In a recent wave of attacks during February 2019, Elfin attempted to exploit a known vulnerability (CVE-2018-20250) in WinRAR, the widely used file archiving and compression utility capable of creating self-extracting archive files. The exploit was used against one target in the chemical sector in Saudi Arabia. If successfully exploited on an unpatched computer, the vulnerability could permit an attacker to install any file on the computer, which effectively permits code execution on the targeted computer