Hackers compromised gambling sites to deliver a new remote access trojan (RAT) called BIOPASS that enables watching the victim’s computer screen in real time by abusing popular live-streaming software.
Apart from the unusual feature, which comes on top of the regular functions seen in RATs, the malware can also steal private data from web browsers and instant messaging applications.
Adobe gave up Flash Player at the end of 2020 and blocks running Flash content since January 12, urging users to remove the application due to high-security risks.
Silverlight follows the same path, with Microsoft ending support later this year, on October 12. The framework is currently supported only on Internet Explorer 11 and there are no plans for extending its life.
Security researchers at Trend Micro found that the script retrieving BIOPASS checks if the visitor has been infected and it is typically injected into the target site’s online support chat page.
The threat actor is cautious enough to provide the legitimate installers for Flash Player and Silverlight, the apps being downloaded from the official websites or stored on the attacker’s Alibaba cloud storage.
BIOPASS remote access trojan is stored in the same place, along with the DLL and libraries necessary to run scripts on systems where Python language is not present.
The researchers note that the malware is actively developed and that the loader’s default payload was Cobalt Strike shellcode, not the BIOPASS RAT.
Live screen via open-source software
BIOPASS has all the capabilities typically seen in remote access trojans, like assessing the file system, remote desktop access, file exfiltration, taking screenshots, and shell command execution.
However, it also downloads FFmpeg that is required to record, convert, and stream audio and video, as well as the Open Broadcaster Software, an open-source solution for video recording and live streaming.
The attacker can use either of the two frameworks to monitor an infected system’s desktop and stream the video to the cloud, allowing them to watch the feed in real time by logging into the BIOPASS control panel.
While analyzing the malware, the researchers found a command that enumerates installation folders for multiple messaging applications, WeChat, QQ, and Aliwangwang among them.
BIOPASS also extracts sensitive data – cookies and logins – from several web browsers (Google Chrome, Microsoft Edge Beta, 360 Chrome, QQ Browser, 2345 Explorer, Sogou Explorer, and 360 Safe Browser).
While not implemented in the analyzed version, the researchers found a Python plugin that stole the chat history from the WeChat messenger for Windows.
There is no definite attribution on who is behind BIOPASS RAT but Trend Micro found links pointing to the Chinese Winnti hacker group, also known as APT41.