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  • Fresh RustBucket malware targets macOS users

    Researchers at Jamf Threat Labs attributed the recently identified malware campaign targeting Apple macOS devices to the BlueNoroff hacker group, a subgroup of notorious North Korean attackers Lazarus. The attacks use the new RustBucket malware, and the infection scheme itself is multi-layered and quite cunning.

    MacOS malware identified by Jamf Threat Labs masquerades as the "Internal PDF Viewer" system application to activate the infection. Although it should be noted that the success of the attack depends entirely on whether the potential victim gives manual permission to execute the malicious script after the Gatekeeper request, as the attackers did not seem to bother with forging the application's signature.

    If all goes well, the script being executed downloads the second stage payload from the remote server. It is written in Objective-C and is a fully functional PDF viewer, but it is used to initiate the next phase of the attack chain after launching a specific malicious PDF document.

    One such nine-page document, identified by Jamf Threat Labs, suggested a "profitable investment strategy", but when it was launched, the aforementioned PDF accessed a C2 server to download and launch a stage three trojan called "Mach-O". It is an executable file written in Rust with the ability to run an extensive list of system intelligence commands.

    The researchers were "impressed" by the methods used by the North Korean attackers in this campaign. They were not even able to determine the starting point of the infection and admitted that for a full analysis they needed not only the second stage malware, but also a certain PDF file that acts as a key for executing the malicious code.

     

    Author DeepWeb
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