An increase in credit and debit card theft via Point of Sale (PoS) malware campaigns over the late 2013 holiday season has resulted in significant media attention and has likely emboldened threat actors as the success of past campaigns comes to light. Media attention has decreased since news of the Target breach and associated fallout, however threat actors targeting PoS systems are still engaged in active attacks.
Point of Sale Malware Overview
Certain malware, such as Dexter, Project Hook, Alina, ChewBacca, JackPoS and VSkimmer have been written specifically to compromise Point of Sale machines. Other malware not designed specifically for PoS attack, such as ever-popular Citadel, has the capability to exfiltrate data from the target organization. In short, any system that contains credit/debit card data in any clear-text form in memory or on disk or sends clear-text card data over the network is potentially at risk regardless of whether that machine is a PoS terminal or not.
In addition to Alina, Chewbacca, JackPoS and other Point of Sale malware, ASERT continues to track the Dexter and Project Hook PoS campaigns we originally reported on in December of 2013. Indicators suggest that Dexter Revelation may have been in existence as early as April 2013. A new ASERT threat intelligence brief sited at the end of this post provides a significant amount of updated material about Dexter and Project Hook including:
- Additional actor insight
- Reverse Engineering information
- Potentially vulnerable Point of Sale solutions
- An extensive list of file and network indicators
- An analysis of possible attack vectors
- An updated infection map
- Mitigation suggestions
This information should prove valuable for incident responders and those responsible for protecting cardholder data environments. Additionally, since many of the network and file indicators have not been previously released, these indicators may be useful for identifying environments that are already compromised. The brief also provides scripts for decoding dump files that may help incident responders determine the scope of a compromise.
The following map shows Dexter and Project Hook infections as of January 24, 2014:
Continued PoS campaign activity suggests that organizations still need to be vigilant. This new ASERT intelligence brief will help. The full document is available here.
*Author credits: Curt Wilson, Dave Loftus, and Dennis Schwarz