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Y4tackerY4tacker
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Create demo LicenceCrack
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‎6.JavaAgent/LicenceCrack/.idea/.gitignore‎

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‎6.JavaAgent/LicenceCrack/.idea/compiler.xml‎

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‎6.JavaAgent/LicenceCrack/.idea/inspectionProfiles/Project_Default.xml‎

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‎6.JavaAgent/LicenceCrack/.idea/jarRepositories.xml‎

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‎6.JavaAgent/LicenceCrack/.idea/libraries/BuyFlag.xml‎

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‎6.JavaAgent/LicenceCrack/.idea/libraries/BuyFlag__2_.xml‎

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‎6.JavaAgent/LicenceCrack/.idea/libraries/BuyFlag__3_.xml‎

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‎6.JavaAgent/LicenceCrack/.idea/misc.xml‎

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‎6.JavaAgent/LicenceCrack/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>org.example</groupId>
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<artifactId>LicenceCrack</artifactId>
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<version>1.0-SNAPSHOT</version>
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<packaging>jar</packaging>
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<properties>
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<maven.compiler.source>8</maven.compiler.source>
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<maven.compiler.target>8</maven.compiler.target>
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</properties>
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<dependencies>
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<dependency>
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<groupId>com.sunn</groupId>
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<artifactId>tools</artifactId>
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<version>1.8.0</version>
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<scope>system</scope>
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<systemPath>D:/JDKV/jdk8u301/lib/tools.jar</systemPath>
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</dependency>
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<dependency>
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<groupId>org.javassist</groupId>
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<artifactId>javassist</artifactId>
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<version>3.21.0-GA</version>
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</dependency>
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</dependencies>
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<build>
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<pluginManagement>
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<plugins>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-jar-plugin</artifactId>
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<version>2.2</version>
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<configuration>
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<archive>
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<manifestEntries>
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<!--改这个为代理类-->
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<Main-Class>MyAgent</Main-Class>
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<Agent-Class>MyAgent</Agent-Class>
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<Can-Redefine-Classes>true</Can-Redefine-Classes>
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<Can-Retransform-Classes>true</Can-Retransform-Classes>
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</manifestEntries>
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</archive>
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<skip>true</skip>
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</configuration>
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</plugin>
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</plugins>
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</pluginManagement>
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</build>
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</project>

‎6.JavaAgent/LicenceCrack/src/main/java/CrackLicenseTest.java‎

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import java.text.ParseException;
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import java.text.SimpleDateFormat;
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import java.util.Date;
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import java.util.concurrent.TimeUnit;
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public class CrackLicenseTest {
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private static final SimpleDateFormat DATE_FORMAT = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
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private static boolean checkExpiry(String expireDate) {
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try {
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Date date = DATE_FORMAT.parse(expireDate);
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if (new Date().before(date)) {
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return false;
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}
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} catch (ParseException e) {
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e.printStackTrace();
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}
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return true;
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}
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public static void main(String[] args) {
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final String expireDate = "2020-10-01 00:00:00";
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new Thread(new Runnable() {
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@Override
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public void run() {
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while (true) {
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try {
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String time = "[" + DATE_FORMAT.format(new Date()) + "] ";
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if (checkExpiry(expireDate)) {
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System.err.println(time + "Your license has expired, please purchase a new license!");
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} else {
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System.out.println(time + "Your authorization is normal and the deadline is:" + expireDate);
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System.out.println("Cracked successfully:flag{jvavAg1ent1sVe@r1zy}");
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}
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TimeUnit.SECONDS.sleep(5);
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} catch (InterruptedException e) {
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e.printStackTrace();
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}
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}
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}
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}).start();
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}
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}

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