Hackers Deploy “SUBMARINE” Backdoor in Barracuda Email Security Gateway Attacks

The U.S. Cybersecurity and Infrastructure Security Company (CISA) on Friday disclosed facts of a “novel persistent backdoor” named SUBMARINE deployed by danger actors in relationship with the hack on Barracuda Email Security Gateway (ESG) appliances.

“SUBMARINE contains a number of artifacts — which includes a SQL set off, shell scripts, and a loaded library for a Linux daemon — that jointly help execution with root privileges, persistence, command and regulate, and cleanup,” the company explained.

The conclusions occur from an investigation of malware samples obtained from an unnamed firm that had been compromised by threat actors exploiting a critical flaw in ESG devices, CVE-2023-2868 (CVSS score: 9.8), which makes it possible for for remote command injection.

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Evidence gathered so significantly displays that the attackers behind the activity, a suspected China nexus-actor tracked by Mandiant as UNC4841, leveraged the flaw as a zero-working day in Oct 2022 to attain first accessibility to victim environments and implanted backdoors to create and retain persistence.

To that end, the an infection chain associated sending phishing emails with booby-trapped TAR file attachments to set off exploitation, main to the deployment of a reverse shell payload to create communication with the danger actor’s command-and-management (C2) server, from wherever a passive backdoor acknowledged as SEASPY is downloaded for executing arbitrary instructions on the machine.

SUBMARINE, also codenamed DEPTHCHARGE by the Google-owned danger intelligence agency, is the most current malware relatives to be learned in connection with the operation, which resides in a Structured Query Language (SQL) database on the ESG appliance.

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It is believed to have been “deployed in reaction to remediation efforts,” echoing Mandiant’s characterization of the adversary as an aggressive actor capable of promptly altering their malware and employing added persistence mechanisms in an try to sustain their access.

The agency further more mentioned it “analyzed artifacts associated to SUBMARINE that contained the contents of the compromised SQL databases,” and that it “poses a serious danger for lateral movement.”

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