Researchers at Cisco Talos warn {that a} new phishing marketing campaign is concentrating on customers in Germany and Poland in an try to ship a number of strains of malware, together with a brand new backdoor dubbed “TorNet.”
The phishing emails purport to be pretend cash switch confirmations from monetary establishments or phony order receipts from manufacturing and logistics firms.
“The phishing emails are predominantly written in Polish and German, indicating the actor’s intent to primarily goal customers in these international locations,” the researchers write. “We additionally discovered some phishing e-mail samples from the identical marketing campaign written in English. We assess with medium confidence that the actor is financially motivated, based mostly on the phishing e-mail themes and the filenames of the e-mail attachments. The phishing e-mail has attachments with the file extension ‘.tgz’, indicating that the actor has used GZIP to compress the TAR archive of the malicious attachment file to disguise the precise malicious content material of the attachment and evade e-mail detections.”
The brand new pressure of malware, which Talos calls “TorNet,” is put in by the PureCrypter loader after a consumer opens the attachment.
“When a consumer opens the compressed e-mail attachment and manually unzips it and runs a .NET loader executable, it will definitely downloads encrypted PureCrypter malware from a compromised staging server,” the researchers write.
“The Loader decrypts the PureCrypter malware and runs it within the system reminiscence. In just a few intrusions on this marketing campaign, we discovered that the PureCrypter malware drops and runs the TorNet backdoor. The TorNet backdoor establishes connection to the C2 server and in addition connects the sufferer machine to the TOR community. It has the capabilities to obtain and run arbitrary .NET assemblies within the sufferer machine’s reminiscence, downloaded from the C2 server, growing the assault floor for additional intrusions.”
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Cisco Talos has the story.