There are many ways to threaten others through online messenger applications (such as WeChat, WhatsApp, Telegram, etc.). The following are some common methods and their prevention recommendations.： --- ###**1. Technical attacks** 1. **Malicious file transfer** -**Means**: Send files (such as documents, pictures, compressed packages) that carry viruses, ransom software, or spyware to induce the other party to steal data or control equipment after downloading. -**Prevention**: Avoid opening files of unknown origin and scan them with anti-virus software. 2. **Man-in-the-middle attack (MITM)** -**Means**: Steal chat records, login credentials, or sensitive information by listening to unencrypted communications. -**Prevention**: Use end-to-end encrypted communication tools to avoid connecting to public WiFi to transmit sensitive information. 3. **Phishing attacks (non-linked form)** -**Means**: Impersonate customer service, relatives, friends or authorities, and induce users to provide passwords, verification codes or transfers through text or voice. -**Prevention**: Verify the identity of the other party and be vigilant for “emergency help” information. --- ###**2. Psychological manipulation and harassment** 1. **Pretend to be an identity** -**Means**: Falsify other people's account numbers (such as avatars, nicknames, impersonating relatives, friends or leaders), and defraud by borrowing money, threatening or stealing privacy. -**Prevention**: Confirm your identity through other channels (such as telephone) and enable two-factor authentication. 2. **Emotional blackmail** -**Means**: Threaten to disclose private chat records, photos or videos (such as “sexual blackmail”) to force the victim to compromise. -**Prevention**: Do not send private content to strangers, keep evidence and call the police when threatened. 3. **Continuous harassment** -**Means**: Psychological pressure is caused by screen swiping, verbal abuse, threatening messages or voice bombing. -**Prevention**: Black out harassers，