Attackers targeted the major US retailer via a phishing campaign on one of its third-party vendors. The vendor downloaded a file containing a virus which was designed to collect all of the data entered within the system. From here the attackers were able to obtain the vendor's login credentials to the retailer's systems.
With these stolen credentials the attackers gained access to the retailer's system and were able to move about freely within the network unnoticed over a two week period. Whilst there they installed malware to attack the POS system enabling them to enter the system again and again to steal information about the 110 million people who shopped at the retailer in late December 2013.
Target's CEO resigned as a result of the breach and the associated financial costs reportedly exceeded USD$300 million.
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