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Js Ast二部曲:某V5 “绝对不可逆加密” 一探究竟

信息分享 信息分享 55469 人阅读 | 194 人回复 | 2020-05-02

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本文是前几天发的《Js Ast一部曲:高完整度还原某V5的加密》的进阶,上一篇文章提到过的内容本文就不重新讲解了,所以还没看过上一篇文章的小伙伴记得先去看一下哦。
我就不说闲话了,直入主题。 本文既然是进阶篇,当然要加大难度,所以,选项配置如下图,全部点亮 & 系数选最高。






初:我们依旧先来看一下前后的对比。
还原前(格式化后900+行,所以我就不展示格式化后的内容了,可以找  在线js格式化网站  自行格式化哦。)
/*
 * 加密工具已经升级了一个版本,目前为 sojson.v5 ,主要加强了算法,以及防破解【绝对不可逆】配置,耶稣也无法100%还原,我说的。;
 * 已经打算把这个工具基础功能一直免费下去。还希望支持我。
 * 另外 sojson.v5 已经强制加入校验,注释可以去掉,但是 sojson.v5 不能去掉(如果你开通了VIP,可以手动去掉),其他都没有任何绑定。
 * 誓死不会加入任何后门,sojson JS 加密的使命就是为了保护你们的Javascript 。
 * 警告:如果您恶意去掉 sojson.v5 那么我们将不会保护您的JavaScript代码。请遵守规则
 * 新版本: https://www.jsjiami.com/ 支持批量加密,支持大文件加密,拥有更多加密。 */
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还原后(可以根据这个代码学习下某V5的反爬逻辑。):
/* * 加密工具已经升级了一个版本,目前为 sojson.v5 ,主要加强了算法,以及防破解【绝对不可逆】配置,耶稣也无法100%还原,我说的。; * 已经打算把这个工具基础功能一直免费下去。还希望支持我。 * 另外 sojson.v5 已经强制加入校验,注释可以去掉,但是 sojson.v5 不能去掉(如果你开通了VIP,可以手动去掉),其他都没有任何绑定。 * 誓死不会加入任何后门,sojson JS 加密的使命就是为了保护你们的Javascript 。 * 警告:如果您恶意去掉 sojson.v5 那么我们将不会保护您的JavaScript代码。请遵守规则 * 新版本: https://www.jsjiami.com/ 支持批量加密,支持大文件加密,拥有更多加密。 */var encode_version = 'sojson.v5';
setInterval(function () {
    _0x1c3a01();
}, 4000);
var _0xf3d9f8 = {},
    _0x311965 = {};

(function () {
    var _0x440a30 = function () {
        var _0x333865 = true;
        return function (_0x3bb96b, _0x442e92) {
            var _0x24e638 = _0x333865 ? function () {
                if (_0x442e92) {
                    if ("IrD" !== "IrD") {
                        _0x1c3a01();
                    } else {
                        var _0x291809 = _0x442e92.apply(_0x3bb96b, arguments);

                        _0x442e92 = null;
                        return _0x291809;
                    }
                }
            } : function () {};

            _0x333865 = false;
            return _0x24e638;
        };
    }();

    var _0x140713 = _0x440a30(this, function () {
        if ("qQF" === "HGj") {} else {
            var _0x31f4ee = function () {};

            var _0x46e439 = typeof window !== "undefined" ? window : typeof process === "object" && typeof require === "function" && typeof global === "object" ? global : this;

            if (!_0x46e439.console) {
                _0x46e439.console = function (_0x29af64) {
                    var _0x4d6910 = {};
                    _0x4d6910.log = _0x29af64;
                    _0x4d6910.warn = _0x29af64;
                    _0x4d6910.debug = _0x29af64;
                    _0x4d6910.info = _0x29af64;
                    _0x4d6910.error = _0x29af64;
                    _0x4d6910.exception = _0x29af64;
                    _0x4d6910.trace = _0x29af64;
                    return _0x4d6910;
                }(_0x31f4ee);
            } else {
                _0x46e439.console.log = _0x31f4ee;
                _0x46e439.console.warn = _0x31f4ee;
                _0x46e439.console.debug = _0x31f4ee;
                _0x46e439.console.info = _0x31f4ee;
                _0x46e439.console.error = _0x31f4ee;
                _0x46e439.console.exception = _0x31f4ee;
                _0x46e439.console.trace = _0x31f4ee;
            }
        }
    });

    _0x140713();

    _0xf3d9f8.info = "这是一个一系列js操作。";
    _0x311965.adinfo = "站长接高级 “JS加密” 和 “JS解密” ,保卫你的 js。";
    _0x311965.warning = "如果您的JS里嵌套了PHP,JSP标签,等等其他非JavaScript的代码,请提取出来再加密。这个工具不能加密php、jsp等模版内容";
})();

;

(function () {
    var _0x3c6056 = function () {
        var _0x2a5310 = true;
        return function (_0x1b942d, _0x3b8575) {
            var _0x176f45 = _0x2a5310 ? function () {
                if (_0x3b8575) {
                    if ("uGr" === "uGr") {
                        var _0x46d57c = _0x3b8575.apply(_0x1b942d, arguments);

                        _0x3b8575 = null;
                        return _0x46d57c;
                    } else {
                        var _0x457b55 = _0x2a5310 ? function () {
                            if (_0x3b8575) {
                                var _0x543c58 = _0x3b8575.apply(_0x1b942d, arguments);

                                _0x3b8575 = null;
                                return _0x543c58;
                            }
                        } : function () {};

                        _0x2a5310 = false;
                        return _0x457b55;
                    }
                }
            } : function () {};

            _0x2a5310 = false;
            return _0x176f45;
        };
    }();

    (function () {
        _0x3c6056(this, function () {
            if ("mOx" !== "vuc") {
                var _0x45b1fe = new RegExp("function *\\( *\\)");

                var _0x3efcd1 = new RegExp("\\+\\+ *(?:_0x(?:[a-f0-9]){4,6}|(?:\\b|\\d)[a-z0-9]{1,4}(?:\\b|\\d))", "i");

                var _0x38da44 = _0x1c3a01("init");

                if (!_0x45b1fe.test(_0x38da44 + "chain") || !_0x3efcd1.test(_0x38da44 + "input")) {
                    if ("fMO" !== "IkJ") {
                        _0x38da44("0");
                    } else {}
                } else {
                    _0x1c3a01();
                }
            } else {
                _0x38da44("0");
            }
        })();
    })();

    _0x56d2cc = "al";

    try {
        if ("XOP" === "gNX") {
            if (fn) {
                var _0x435156 = fn.apply(context, arguments);

                fn = null;
                return _0x435156;
            }
        } else {
            _0x56d2cc += "ert";
            _0x2751cd = encode_version;

            if (!(typeof _0x2751cd !== "undefined" && _0x2751cd === "sojson.v5")) {
                window[_0x56d2cc]("删除" + "版本号,js会定期弹窗,还请支持我们的工作");
            }
        }
    } catch (_0x3e91ee) {
        window[_0x56d2cc]("删除版本号,js会定期弹窗");
    }
})();

function _0x1c3a01(_0x5ddda7) {
    function _0x1ff2aa(_0x123e9f) {
        if ("Uug" !== "Uug") {
            var _0x13562b = {};
            _0x13562b.log = _0x333f93;
            _0x13562b.warn = _0x333f93;
            _0x13562b.debug = _0x333f93;
            _0x13562b.info = _0x333f93;
            _0x13562b.error = _0x333f93;
            _0x13562b.exception = _0x333f93;
            _0x13562b.trace = _0x333f93;
            return _0x13562b;
        } else {
            if (typeof _0x123e9f === "string") {
                if ("IRY" === "Zof") {} else {
                    var _0x333f93 = function () {
                        while (true) {
                            if ("EUS" !== "EUS") {
                                that.console = function (_0x148d84) {
                                    var _0x17da92 = {};
                                    _0x17da92.log = _0x148d84;
                                    _0x17da92.warn = _0x148d84;
                                    _0x17da92.debug = _0x148d84;
                                    _0x17da92.info = _0x148d84;
                                    _0x17da92.error = _0x148d84;
                                    _0x17da92.exception = _0x148d84;
                                    _0x17da92.trace = _0x148d84;
                                    return _0x17da92;
                                }(_0x333f93);
                            } else {}
                        }
                    };

                    return _0x333f93();
                }
            } else {
                if ("rRS" !== "rRS") {
                    w[c]("删除版本号,js会定期弹窗");
                } else {
                    if (("" + _0x123e9f / _0x123e9f).length !== 1 || _0x123e9f % 20 === 0) {
                        debugger;
                    } else {
                        if ("bQe" === "bQe") {
                            debugger;
                        } else {
                            var _0x104e3e = new RegExp("function *\\( *\\)");

                            var _0x92098a = new RegExp("\\+\\+ *(?:_0x(?:[a-f0-9]){4,6}|(?:\\b|\\d)[a-z0-9]{1,4}(?:\\b|\\d))", "i");

                            var _0x2fd33c = _0x1c3a01("init");

                            if (!_0x104e3e.test(_0x2fd33c + "chain") || !_0x92098a.test(_0x2fd33c + "input")) {
                                _0x2fd33c("0");
                            } else {
                                _0x1c3a01();
                            }
                        }
                    }
                }
            }

            _0x1ff2aa(++_0x123e9f);
        }
    }

    try {
        if ("abF" === "Wpp") {
            while (true) {}
        } else {
            if (_0x5ddda7) {
                return _0x1ff2aa;
            } else {
                _0x1ff2aa(0);
            }
        }
    } catch (_0x3df595) {
        if ("vrD" !== "vrD") {
            var _0x30595b = function () {
                while (true) {}
            };

            return _0x30595b();
        } else {}
    }
}

;
encode_version = "sojson.v5";


我们可以看到,原逻辑 和 某v5添加的各种反调试代码 已经很清晰了,完全达到了易读易调试的目的。那么我来介绍一下用到的Ast 操作首先要说的是,本文和上一篇文章还是有不同的,毕竟写Js Ast系列的初衷是为了给大家揭开Ast的神秘面纱,借用某V5的平台 展示如何将各种Ast 高大上的理论落地到实际应用中,而不是为了破解某V5,所以本文不会从0到100的完全展示如何还原,只对上一篇文章没介绍 但有意义的操作(如 反控制流平坦化)进行讲解,毕竟如果源码放出去那某V5 甚至新版的某V6 都要受到一些影响。。。连大佬都用obfuscator进行演示,我还是不要头铁了。。。其实,如果这两篇文章的内容都掌握的话,那么你就完全有能力写出还原逻辑了,所以不要失望哦,哈哈。好了,那正式开始介绍。1,一堆unicode或16进制表示的代码看着头疼,怎么破?对babel来说,处理这类混淆很简单,编码混淆常见的有两种:字符串或数字:如下图










可以看到对应的 Ast Node 的 type 为StringLiteral或NumericLiteral,而value属性中是真实值,extra属性中是被混淆后的值,那么我们直接将这两个type的extra属性删掉,就会显示真实值了,代码如下:

traverse(ast,{
    StringLiteral:delExtra,
    NumericLiteral:delExtra
})

function delExtra(path) {
    var curNode = path.node;
    delete curNode.extra;
}

效果:












2,上一篇评论中有建议是,像 _0x19882c['removeCookie']['toString']() 应该转换成 _0x19882c.removeCookie.toString() 这样利于我们调试的格式,怎么处理?对于Ast的操作当然要先观察Ast的结构喽,我们来看一下结构:







可以看到type为MemberExpression,唯一的不同之处就是computed的值,那就很好办了,我们针对type为MemberExpression的节点,将其computed值改为false就好了,代码如下:traverse(ast,{
    MemberExpression:formatMember
})

// 改变调用方式
function formatMember(path) {
    var curNode = path.node;
    if(!t.isStringLiteral(curNode.property))
        return;
    if(curNode.computed===undefined || !curNode.computed === true)
        return;
    curNode.property = t.identifier(curNode.property.value);
    curNode.computed = false;
}


3,让我们借某V5混淆 谈一下控制流平坦化 如何还原先看 控制流平坦化 后的代码是什么样子的:

var _0x289a30 = "4|6|2|3|1|5|0".split("|"),
    _0x2690ba = 0;
while (true) {
    switch (_0x289a30[_0x2690ba++]) {
        case "0":
            _0x46e439.console.trace = _0x31f4ee;
            continue;
        case "1":
            _0x46e439.console.error = _0x31f4ee;
            continue;
        case "2":
            _0x46e439.console.debug = _0x31f4ee;
            continue;
        case "3":
            _0x46e439.console.info = _0x31f4ee;
            continue;
        case "4":
            _0x46e439.console.log = _0x31f4ee;
            continue;
        case "5":
            _0x46e439.console.exception = _0x31f4ee;
            continue;
        case "6":
            _0x46e439.console.warn = _0x31f4ee;
            continue;
    }
    break;
}

然后,我们再来分析下Ast的结构:






结构很清晰,那我们想要还原的话,流程就很容易想到了,以本例来说,流程为: 0,我们拦截type为WhileStatement 的 Ast节点。 1,准备一个临时数组。 2,获取_0x289a30数组。3,遍历_0x289a30数组,依次取出对应的SwitchCase节点,将每个SwitchCase节点的ExpressionStatement添加到临时数组中,4,用临时数组替换掉SwitchStatement节点。5,删掉_0x289a30所在的节点。让我们看一下代码:

traverse(ast, {
    WhileStatement: replaceWhile
})
function(path)
{
    // 判断是否是目标节点
    var node = path.node;
    if (!t.isBooleanLiteral(node.test) || node.test.value != true)
        return; 
    if (!t.isBlockStatement(node.body))
        return;
        
    var body = node.body.body;
    if (!t.isSwitchStatement(body[0]) || !t.isMemberExpression(body[0].discriminant) || !t.isBreakStatement(body[1]))
        return;
    
    var swithStm = body[0];
    var arrName = swithStm.discriminant.object.name;
    
    // 找到path节点的前一个兄弟节点,即_0x289a30所在的节点,然后获取_0x289a30数组
    var prevSiblingPath = path.getPrevSibling();
    var arrNode = prevSiblingPath.node.declarations.filter(declarator => declarator.id.name == arrName)[0];
    var idxArr = arrNode.init.callee.object.value.split('|');
    
    // SwitchCase节点集合
    var caseList = swithStm.cases;
    var resultBody = [];
    
    idxArr.map(targetIdx => {
    var targetBody = caseList[targetIdx].consequent;
    // 删除ContinueStatement块(continue语句)
    if (t.isContinueStatement(targetBody[targetBody.length - 1]))
        targetBody.pop();
    resultBody = resultBody.concat(targetBody)
    });
    
    // 多个节点替换一个节点的话使用replaceWithMultiple方法
    path.replaceWithMultiple(resultBody);
    
    // 删除_0x289a30所在的节点
    prevSiblingPath.remove();
}

还原后效果:






很清晰,good。







4, 第一篇文章中提到了将自执行方法的实参替换到方法体内,但是这样还有一个问题,就是自执行函数变多之后,我们打断点比较麻烦,所以我们应该将实参为空的自执行函数转为顺序语句。下面我们来转换一下:




分析Ast结构后,我们可以想到,只需要拦截type 为 ExpressionStatement 的node节点,然后判断条件符合后使用BlockStatement替换掉ExpressionStatement 即可,代码如下:

// 替换空参数的自执行方法为顺序语句
traverse(ast,{
    ExpressionStatement:function (path) {
        let node = path.node;
        // 判断条件是否符合
        if (!t.isCallExpression(node.expression))
            return;
        if (node.expression.arguments !== undefined && node.expression.arguments.length > 0)
            return;
        if (!t.isFunctionExpression(node.expression.callee))
            return;
        // 替换节点
        path.replaceWith(node.expression.callee.body);
    },
})





后记:
好了,讲解到这里,也算是把使用Ast还原 某V5的混淆 会使用到的逻辑 说了七七八八了,相信小伙伴们跟着走一遍的话, 完全有能力还原 本文开始时展示的那一长串代码,处理其他平台的混淆也不再是问题,所以暂时关于Ast的文章会告一段落。接下来我的重点是研究学习某数的反爬技巧,在这个 人均某数 的年代,我如果再不研究就跟不上潮流喽,如果有进展,在没有法律风险的情况下,我也会都分享出来的。比较可惜的是作用域管理没有实战的机会,但是听说处理某数的混淆会有作用域管理方面的需求,所以如果真的应用上的话,我还是会 借某数平台的逻辑写Ast第三部曲的,哈哈哈。
本文使用到的部分代码放到下面了,回复后再领哦,各位拜拜~。

https://github.com/chencchen/webcrawler/tree/master/%E4%BD%BF%E7%94%A8ast%E5%AF%B9%E6%9F%90v5%E5%8A%A0%E5%AF%86%E8%BF%9B%E8%A1%8C%E8%BF%98%E5%8E%9F2

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血音乐

发表于 2020-5-2 18:14:52 | 显示全部楼层

大佬
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coder

发表于 2020-5-2 20:29:34 | 显示全部楼层

不是说sojson站长会发律师函的吗
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小Gy

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tql
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Jrb

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tql
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Henryhaohao

发表于 2020-5-3 00:25:20 | 显示全部楼层

666
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vip

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tql
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daisixuan

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冲冲冲
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北落师门

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保存点赞收藏一波
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菜鸡中的最菜

发表于 2020-5-3 20:12:35 | 显示全部楼层

666
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