USPS Text Scammers Duped His Wife, So He Hacked Their Operation

Submitted on behalf of mrpg:

https://www.wired.com/story/usps-scam-text-smishing-triad/

The flood of text messages started arriving early this year. They carried a similar thrust: The United States Postal Service is trying to deliver a parcel but needs more details, including your credit card number. All the messages pointed to websites where the information could be entered.

Like thousands of others, security researcher Grant Smith got a USPS package message. Many of his friends had received similar texts. A couple of days earlier, he says, his wife called him and said she'd inadvertently entered her credit card details. With little going on after the holidays, Smith began a mission: Hunt down the scammers.

Over the course of a few weeks, Smith tracked down the Chinese-language group behind the mass-smishing campaign, hacked into their systems, collected evidence of their activities, and started a months-long process of gathering victim data and handing it to USPS investigators and a US bank, allowing people's cards to be protected from fraudulent activity.

In total, people entered 438,669 unique credit cards into 1,133 domains used by the scammers, says Smith, a red team engineer and the founder of offensive cybersecurity firm Phantom Security. Many people entered multiple cards each, he says. More than 50,000 email addresses were logged, including hundreds of university email addresses and 20 military or government email domains. The victims were spread across the United States-California, the state with the most, had 141,000 entries-with more than 1.2 million pieces of information being entered in total.

[...] Chasing down the group didn't take long. Smith started investigating the smishing text message he received by the dodgy domain and intercepting traffic from the website. A path traversal vulnerability, coupled with a SQL injection, he says, allowed him to grab files from the website's server and read data from the database being used.

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