Cảnh báo chiêu lừa sau những cuộc gọi nháy máy | VTV24

Key Concepts:

• Nháy máy (Missed Calls): A common tactic used by scammers to entice victims to call back.
• Định danh VNID mức hai (VNID Level 2 Identification): A digital identification process, often used as a pretext for scams.
• Chifet voice / Giọng nói giả lập (Fake Voice / AI-generated Voice): Technology that uses AI to mimic a person's voice with high accuracy.
• Thao túng tâm lý (Psychological Manipulation): Scammers using specific scripts to elicit certain responses from victims.
• Xác định tài khoản ngân hàng bằng giọng nói (Voice Biometrics for Bank Account Verification): A legitimate security feature that scammers exploit.

Summary:

1. The "Missed Call" Scam Tactic

Recent times have seen a surge in individuals receiving calls from unfamiliar numbers, often starting with prefixes like 024, 028, and 059. These calls typically last only a few seconds, just long enough to register as a missed call before disconnecting. The intention is to provoke the recipient into calling back.

2. Exploiting the Callback: The Rise of AI-Generated Voices

When users return these missed calls, scammers can record their voices. With as little as 3 to 10 seconds of audio, AI technology can generate a synthetic voice with up to 95% accuracy, replicating not only the sound but also the intonation and speaking habits of the victim. This technology is referred to as "chifet voice" or "giọng nói giả lập."

3. Sophisticated Scams Enabled by Fake Voices

This voice mimicry enables more sophisticated scams. Scammers employ psychological manipulation tactics, using scripts designed to elicit specific responses like "yes" (dạ có, ừ dạ có) or "no" (dạ không, ừ dạ không), or confirmations like "that's right" (đúng rồi). These key words are then recorded and used for fraudulent activities.

• Example: Scammers might use the recorded voice to impersonate the victim and request money from their friends or family, or to take out loans in their name.
• Exploiting Bank Security: A common scenario involves scammers pretending to be bank representatives. When a victim confirms their identity or details with a "yes" or "no," the scammer uses the recorded voice to bypass voice biometric authentication systems used by banks. The bank, believing it's the legitimate customer's voice, proceeds with transactions.

4. Recommendations from Ho Chi Minh City Police

The Ho Chi Minh City Police Department has issued a warning to the public:

• Be Wary of Suspicious Calls: Exercise caution with phone numbers displaying a "+" sign or those that only ring for a few seconds before disconnecting.
• Do Not Call Back: Absolutely do not call back these numbers to avoid falling into a scam trap.
• Block and Report: If you are repeatedly harassed by these numbers, block them and report them to your mobile network operator.
• Protect Personal Information: Proactively safeguard your personal data. Do not provide sensitive information over the phone.
• Avoid Suspicious Links and Apps: Do not click on strange links or download applications from unknown sources.

5. Logical Connections and Key Arguments

The core argument presented is that a simple "missed call" tactic, when combined with advanced AI voice cloning technology, can lead to highly convincing and dangerous scams. The transcript highlights a progression: initial contact (missed call) -> victim engagement (callback) -> data acquisition (voice recording) -> exploitation (fake voice for fraud). The police recommendations directly address each stage of this scam to mitigate its impact.

6. Data and Statistics

• AI can achieve up to 95% accuracy in voice simulation with just 3 to 10 seconds of sample audio.

7. Conclusion

The video emphasizes the evolving nature of scams, moving beyond simple phishing to sophisticated voice manipulation. The key takeaway is the critical importance of vigilance, the refusal to engage with suspicious calls, and the proactive protection of personal information to prevent falling victim to these AI-powered fraudulent schemes.