U.S. Finance Sector Hit with Targeted Backdoor Campaign

guest · Feb 6, 2020

U.S. Finance Sector Hit with Targeted Backdoor Campaign
The powerful Minebridge backdoor gives cyberattackers full run of a victim’s machine
February 6, 2020
https://threatpost.com/us-finance-sector-targeted-backdoor-campaign/152634/

The financial services sector in the U.S. found itself under a barrage of cyberattacks last month, all bent on delivering a powerful backdoor called Minebridge. The attack chain employed a known method called “VBS Stomping” to avoid detection.

According to researchers at FireEye, the campaigns, aimed at enabling further malware infections and espionage efforts, were initiated via phishing emails with attached documents containing malicious macros. The emails were coming from fake domains that were geared to add legitimacy to the messages, resulting in a convincing theme running throughout the proceedings.

“One of the more notable characteristics of this activity was the consistency in themes used for domain registration, lure content, similarities in malicious document macro content and targeting,” according to the research.
VBA Stomping to Hide Malicious Macros
Across campaigns, the attached phishing documents used the “VBA Stomping” tactic to hide their malicious macros. The term refers to “the manipulation of Office documents where the source code of a macro is made to mismatch the pseudo-code (p-code) of the document,” according to FireEye.
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The Minebridge Payload
The ultimate goal of the document is to infect victims with the Minebridge backdoor. It’s a powerful piece of malware that gives attackers full control of the target environment. Its C2 commands include downloading and executing other malware, downloading arbitrary files, self-deletion and updating, process listing, shutting down and rebooting the system, executing arbitrary shell commands, process elevation, turning on/off TeamViewer’s microphone and gathering system information.
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FireEye: STOMP 2 DIS: Brilliance in the (Visual) Basics

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