An Iran-linked advanced persistent threat (APT) group dubbed OilRig has used a fake Juniper Networks VPN portal and fake University of Oxford websites to deliver malware to victims.
OilRig has been around since at least 2015 and its campaigns have been analyzed by several researchers, including from FireEye and Palo Alto Networks. The attackers have targeted organizations in Saudi Arabia, Israel, the United States, Turkey, the United Arab Emirates, Lebanon, Kuwait and Qatar, including government agencies, financial institutions and tech companies.
Recent attacks observed by researchers at ClearSky have been aimed at several Israeli organizations, including IT vendors, financial institutions and the country’s national postal service.
In some of the attacks seen by ClearSky, the threat actor set up a fake Juniper Networks VPN portal and used compromised email accounts from IT vendors to lure victims to it. It’s unclear if the malicious actor compromised the affected vendors’ entire networks or just the email accounts they used to send out messages containing links to the fake VPN portal.
Once taken to the fake Juniper website, victims were instructed to install a VPN client, a legitimate piece of software from Juniper Networks bundled with Helminth, a piece of malware known to be used by OilRig.
According to researchers, these files had been signed with a valid code-signing certificate issued by Symantec to a US-based software company called AI Squared. A different Helminth sample found by ClearSky was signed with a different certificate issued to the same company.
“This suggest that the attackers had got a hold of an AI Squared signing key, potentially after compromising their network,” researchers said. “Alternatively, the attackers might have got Symantec to issue them a certificate under AI Squared’s name.”
In other OilRig attacks, the threat group registered four domain names apparently belonging to Oxford University, including oxford-symposia[.]com, oxford-careers[.]com, oxford[.]in and oxford-employee[.]com.
The first domain mimicked an Oxford conference registration website and instructed visitors to install a tool allegedly needed for pre-registration. The tool, also signed with an AI Squared certificate, prompts users to provide various types of personal information and generates what it claims to be a “pre-registration form.”
Users are then instructed to send the form to an email address hosted on the attackers’ second domain, oxford-careers[.]com. At one point, this domain was linked to oxford[.]in, which had stored some documents, but researchers could not determine what these files contained as they were unavailable during their analysis.
The last fake Oxford domain, oxford-employee[.]com, hosted a job application website and provided users an “official” Oxford CV creator. The fake CV creator is also a tool created by the attackers.
In a blog post published in October, Palo Alto Networks revealed that OilRig had used an IP address mentioned in 2015 by Symantec in a report describing the activities of two Iran-based threat groups, named Cadelle and Chafer, that appeared to be linked. ClearSky has confirmed that the same IP address has been linked to both OilRig and a piece of malware used by Chafer.
While attribution is often difficult, evidence found by researchers suggests that OilRig is based in Iran, including the use of the Persian language in the malware samples, and information associated with the command and control (C&C) domains used by the group.