Another day, another RAT is sniffing its way into systems of hackers’ interest. This time the trojan called Nerbian RAT is in the limelight, leveraging Covid-19 and World’s Health Organization lures to proceed with targeted attacks against users in Italy, Spain, and the UK. The newly-discovered threat is written in Go, making the malware OS-agnostic and able to target both Windows and Linux users.
Detect the possible scheduled task creation of ‘Nerbian’ with a SIgma-based rule developed by seasoned Threat Bounty Program detection engineer Kyaw Pyiyt Htet:
The detection is available for the 23 SIEM, EDR & XDR platforms, aligned with the latest MITRE ATT&CK® framework v.10, addressing the Execution tactic with Scheduled Task/Job (T1053, T1053.005) as the main technique.
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According to the in-depth inquiry by Proofpoint, Nerbian remote access Trojan is a novel, sophisticated malware powered by impressive evasive capabilities. The Trojan is written in the Go programming language and uses various open-source Go libraries to conduct malicious actions. Such a trick makes Nerbian a multi-purpose tool able to target all major operating systems. In addition to cross-OS and anti-analysis capabilities, the RAT supports a plea of other malicious functions such as keylogging, screen capturing, and SSL-based C2 communications.
In this campaign, Nerbian RAT’s operators mimic the World Health Organization (WHO), sending out bogus alerts regarding COVID-19-related self-isolation procedures. The emails distributed in this spam campaign contain a Microsoft Word document with macros. When enabled, it fetches a 64-bit Nerbian RAT’s dropper.
The security analyst first detected the email-borne malware campaign in late April 2022. Currently, the volume of the campaign distributing Nerbian RAT malware is considered rather insignificant; however, the analysts from Proofpoint warn that the strain is technically sophisticated and possesses ample malicious potential. So all evidence to Nerbian RAT has already gotten off to a good start in this short time.
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