Business

News

 
More...

Alerts

 
More...

Events

 
More...
 
     
 

Backoff Point-of-Sale Malware

 

Systems Affected


• Point-of-Sale Systems

Threat Level


High


Overview


This advisory was prepared in collaboration with the National Cybersecurity and Communications Integration Center (NCCIC), United States Secret Service (USSS), Financial Sector Information Sharing and Analysis Center (FS-ISAC), and Trustwave Spiderlabs, a trusted partner under contract with the USSS. The purpose of this release is to provide relevant and actionable technical indicators for network defense.

Recent investigations revealed that malicious actors are using publicly available tools to locate businesses that use remote desktop applications. Remote desktop solutions like Microsoft's Remote Desktop [1] Apple Remote Desktop,[2] Chrome Remote Desktop,[3] Splashtop 2,[4] Pulseway[5], and LogMeIn[6] offer the convenience and efficiency of connecting to a computer from a remote location. Once these applications are located, the suspects attempted to brute force the login feature of the remote desktop solution. After gaining access to what was often administrator or privileged access accounts, the suspects were then able to deploy the point-of-sale (PoS) malware and subsequently exfiltrate consumer payment data via an encrypted POST request.

USSS, NCCIC/US-CERT and Trustwave Spiderlabs have been working together to characterize newly identified malware dubbed "Backoff", associated with several PoS data breach investigations. At the time of discovery and analysis, the malware variants had low to zero percent anti-virus detection rates, which means that fully updated anti-virus engines on fully patched computers could not identify the malware as malicious.

Similar attacks have been noted in previous PoS malware campaigns [7] and some studies state that targeting the Remote Desktop Protocol with brute force attacks is on the rise.[8] A Mitigation and Prevention Strategies section is included to offer options for network defenders to consider.


Description


Injecting malicious stub into explorer.exe

The malicious stub that is injected into explorer.exe is responsible for persistence in the event the malicious executable crashes or is forcefully stopped. The malware is responsible for scraping memory from running processes on the victim machine and searching for track data. Keylogging functionality is also present in most recent variants of “Backoff”. Additionally, the malware has a C2 component that is responsible for uploading discovered data, updating the malware, downloading/executing further malware, and uninstalling the malware.

Variants

Based on compiled timestamps and versioning information witnessed in the C2 HTTP POST requests, “Backoff” variants were analyzed over a seven month period. The five variants witnessed in the “Backoff” malware family have notable modifications, to include:


Impact



Solution/ Workarounds


  ✻  Update the latest version of the Mozilla's Firefox on Windows, Linux and Mac.


References


https://www.us-cert.gov/ncas/alerts/TA14-212A


Disclaimer


The information provided herein is on "as is" basis, without warranty of any kind.


 
     

© Copyright Sri Lanka CERT|CC. All Rights Reserved.