Google’s Threat Analysis Group (TAG) reported that in recent weeks multiple nation-state actors were spotted exploiting the vulnerability CVE-2023-38831 in WinRAR. The researchers reported that several cybercrime groups began exploiting the flaw in early 2023, when the bug was still a zero-day. The vulnerability has been patched, but but many have yet to update their installs.
The threat actors used a lure themed as an invitation to join the school, the email included a link to an anonymous file-sharing service, fex[.]net. The file-sharing service was used to deliver a benign decoy PDF document with a drone operator training curriculum and specially crafted ZIP archive (“Навчальна-програма-Оператори.zip” (Training program operators)) that exploits the flaw CVE-2023-38831.
In September, CERT-UA observed the FROZENLAKE group exploitingthe WinRAR flaw to deploy malware in attacks aimed at energy infrastructure.
Google TAG experts also observed the Russia-linked ATP28 group exploiting the flaw in attacks against Ukraine users. The state-sponsored hackers employed a malicious PowerShell script (IRONJAW) to steal browser login data and local state directories.
The China-linked APT40 group was observed exploiting the CVE-2023-38831 vulnerability in attacks against targets in Papua New Guinea.
“The widespread exploitation of the WinRAR bug highlights that exploits for known vulnerabilities can be highly effective, despite a patch being available. Even the most sophisticated attackers will only do what is necessary to accomplish their goals. These recent campaigns exploiting the WinRAR bug underscore the importance of patching and that there is still work to be done to make it easy for users to keep their software secure and up-to-date. TAG will continue to compile and share threat intelligence for the protection of online users and Google products, in the meantime, we encourage organizations and users to keep their software fully up-to-date.”
(SecurityAffairs – hacking, WinRAR)