item["rule_matches"]; 32 | this.add_rule_matches(matches); 33 | } 34 | }; 35 | 36 | onErrorStorage(error) { 37 | console.log(`[***] Error: ${error}`); 38 | }; 39 | 40 | browser_storage_change(changes, areaName) { 41 | if(areaName != "local" || !changes["rule_matches"]) { 42 | return; 43 | } 44 | if(!changes["rule_matches"].newValue || Object.keys(changes["rule_matches"].newValue).length === 0) { 45 | this.remove_matches(); 46 | return; 47 | } 48 | let new_vals = {} 49 | for(key in changes["rule_matches"].newValue) { 50 | if(!changes["rule_matches"].oldValye[key]) 51 | new_vals[key] = changes["rule_matches"].newValue[key]; 52 | } 53 | this.add_rule_matches(new_vals); 54 | }; 55 | 56 | remove_matches(){ 57 | $("#no-hits").show(); 58 | $("#hits").hide().empty(); 59 | $(".hits_title").hide(); 60 | browser.browserAction.setIcon({path: "../icons/emoji-laughing.svg"}); 61 | this.matches_dict = {}; 62 | }; 63 | 64 | add_rule_matches(matches) { 65 | let self = this; 66 | $("#no-hits").hide(); 67 | $("#hits").show(); 68 | $(".hits_title").show(); 69 | for (const sha256 in matches) { 70 | var $sig_block = $("
", {id: "list-profile-list", class: ""}); 71 | var $link = $("", {class: "w3-theme-d5 hit_item w3-hover-theme w3-hover-border-theme list-group-item"}); 72 | var $desc = $("
", {id: "description", class:"w3-theme-l5 w3-text-theme description"}); 73 | var $cp_img = $('', {class:"copy_icon", id: "copy_icon", src:"../icons/copy.png"}); 74 | var url = new URL(matches[sha256].url); 75 | var host = url.host; 76 | if(!matches[sha256].file_name) 77 | $link.html(`

${host}

`); 78 | else 79 | { 80 | $link.html(`

${host}

 - ${matches[sha256].file_name}`); 81 | } 82 | var desc_html = `Matches: ${Object.keys(matches[sha256].matches).join(', ')}
83 | Sha256:
${sha256}
`; 84 | desc_html += `VT`; 85 | desc_html += ``; 86 | desc_html += ``; 87 | $desc.html(desc_html); 88 | $link.on('click', function (e) { 89 | e.preventDefault(); 90 | $(this).parent().children('#description').eq(0).toggle(); 91 | }); 92 | $sig_block.append($link); 93 | $sig_block.append($desc); 94 | $("#hits").append($sig_block); 95 | $cp_img.clone().appendTo(`#hash_${sha256}`).on('click', function(e) 96 | { 97 | setClipboard($(this).parent().text()); 98 | }); 99 | $(`#download_sample${sha256}`).on('click', function (e) 100 | { 101 | self.download_sample(sha256); 102 | }); 103 | $(`#download_details${sha256}`).on('click', function (e) 104 | { 105 | const blob = new Blob([JSON.stringify(self.matches_dict[sha256], null, 4)], {type : 'application/json'}); 106 | const download_url = URL.createObjectURL(blob); 107 | browser.downloads.download({url: download_url, filename: `${sha256}.json`}); 108 | }); 109 | } 110 | }; 111 | 112 | download_sample(sha256) 113 | { 114 | const var_name = 'sample_' + sha256; 115 | let self = this; 116 | browser.storage.local.get(var_name).then(item => this.gotFile(item) , self.onError); 117 | } 118 | 119 | async gotFile (item){ 120 | const sha256 = Object.keys(item)[0].slice(-64); // Take out the "sample_" 121 | const obj = decodeURIComponent(atob(Object.values(item)[0])); 122 | let encoder = new TextEncoder(); 123 | const filename = (this.matches_dict[sha256].file_name || DEF_MAL_NAME) + ".dnr"; 124 | const zip_pass = (await browser.storage.local.get("settings")).settings.archive_password; 125 | 126 | // Script loaded only here to prevent it slowing the popup when it loads 127 | await $.getScript("../dependencies/jszip_pr696.min.js"); 128 | var zip = new JSZip(); 129 | zip.file(filename, encoder.encode(obj)); 130 | zip.generateAsync({type:"blob", password: zip_pass , encryptStrength: 3,}).then( 131 | function(content) { 132 | const blob = new Blob([content], {type : 'application/zip'}); 133 | const download_url = URL.createObjectURL(blob); 134 | browser.downloads.download({url: download_url, filename: `${sha256}.zip`}); 135 | }); 136 | } 137 | 138 | onError(e){ 139 | console.log(`Error retrieving File: ${e}`); 140 | } 141 | } 142 | 143 | let MU = new MatchesUpdater(); 144 | 145 | 146 | 147 | 148 | 149 | 150 | -------------------------------------------------------------------------------- /screens/scr1.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/imp0rtp3/Yobi/9f3181bb9b6304d3ae41cc01f2201be49f9d2a76/screens/scr1.png -------------------------------------------------------------------------------- /screens/scr2.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/imp0rtp3/Yobi/9f3181bb9b6304d3ae41cc01f2201be49f9d2a76/screens/scr2.png -------------------------------------------------------------------------------- /yobi.js: -------------------------------------------------------------------------------- 1 | let scan_queue = []; 2 | const MSG_MATCH = 1; 3 | const MSG_ERROR = 2; 4 | const DEF_RULES_URL = 'https://raw.githubusercontent.com/imp0rtp3/js-yara-rules/main/all_rules.yar'; 5 | const MAL_EMOJI_PATH = "icons/emoji-frown-fill.svg"; 6 | const MAL_ALERT_PATH = "icons/virus.png"; 7 | 8 | // used only in the listener function, declared and set here to prevent it from 9 | // being created anew every time the function is called 10 | let decoder = new TextDecoder("utf-8"); 11 | 12 | class utils { 13 | 14 | static sleep(ms) { 15 | return new Promise(resolve => setTimeout(resolve, ms)); 16 | } 17 | 18 | static toHexString(byteArray) { 19 | // Converts a bytearray from jscl hash function to hexadecimal string 20 | return Array.from(byteArray, function(byte) { 21 | return ('00000000' + (byte > -1 ? (byte & 0x7FFFFFFF) : 0x100000000 + byte ).toString(16)).slice(-8); 22 | }).join(''); 23 | } 24 | 25 | static set_icon_malfound(){ 26 | // Changes the icon in the top-right corner to indicate malicious item found" 27 | browser.browserAction.setIcon({path: MAL_EMOJI_PATH}); 28 | } 29 | } 30 | 31 | class YaraScanner 32 | { 33 | /* 34 | Module handling the parsing and running of the yara rules 35 | */ 36 | constructor(yara_module) 37 | { 38 | let self = this; 39 | 40 | // Dictionary of files scanned by SHA256, to avoid runnning yara on same file twice 41 | this.documents_scanned = {} 42 | 43 | // Queue that the ContentReceiver fills with webrequests intercepted by the add-on 44 | this.yara_eng = yara_module; 45 | // Queue filled by Yarascanner of messages that the contentReceiver needs to send 46 | this._messages_qu = []; 47 | // Yara parser for extracting metadata 48 | this.get_yara_rules().then(x => {self.check_for_yara_errors();}); 49 | 50 | this.yara_worker_loop = setInterval(function(x){ 51 | self.yara_worker(); 52 | }, 1000); 53 | } 54 | 55 | check_for_yara_errors(){ 56 | const yara_matches = this.yara_eng.run("test", this.raw_yara_rules); 57 | if (yara_matches.compileErrors.size() === 0) { 58 | return false; 59 | } 60 | for (let i = yara_matches.compileErrors.size()-1; i >= 0; i--) { 61 | const compileError = yara_matches.compileErrors.get(i); 62 | if (!compileError.warning) { 63 | messenger.report_error(`Error on line ${compileError.lineNumber}: ${compileError.message} in YARA rules`); 64 | throw new OperationError(`Error on line ${compileError.lineNumber}: ${compileError.message}`); 65 | } 66 | } 67 | } 68 | 69 | async get_yara_rules(){ 70 | /* 71 | This funciton clones a repository to local (or updates it) and then just returns 72 | a string with all the rules in its 'yara' directory 73 | */ 74 | let response; 75 | const rules_url = (await browser.storage.local.get("settings")).settings.yara_rules_url || DEF_RULES_URL; 76 | try 77 | { 78 | response = await fetch(rules_url); 79 | } 80 | catch(e) 81 | { 82 | messenger.report_error(`[***] Problem Fetching Rules: ${e.message}`); 83 | await this.get_rules_from_ls(); 84 | return false; 85 | } 86 | if (response.ok) { // if HTTP-status is 200-299 87 | this.raw_yara_rules = await response.text(); 88 | browser.storage.local.set({"raw_rules": this.raw_yara_rules}); 89 | return true; 90 | } 91 | messenger.report_error('[***] Problem Fetching Rules - Bad Response Code'); 92 | await this.get_rules_from_ls(); 93 | return false; 94 | } 95 | 96 | async get_rules_from_ls(){ 97 | /* 98 | Get rules from localstorage - used only if the rules site is not accessible 99 | */ 100 | let self = this 101 | await browser.storage.local.get("raw_rules", function(item){ 102 | if(!item['raw_rules'].length){ 103 | clearInterval(self.yara_worker_loop) 104 | messenger.report_error("[***] Error - no rules saved in Localstorage, stopping Yobi!"); 105 | throw Exception; 106 | } 107 | self.raw_yara_rules = item["raw_rules"]; 108 | }); 109 | } 110 | 111 | yara_worker(){ 112 | /* 113 | This function is actually running the rules. 114 | */ 115 | while(scan_queue.length > 0){ 116 | const scan_item = scan_queue.shift(); 117 | const content_sha256 = utils.toHexString(sjcl.hash.sha256.hash(scan_item[1])); 118 | 119 | // Check if the file was already scanned, for efficiency 120 | if(!this.documents_scanned[content_sha256]){ 121 | 122 | // init basic structure. 123 | this.documents_scanned[content_sha256] = {'is_match' : false, 'matches': {}, 'urls': []}; 124 | 125 | // Here the yara actually runs 126 | const yara_matches = this.yara_eng.run(scan_item[1], this.raw_yara_rules); 127 | 128 | if(yara_matches.matchedRules.size() === 0) 129 | continue; 130 | 131 | this.documents_scanned[content_sha256]['is_match'] = true; 132 | 133 | // Convert matchedRules libyara-wasm Object to a nice dictionary. 134 | for (let i = yara_matches.matchedRules.size() - 1; i >= 0; i--) { 135 | let metadata = {}; 136 | const rule = yara_matches.matchedRules.get(i); 137 | for (let j = rule.metadata.size() - 1; j >= 0 ; j--) { 138 | metadata[rule.metadata.get(j).identifier] = rule.metadata.get(j).data; 139 | } 140 | this.documents_scanned[content_sha256]['matches'][rule.ruleName] = metadata; 141 | } 142 | } 143 | else if(!this.documents_scanned[content_sha256]['is_match']){ 144 | continue; 145 | } 146 | { 147 | // Scoped so not every loop iterations the below variables will be declared 148 | // (because of hoisting) 149 | const url = scan_item[0]; 150 | const file_path = (new URL(url).pathname) || ''; 151 | let filename = ''; 152 | this.documents_scanned[content_sha256]['urls'].push(url) 153 | if(file_path.length > 2) { 154 | // Get the last directory or file in the URL. 155 | // If it's https://example.com/hello/world/ - get 'world' and not '' 156 | filename = file_path.split('/').slice(-1)[0] || file_path.split('/').slice(-2)[0]; 157 | } 158 | const message = { 159 | 'type': MSG_MATCH, 160 | 'data': 161 | { 162 | 'url': url, 163 | 'file_name' : filename, 164 | 'matches': this.documents_scanned[content_sha256]['matches'], 165 | 'first_time':this.documents_scanned[content_sha256]['urls'].length === 1, 166 | 'sha256': content_sha256, 167 | } 168 | }; 169 | messenger.new_message(message); 170 | this.save_file(scan_item[1], content_sha256); 171 | } 172 | } 173 | } 174 | 175 | save_file(data, sha256) 176 | { 177 | function setItem() { 178 | return; 179 | } 180 | 181 | function onError(error) { 182 | messenger.report_error(`[***] Error Saving File: ${error}`); 183 | } 184 | 185 | let dict = {}; 186 | dict[`sample_${sha256}`] = btoa(encodeURIComponent(data)); 187 | browser.storage.local.set(dict).then(setItem, onError); 188 | } 189 | } 190 | 191 | class messenger{ 192 | 193 | static async new_message(data) { 194 | switch(data.type) { 195 | case MSG_MATCH: 196 | 197 | // Change the icon in the toolbar to the icon indicating suspisious script 198 | utils.set_icon_malfound(); 199 | browser.notifications.create({ 200 | "type": "basic", 201 | "iconUrl": browser.runtime.getURL(MAL_ALERT_PATH), 202 | "title": "Found Suspicious File!", 203 | "message": `Found ${Object.keys(data.data.matches).toString()} in ${data.data.url.replace('://','[:]//')}` 204 | }); 205 | 206 | // Update the rule_matches browser localstorage for the popup 207 | browser.storage.local.get("rule_matches", function(items) 208 | { 209 | let rm = items['rule_matches'] || {}; 210 | rm[data.data.sha256] = data.data; 211 | browser.storage.local.set({"rule_matches": rm}); 212 | }); 213 | break; 214 | case MSG_ERROR: 215 | browser.notifications.create({ 216 | "type": "basic", 217 | "iconUrl": browser.runtime.getURL(MAL_ALERT_PATH), 218 | "title": "Error!", 219 | "message": data.data.message 220 | }); 221 | browser.storage.local.get("errors", function(items) 222 | { 223 | const rm = (items['errors'] || []).concat(data.data); 224 | browser.storage.local.set({"errors": rm}); 225 | }); 226 | break; 227 | } 228 | } 229 | 230 | static report_error(message){ 231 | let error_msg = {type: MSG_ERROR, data: {'message' : message} }; 232 | messenger.new_message(error_msg); 233 | } 234 | } 235 | 236 | 237 | function listener(details) { 238 | /* This function is responsible for intercepting all rellevant requests, 239 | putting it in a filequeue and also forwarding it. 240 | It is called thousands of times and any delay here makes pages load slower, thus 241 | performance is preferred over readability. 242 | */ 243 | let filter = browser.webRequest.filterResponseData(details.requestId); 244 | let raw_data = []; 245 | 246 | filter.ondata = event => { 247 | filter.write(event.data); 248 | raw_data.push(event.data); 249 | }; 250 | 251 | filter.onstop = event => { 252 | filter.close(); 253 | if(raw_data.length === 1) 254 | { 255 | // Most likely scenario 256 | scan_queue.push([details.url, decoder.decode(raw_data[0])]); 257 | } 258 | else if(raw_data.length > 1) 259 | { 260 | scan_queue.push([details.url, raw_data.map(x => decoder.decode(x,{stream: true})).join("")]); 261 | } 262 | }; 263 | } 264 | 265 | function init_yobi(){ 266 | 267 | // Register the listener intercepting all interesting files. 268 | // Called first so not to miss any pages loading. 269 | browser.webRequest.onBeforeRequest.addListener( 270 | listener, 271 | { 272 | "urls":[""], 273 | "types": ["main_frame", "script", "object", "sub_frame", "other"] 274 | }, 275 | ["blocking"] 276 | ); 277 | 278 | 279 | browser.storage.local.get("settings", async function(item){ 280 | if(!item['settings']) 281 | { 282 | await browser.storage.local.set({"settings": 283 | { 284 | "archive_password": "infected", 285 | "yara_rules_url": DEF_RULES_URL 286 | } 287 | }); 288 | } 289 | 290 | // Start Yarascanner only when settings are initialized. 291 | // "Module" is the name of the libyara-wasm module. 292 | new Module().then(async Module => { 293 | let YS = new YaraScanner(Module); 294 | }); 295 | }); 296 | 297 | // Check if matches have already been found and change icon accordingly 298 | browser.storage.local.get("rule_matches", function(item){ 299 | if(item['rule_matches'] && Object.keys(item['rule_matches']).length > 0){ 300 | utils.set_icon_malfound(); 301 | } 302 | }); 303 | } 304 | 305 | init_yobi(); --------------------------------------------------------------------------------