Java-Based Multi-platform Backdoor Targeting Windows, Mac & Linux Computers

Java-Based  Multi-platform Backdoor Targeting Windows, Mac & Linux Computers 

Security researcher at Kaspersky Lab have revealed a new java-based web vulnerability which is targeting Windows, Linux & Mac computers while installing backdoor. Mainly the whole thing is a Web-based social engineering attack that relies on malicious Java applets. According to security researchers from antivirus vendors F-Secure - the attack was detected on a compromised website in Colombia. When users visit the site, they are prompted to run a Java applet that hasn't been signed by a trusted certificate authority.

If allowed to run, the applet checks which operating system is running on the user's computer -- Windows, Mac OS X or Linux -- and drops a malicious binary file for the corresponding platform.

The JAR file checks if the user's machine is running in Windows, Mac or Linux then downloads the appropriate files for the platform. All three files for the three different platforms behave the same way. They all connect to 186.87.69.249 to get additional code to execute. The ports are 8080, 8081, and 8082 for OSX, Linux, and Windows respectively.
The files are detected as:
Trojan-Downloader:Java/GetShell.A (sha1: 4a52bb43ff4ae19816e1b97453835da3565387b7)
Backdoor:OSX/GetShell.A (sha1: b05b11bc8520e73a9d62a3dc1d5854d3b4a52cef)
Backdoor:Linux/GetShell.A (sha1: 359a996b841bc02d339279d29112fe980637bf88)
Backdoor:W32/GetShell.A (sha1: 26fcc7d3106ab231ba0ed2cba34b7611dcf5fc0a)



However, since F-Secure researchers began monitoring the attack, the remote control server hasn't pushed any additional code. It appears that the attack uses the Social Engineer Toolkit (SET), a publicly available tool designed for penetration testers, Aquino said Tuesday via email. However, the chances of this being a penetration test sanctioned by the website's owner are relatively low.
Kaspersky's researchers are in the process of analyzing the backdoor-type malware downloaded by the malicious shell code on Windows and Linux. "The Win32 backdoor is large, about 600KB; the Linux backdoor is over 1MB in size, both appear to contact very complex code which communicates encrypted with other servers."


-Source (CW & F-Secure) 






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