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Story summary
- Calif, a U.S. security firm, built a WeChat-exploiting hacking tool in just over a week.
- The tool enables attackers to hijack phone numbers, read private messages, and contact saved contacts.
- Within hours, the exploit compromised millions of users worldwide.
- Chief executive Thai Duong called the bug exceptional and a hacker’s dream.
- Calif says it creates hacking tools to strengthen cyberdefense, not to sell them.
