JS逆向：破解 sojson 混淆後的 setInterval 無限反 debugger 策略 1. setInterval 計時器 2. 跟棧分析

1. setInterval 計時器

• setInterval 這個是 JS 語言當中的 定時器，它有兩個參數：第一個是要執行的代碼，第二個執行時間。
• 下方是 sojson 混淆後的一段代碼，其中使用了 setInterval 定時器進行了反 debugger 操作。

/*
 * 加密工具已經升級了一個版本，目前爲 jsjiami.com.v5 ，主要加強了算法，以及防破解【絕對不可逆】配置，耶穌也無法100%還原，我說的。;
 * 已經打算把這個工具基礎功能一直免費下去。還希望支持我。
 * 另外 jsjiami.com.v5 已經強制加入校驗，註釋可以去掉，但是 jsjiami.com.v5 不能去掉（如果你開通了VIP，可以手動去掉），其他都沒有任何綁定。
 * 誓死不會加入任何後門，jsjiami.com JS 加密的使命就是爲了保護你們的Javascript 。
 * 警告：如果您惡意去掉 jsjiami.com.v5 那麼我們將不會保護您的JavaScript代碼。請遵守規則
 * 新版本: https://www.jsjiami.com/ 支持批量加密，支持大文件加密，擁有更多加密。 */

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        _0x10f1d4 += _0x58f172[_0x448a('0x4c', 'ad$x')];
        _0x4b25cc = encode_version;
        if (!(_0x58f172[_0x448a('0x4d', '&EMi')](typeof _0x4b25cc, _0x58f172[_0x448a('0x4e', '09r0')]) && _0x58f172[_0x448a('0x4f', 'nR*P')](_0x4b25cc, _0x58f172[_0x448a('0x50', 'aATf')]))) {
            _0x27deb7[_0x10f1d4](_0x58f172[_0x448a('0x51', '^t^m')]('刪除', _0x58f172[_0x448a('0x52', 'X84F')]));
        }
    } catch (_0x385b4b) {
        if (_0x58f172[_0x448a('0x53', 'ad$x')](_0x58f172[_0x448a('0x54', 'RDOg')], _0x58f172[_0x448a('0x55', '6ZEZ')])) {
            _0x27deb7[_0x10f1d4](_0x58f172[_0x448a('0x56', '&bRm')]);
        } else {
            _0x10f1d4 += _0x58f172[_0x448a('0x57', 'cXYO')];
            _0x4b25cc = encode_version;
            if (!(_0x58f172[_0x448a('0x58', 'RDOg')](typeof _0x4b25cc, _0x58f172[_0x448a('0x59', ']JMS')]) && _0x58f172[_0x448a('0x5a', '!YzN')](_0x4b25cc, _0x58f172[_0x448a('0x5b', '[rBd')]))) {
                _0x27deb7[_0x10f1d4](_0x58f172[_0x448a('0x5c', 'I1W$')]('刪除', _0x58f172[_0x448a('0x5d', 'A8)4')]));
            }
        }
    }
}(window));
function _0x1d04ab(_0x36fc87) {
    var _0x4150c6 = {
        'SXGcI': function _0x35ad87(_0x25767f, _0x5bb2d) {
            return _0x25767f !== _0x5bb2d;
        },
        'pLpDQ': _0x448a('0x5e', 'iLz*'),
        'SWmmg': function _0x2f06cb(_0x2a673d, _0x47ee41) {
            return _0x2a673d(_0x47ee41);
        },
        'xfkyy': function _0x559def(_0x322e72, _0x5f02af) {
            return _0x322e72 === _0x5f02af;
        },
        'tPBoc': _0x448a('0x5f', '6Q1X'),
        'RALMY': function _0x54581f(_0x23d979) {
            return _0x23d979();
        },
        'WTVBK': function _0x5b150f(_0x16e7d9, _0x1d9131) {
            return _0x16e7d9 !== _0x1d9131;
        },
        'PvEVl': function _0x2cf55c(_0x473070, _0x552886) {
            return _0x473070 + _0x552886;
        },
        'pvJhV': function _0x10bd16(_0x451ab7, _0x30bdbc) {
            return _0x451ab7 / _0x30bdbc;
        },
        'mDGVw': _0x448a('0x60', 'ojO6'),
        'UXsoU': function _0x444283(_0xd39c1a, _0x40e634) {
            return _0xd39c1a % _0x40e634;
        },
        'oMots': function _0xd65f8d(_0x31e81b, _0x2c874b) {
            return _0x31e81b === _0x2c874b;
        },
        'WSGSL': _0x448a('0x61', 'mh60'),
        'BCQzw': _0x448a('0x62', '08H@'),
        'DEKML': _0x448a('0x63', '2P[6'),
        'jsFrr': _0x448a('0x64', 'B5I7'),
        'oCiuo': _0x448a('0x65', 'LwSx'),
        'znCFF': function _0x30f2a7(_0xa86eb8, _0x25e5eb) {
            return _0xa86eb8(_0x25e5eb);
        },
        'TIZWv': _0x448a('0x66', '%nP9'),
        'ecovO': _0x448a('0x67', 'Ic)]')
    };
    function _0x4c89c1(_0x182efd) {
        var _0x52571d = {
            'EREjT': function _0x31347f(_0x513a7e, _0x5f46f3) {
                return _0x4150c6[_0x448a('0x68', '%DCh')](_0x513a7e, _0x5f46f3);
            },
            'ETwzv': _0x4150c6[_0x448a('0x69', '6ZEZ')],
            'xTezF': function _0x2dd474(_0x55c77f, _0x3af363) {
                return _0x4150c6[_0x448a('0x6a', 'ojO6')](_0x55c77f, _0x3af363);
            }
        };
        if (_0x4150c6[_0x448a('0x6b', 'B5I7')](typeof _0x182efd, _0x4150c6[_0x448a('0x6c', '5ir0')])) {
            var _0x4a8e69 = function() {
                while (!![]) {
                    if (_0x52571d[_0x448a('0x6d', '2P[6')](_0x52571d[_0x448a('0x6e', ')BG9')], _0x52571d[_0x448a('0x6f', 'A8)4')])) {
                        if (_0x36fc87) {
                            return _0x4c89c1;
                        } else {
                            _0x52571d[_0x448a('0x70', 'aATf')](_0x4c89c1, 0x0);
                        }
                    } else {}
                }
            };
            return _0x4150c6[_0x448a('0x71', 'Pg%P')](_0x4a8e69);
        } else {
            if (_0x4150c6[_0x448a('0x72', ']JMS')](_0x4150c6[_0x448a('0x73', '8!5E')]('', _0x4150c6[_0x448a('0x74', 'RDOg')](_0x182efd, _0x182efd))[_0x4150c6[_0x448a('0x75', '09r0')]], 0x1) || _0x4150c6[_0x448a('0x76', 'HbTy')](_0x4150c6[_0x448a('0x77', '!YzN')](_0x182efd, 0x14), 0x0)) {
                debugger ;
            } else {
                if (_0x4150c6[_0x448a('0x78', '%DCh')](_0x4150c6[_0x448a('0x79', 'iLz*')], _0x4150c6[_0x448a('0x7a', '09r0')])) {
                    debugger ;
                } else {
                    _0x4150c6[_0x448a('0x7b', 'cXYO')](result, '0');
                }
            }
        }
        _0x4150c6[_0x448a('0x7c', 'sid3')](_0x4c89c1, ++_0x182efd);
    }
    try {
        if (_0x4150c6[_0x448a('0x7d', '2P[6')](_0x4150c6[_0x448a('0x7e', '!YzN')], _0x4150c6[_0x448a('0x7f', '%DCh')])) {
            if (_0x36fc87) {
                if (_0x4150c6[_0x448a('0x80', 'sid3')](_0x4150c6[_0x448a('0x81', 'LwSx')], _0x4150c6[_0x448a('0x82', 'I1W$')])) {
                    debugger ;
                } else {
                    return _0x4c89c1;
                }
            } else {
                _0x4150c6[_0x448a('0x83', 'iLz*')](_0x4c89c1, 0x0);
            }
        } else {
            var _0x582c72 = fn[_0x448a('0x33', '!YzN')](context, arguments);
            fn = null;
            return _0x582c72;
        }
    } catch (_0x308942) {
        if (_0x4150c6[_0x448a('0x84', '[rBd')](_0x4150c6[_0x448a('0x85', 'xDIT')], _0x4150c6[_0x448a('0x86', '6ZEZ')])) {} else {
            w[c](_0x4150c6[_0x448a('0x87', '[rBd')]);
        }
    }
}
;encode_version = 'jsjiami.com.v5';

這個一段代碼執行的話會一直斷住，不管你怎麼跳轉到下一個斷點，它都還是會一直斷，其實這個就是一個無限debugger的代碼。

2. 跟棧分析

2.1. conditional breakpoint 跳過 debugger

在分析之前，其實我們並不知道這段代碼使用了定時器，所以我們嘗試手動在 debugger 處打上 conditional breakpoint，我們發現 debugger 被過掉以後，很快又再次被斷掉。根據經驗，我們推測此處使用了定時器。

2.2. 跟棧分析

通過分析調用棧，我們發現 debugger 所在函數 _0x4c89c1 不斷被 _0x1d04ab 函數調用。

在 consloe 中手動將 _0x4c89c1 函數置空，繼續調試。

_0x4c89c1 = function(){}

繼續調試，發現 _0x1d04ab 在 setInterval 中被 _0x2f06cb 函數調用，如下圖所示。

將 _0x2f06cb 函數置空。

_0x2f06cb = function(){}

至此，無限反 debugger 被成功過掉。