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javascript

两段奇怪的JS

發布時間：2023/12/20 javascript 32 豆豆

生活随笔收集整理的這篇文章主要介紹了两段奇怪的JS 小編覺得挺不錯的,現在分享給大家,幫大家做個參考.

起因

昨天晚上有一臺機器拉取合作方接口時,沒有正常返回數據,返回了一段奇怪的html,里面是一段不完整的js代碼

隨后進行了解析,經過搜索和嘗試運行,神奇的得到了第二段更長的js代碼

更奇怪的是,過了一晚上之后,接口不再復現這個行為,不過代碼還是保存了下來,發給大家看看

查詢關鍵變量后發現這些代碼分布時間和空間都較廣泛但沒有具體的解釋,雖然搜索結果不多,但是猜測分布數量應該很大

所以留下這個文章方便后人討論和搜索

如果有人知道這些代碼從何而來/是何用途歡迎留言為后人解惑

先說結論

善意的猜測:

是根據cookies進行的某些判斷和篩選,可能來自vps服務提供商?(如阿里?)

用途可能是反爬蟲?

惡意的猜測:

都能在你頁面里加代碼了,還有什么他不能干的?

接口返回的原始異常數據

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經過解碼的第一段腳本

去除html標簽,以及簡單的解碼之后獲得:

var arg1 = '32947CDC0BAF2D68D17283179D6475ACCBCCE930'; var parameter13 = ["wqImMT0tw6RNw5k=", "DMKcU0JmUwUv", "VjHDlMOHVcONX3fDicKJHQ==", "wqhBH8Knw4TDhSDDgMOdwrjCncOWwphhN8KCGcKqw6dHAU5+wrg2JcKaw4IEJcOcwrRJwoZ0wqF9YgAV", "dzd2w5bDm3jDpsK3wpY=", "w4PDgcKXwo3CkcKLwr5qwrY=", "wrJOTcOQWMOg", "wqTDvcOjw447wr4=", "w5XDqsKhMF1/", "wrAyHsOfwppc", "J3dVPcOxLg==", "wrdHw7p9Zw==", "w4rDo8KmNEw=", "IMKAUkBt", "w6bDrcKQwpVHwpNQwqU=", "d8OsWhAUw7YzwrU=", "wqnCksOeezrDhw==", "UsKnIMKWV8K/", "w4zDocK8NUZv", "c8OxZhAJw6skwqJj", "PcKIw4nCkkVb", "KHgodMO2VQ==", "wpsmwqvDnGFq", "wqLDt8Okw4c=", "w7w1w4PCpsO4wqA=", "wq9FRsOqWMOq", "byBhw7rDm34=", "LHg+S8OtTw==", "wqhOw715dsOH", "U8O7VsO0wqvDvcKuKsOqX8Kr", "Yittw5DDnWnDrA==", "YMKIwqUUfgIk", "aB7DlMODTQ==", "wpfDh8Orw6kk", "w7vCqMOrY8KAVk5OwpnCu8OaXsKZP3DClcKyw6HDrQ==", "wow+w6vDmHpsw7Rtwo98LC7CiG7CksORT8KlW8O5wr3Di8OTHsODeHjDmcKlJsKqVA==", "NwV+", "w7HDrcKtwpJawpZb", "wpQswqvDiHpuw6I=", "YMKUwqMJZQ==", "KH1VKcOqKsK1", "fQ5sFUkkwpI=", "wrvCrcOBR8Kk", "M3w0fQ==", "w6xXwqPDvMOFwo5d", "csKHwqMI", "ZsKJwr8VeAsy", "UcKiN8O/wplwMA==", "JR8CTg==", "YsOnbSEQw7ozwqZKesKUw7kwX8ORIQ==", "w7oVS8OSwoPCl3jChMKhw6HDlsKXw4s/YsOG", "fwVmI1AtwplaY8Otw5cNfSgpw6M=", "OcONwrjCqsKxTGTChsOjEWE8PcOcJ8K6", "U8K5LcOtwpV0EMOkw47DrMOX", "HMO2woHCiMK9SlXClcOoC1k=", "asKIwqMDdgMuPsOKBMKcwrrCtkLDrMKBw64d"]function setCookie(name, value) {var expiredate = new Date();expiredate.setTime(expiredate.getTime() + (3600 * 1000));document.cookie = name + "=" + value + ";expires=" + expiredate.toGMTString() + ";max-age=3600;path=/"; } function reload(x) {setCookie("acw_sc__v2", x);document.location.reload(); }復制代碼

一段cookies相關的代碼但是并不完整,定義了函數和變量,但沒有執行

不知道怎么獲取到的第二段腳本

隨后,我將這段代碼放在隨手打開的微博里嘗試運行和調試,過了一段時間突然發現被debug中斷,通過阻止debug中斷,得到了第二段更長的代碼,這段代碼運行在一個匿名作用域(vm)中,經過檢查,不是微博自帶的腳本.

經過簡單的解碼,變量名和函數名都是奇幻的_0x編碼這里放上解碼后簡單替換了部分函數名和變量名的代碼

如果有人知道他們是從何而來/具體用途,能否解惑?

總結

以上是生活随笔為你收集整理的两段奇怪的JS的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。

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