Hackers injected malicious skimming scripts into online stores payment checkout pages to scrape the credit card information and personal details of users.
There are 201 online campus stores present in the United States and Canada are impacted by the attack. Further analysis revealed that attackers compromised PrismWeb platform that used for designing college stores.
The stolen information form checkout pages are sent to a remote server and the amount of payment stolen remain unknown. PrismRBS learned the attack on April 26, 2019.
“PrismRBS became aware that an unauthorized third-party obtained access to some of our customers’ e-commerce websites that PrismRBS hosts. We are proactively notifying potentially impacted customers to let them know about the incident.”
TrendMicro named this attack as Mirrorthief and it shares the characteristics of Magecart Skimming Attack.
Attackers injected a fake Google Analytics script, but it is the skimming script that steals the payment card and personal details.
“The skimmer that the Mirrorthief group used was designed specifically for PrismWeb’s payment page. The skimmer collects data only from HTML elements with the specific IDs on PrismWeb’s payment form.”
| HTML Element ID | Mirrorthief JSON Data Schema | Information |
| _cc_number | aa | Credit card number |
| _cc_expmonth | bb | Credit card expiration month |
| _cc_expyear | cc | Credit card expiration year |
| cc_type | dd | Credit card type |
| _cc_cvn | ee | Credit card CVN number |
| cc_first_name | ff | First name of cardholder |
| cc_last_name | gg | Last name of cardholder |
| bill_to_phone | hh | Phone number for billing |
| bill_to_country | ii | Billing address (country) |
| bill_to_state | jj | Billing address (state) |
| bill_to_street1 | kk | Billing address (street) |
| bill_to_street2 | ll | Billing address (street) |
| bill_to_city | mm | Billing address (city) |
| bill_to_zip | nn | Billing address (zip code) |
The skimmer stoles the following information that includes, card number, expiry date, card type, card verification number (CVN), cardholder’s name and personal details.
Once the user enters the payment card information and personal details in the checkout page and clicks on the payment review, then the skimmer copies the data encrypted with AES encryption and Base64 encoding. Then the data will be sent to the attacker’s server by creating an HTML image element.
“When we checked Mirrorthief’s network infrastructure, we found that it did not have any overlap with any known cybercrime groups. In addition, the skimmer Mirrorthief used in the attack is very different from the others since it’s specially designed to skim PrismWeb’s payment form,” TrendMicro said.
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