The financially motivated risk actor often known as FIN6 has been noticed leveraging pretend resumes hosted on Amazon Net Companies (AWS) infrastructure to ship a malware household known as More_eggs.
“By posing as job seekers and initiating conversations by way of platforms like LinkedIn and Certainly, the group builds rapport with recruiters earlier than delivering phishing messages that result in malware,” the DomainTools Investigations (DTI) workforce stated in a report shared with The Hacker Information.
More_eggs is the work of one other cybercrime group known as Golden Chickens (aka Venom Spider), which was most not too long ago attributed to new malware households like TerraStealerV2 and TerraLogger. A JavaScript-based backdoor, it is able to enabling credential theft, system entry, and follow-on assaults, together with ransomware.
One of many malware’s identified prospects is FIN6 (aka Camouflage Tempest, Gold Franklin, ITG08, Skeleton Spider, and TA4557), an e-crime crew that initially focused point-of-sale (PoS) techniques within the hospitality and retail sectors to steal cost card particulars and revenue off them. It is operational since 2012.
The hacking group additionally has a historical past of utilizing Magecart JavaScript skimmers to focus on e-commerce websites to reap monetary data.
Based on cost card companies firm Visa, FIN6 has leveraged More_eggs as a first-stage payload way back to 2018 to infiltrate a number of e-commerce retailers and inject malicious JavaScript code into the checkout pages with the last word objective of stealing card knowledge.
“Stolen cost card knowledge is later monetized by the group, bought to intermediaries, or bought overtly on marketplaces comparable to JokerStash, previous to it shutting down in early 2021,” Secureworks notes in a profile of the risk actor.
The most recent exercise from FIN6 entails the usage of social engineering to provoke contact with recruiters on skilled job platforms like LinkedIn and Certainly, posing as job seekers to distribute a hyperlink (e.g., bobbyweisman[.]com, ryanberardi[.]com) that purports to host their resume.
DomainTools stated the bogus domains, which masquerade as private portfolios, are registered anonymously by way of GoDaddy for an additional layer of obfuscation that makes attribution and takedown efforts harder.
“By exploiting GoDaddy’s area privateness companies, FIN6 additional shields the true registrant particulars from public view and takedown workforce,” the corporate stated. “Though GoDaddy is a good and broadly used area registrar, its built-in privateness options make it straightforward for risk actors to cover their identities.”
One other noteworthy facet is the usage of trusted cloud companies, comparable to AWS Elastic Compute Cloud (EC2) or S3, to host phishing websites. What’s extra, the websites include built-in site visitors filtering logic to make sure that solely potential victims are served a hyperlink to obtain the supposed resume after finishing a CAPTCHA examine.
“Solely customers showing to be on residential IP addresses and utilizing frequent Home windows-based browsers are allowed to obtain the malicious doc,” DomainTools stated. “If the customer originates from a identified VPN service, cloud infrastructure like AWS, or company safety scanners, the positioning as a substitute delivers a innocent plain-text model of the resume.”
The downloaded resume takes the type of a ZIP archive that, when opened, triggers an an infection sequence to deploy the More_eggs malware.
“FIN6’s Skeleton Spider marketing campaign reveals how efficient low-complexity phishing campaigns may be when paired with cloud infrastructure and superior evasion,” the researchers concluded. “By utilizing real looking job lures, bypassing scanners, and hiding malware behind CAPTCHA partitions, they keep forward of many detection instruments.”
