1. Fault Overview

On March 30, 2026, a comprehensive security inspection and emergency response handling was conducted on the server. This maintenance primarily focused on Weipan (Micro Disk), Micro Trading System, and ThinkPHP backdoor for special investigation and remediation.

2. Weipan System Security Maintenance

2.1 System Introduction

Weipan system is a common type of financial trading website system, mainly providing financial services such as small-value transactions and contract for difference (CFD). Due to its involvement in capital transactions, it is a key target for hacker attacks.

2.2 Common Security Vulnerabilities

– Weak password vulnerability

– SQL injection vulnerability

– File upload vulnerability

– Unauthorized access vulnerability

– Payment interface vulnerability

2.3 Remediation Measures

– Update all administrator account passwords to strong passwords (16 characters or more)

– Restrict backend login IP addresses

– Enable login failure lockout

– Update system to the latest secure version

– Deploy Web Application Firewall (WAF)

3. Micro Trading System Security Hardening

3.1 System Characteristics

Micro trading systems are typically developed using PHP frameworks such as ThinkPHP and Laravel, featuring rapid deployment and easy operation. However, they are also high-risk areas for SQL injection and remote code execution.

3.2 Hardening Plan

1. Hide ThinkPHP version number

2. Disable debug mode

3. Configure security filtering rules

4. Restrict file upload types

5. Enable HTTPS encrypted transmission

4. ThinkPHP Backdoor Special Investigation

4.1 Backdoor Feature Identification

ThinkPHP backdoors typically exhibit the following characteristics:

– Abnormal external network connections

– Suspicious PHP files

– Abnormal administrator accounts

– Abnormal website traffic

– Unusually increased server load

4.2 Investigation Tools and Methods

– Use webshell detection tools such as D盾 (D盾) and 河马 (Hemav) to scan

– Check recently modified files

– Analyze abnormal requests in access logs

– Check system processes and network connections

– Check scheduled tasks and startup items

4.3 Cleanup and Defense

1. Isolate the compromised server

2. Remove malicious files

3. Fix vulnerability entry points

4. Change all passwords

5. Strengthen monitoring and alerting

5. Server Security Configuration Recommendations

SSH Security:

– Disable password login and use key authentication

– Change the default SSH port

Firewall:

– Only open necessary ports

Backup:

– Establish regular automatic backup mechanism

Monitoring:

– Deploy server monitoring system

Updates:

– Regularly update system and software patches

6. Summary

This security maintenance conducted a comprehensive inspection on the Weipan and Micro Trading systems, successfully investigating and remediating ThinkPHP backdoor vulnerabilities. It is recommended to establish a regular security inspection mechanism to ensure continuous safe operation of the system.

For professional security services or system building technical support, welcome to contact our professional technical team.