The Nigerian Communications Commission‘s Computer Security Incident Response Team (NCC-CSIRT) has warned that a new Phishing, Attacks Exploit Windows Zero-Day Vulnerability, can load a malicious QBot malware on the compromised device without triggering any Windows security alerts.
In its advisory signed by Reuben Muoka, Director, Public Affairs at NCC, NCC-CSIRT indicated that the vulnerability, which is present in all versions of Windows-based products, presents as Phishing Attacks and Malware threats.
NCC-CSIRT reports that ProxyLife security researcher discovered the new phishing exploit on Windows zero-day vulnerability to drop a Qbot malware without displaying Mark of the Web (MoTW) security warnings.
“To take advantage of the Windows Mark of the Web zero-day vulnerability, threat actors have switched to a new phishing strategy that involves propagating JS files (plain text files that include JavaScript code) signed with forged signatures. The newest phishing attempt begins with an email that contains a password for the file along with a link to an allegedly important document.
“When the link is clicked, a password-protected ZIP folder that includes another zip file and an IMG file is downloaded. Normally, launching the JS file in Windows would result in a Mark of the Web security warning because it is an Internet-based file. However, the forged signature permits the JS script to function and load the malicious QBot program without triggering any Windows security alerts,” the advisory said.
Accordingly, NCC-CSIRT advised that users apply updates per vendor instructions.
The CSIRT is the telecom sector’s cyber security incidence centre set up by the NCC to focus on incidents in the telecom sector and as they may affect telecom consumers and citizens at large.
The CSIRT also works collaboratively with ngCERT, established by the Federal Government to reduce the volume of future computer risk incidents by preparing, protecting, and securing Nigerian cyberspace to forestall attacks, and problems or related events.
