Cybercriminals Exploit Microsoft Word Vulnerabilities to Deploy LokiBot Malware

Cybercriminals Exploit Microsoft Word Vulnerabilities to Deploy LokiBot Malware

Microsoft Word documents exploiting known remote code execution flaws are being used as phishing lures to drop malware called LokiBot on compromised systems.

“LokiBot, also known as Loki PWS, has been a well-known information-stealing Trojan active since 2015,” Fortinet FortiGuard Labs researcher Cara Lin said.

“It primarily targets Windows systems and aims to gather sensitive information from infected machines.”

The cybersecurity company, which spotted the campaign in May 2023, said the attacks take advantage of CVE-2021-40444 and CVE-2022-30190 (aka Follina) to achieve code execution.

The Word file that weaponizes CVE-2021-40444 contains an external GoFile link embedded within an XML file that leads to the download of an HTML file, which exploits Follina to download a next-stage payload, an injector module written in Visual Basic that decrypts and launches LokiBot.

LokiBot Malware

An alternative chain discovered towards the end of May starts with a Word document incorporating a VBA script that executes a macro immediately upon opening the document using the “Auto_Open” and “Document_Open” functions.

The macro script subsequently acts as a conduit to deliver an interim payload from a remote server, which also functions as an injector to load LokiBot and connect to a command-and-control (C2) server.

LokiBot, not to be confused with an Android banking trojan of the same name, comes with capabilities to log keystrokes, capture screenshots, gather login credential information from web browsers, and siphon data from a variety of cryptocurrency wallets.