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‘Raspberry Robin’ Home windows Worm Abuses QNAP Gadgets

By Ionut Arghire on July 11, 2022

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A not too long ago found Home windows worm is abusing compromised QNAP network-attached storage (NAS) units as stagers to unfold to new programs, in line with Cybereason.

Dubbed Raspberry Robin, the malware was initially noticed in September 2021, spreading primarily by way of detachable units, equivalent to USB drives.

In a Might 2022 report, Crimson Canary famous that the malware primarily depends on msiexec.exe – the authentic executable program of the Home windows Installer – to speak with its infrastructure, utilizing HTTP requests. It additionally makes use of Tor exit notes for command and management (C&C).

Raspberry Robin was noticed primarily in organizations associated to the know-how and manufacturing sectors, however Crimson Canary safety researchers couldn’t establish different hyperlinks among the many victims and stated that the aim of the assaults remained unsure.

In a brand new technical report on Raspberry Robin’s an infection course of, Cybereason researchers famous that the malware additionally spreads by way of file archives and ISO recordsdata, along with USB drives.

The an infection course of begins with two recordsdata in the identical listing, particularly a LNK shortcut containing a Home windows shell command, and a BAT file. On the first stage, msiexec.exe is named to fetch a malicious DLL from a compromised QNAP NAS system.

The malware injects itself into three authentic Home windows system processes operating on the sufferer system, particularly rundll32.exe, dllhost.exe and regsvr32.exe.

For persistence, Raspberry Robin creates a registry key, guaranteeing that the identical DLL downloaded from the exterior useful resource is injected into rundll32.exe when the system begins, after which the method injection stage begins.

“Because the malicious module is identical one as through the preliminary an infection course of, it shows the identical malicious actions involving course of injection and communication with Tor exit nodes,” Cybereason notes.

The researchers recognized different Raspberry Robin samples as properly, together with one the place the module is signed – utilizing the OmniContact code signing identify – however shouldn’t be verified by the Home windows platform. In roughly 75% of the noticed incidents, the malware was signed by OmniContact, the researchers say.

In keeping with Crimson Canary, one of many questions that continues to be unanswered is how Raspberry Robin infects the USB drives to unfold to new programs. Moreover, with out info on later-stage exercise, the corporate couldn’t establish the objective of the assaults.

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