From January through May 2026, Mandiant identified a financially motivated data theft extortion campaign executed by the threat cluster UNC3753 (also tracked as “Luna Moth,” “Chatty Spider,” and “Silent Ransom Group”) targeting dozens of organizations across professional, legal, and financial services in the United States.
UNC3753 leverages voice phishing (vishing) and social engineering deception techniques to achieve remote access into corporate environments. Using pretexts such as data migration or invoice related emails, the threat actors initiate phone conversations posing as IT support and convince targets to host screen-sharing sessions and download remote monitoring and management (RMM) utilities.
Read more…
Source: Mandiant
Sign up for the Cyber Security Review Newsletter
The latest cyber security news and insights delivered right to your inbox
Related:
- Ninth day of pro-Russia cyber attacks on Italian sites
February 25, 2025
A pro-Russian hacker group, Noname057(16), staged for the ninth consecutive morning on Tuesday a new wave of cyberattacks against Italian websites, specifically targeting local administrations. The provinces of Trapani, Ragusa, Caltanissetta, Enna, the municipality of Catania and the Puglia region were among those affected by the attacks. The Agency for National Cybersecurity is providing help to ...
- The GitVenom campaign: cryptocurrency theft using GitHub
February 24, 2025
In our modern world, it’s difficult to underestimate the impact that open-source code has on software development. Over the years, the global community has managed to publish a tremendous number of projects with freely accessible code that can be viewed and enhanced by anyone on the planet. With more and more open-source projects being published, both ...
- F5 Releases Quarterly Security Notification
February 24, 2025
F5 has released an overview of vulnerabilities for some of their networking products, including BIG-IP and BIG-IP Next. The overview of security advisories addresses 13 vulnerabilities rated as high impact, 3 rated as medium impact, and 1 as low impact. One of the high impact advisories concerns the command injection vulnerability CVE-2025-20029, which has a CVSSv4 ...
- Crypto exchange Bybit says it fully replenished reserves after record $1.5 billion hack
February 24, 2025
Bybit said it replenished its reserves following a $1.5 billion hack last week, the largest in the history of the crypto industry. In less than 72 hours, Bybit pieced together hundreds of thousands of ether tokens through a mix of emergency loans and large deposits. While the rapid recovery restored the exchange’s balance and kept customer ...
- Medixant Releases Security Update for RadiAnt DICOM Viewer
February 24, 2025
Medixant has released a security update to address an improper certificate validation vulnerability in RadiAnt DICOM Viewer. CVE-2025-1001 has a CvSSv4 score of 5.7 and could allow an attacker with privileged network access to impersonate RadiAnt’s update server. An attacker could modify the server’s response to deliver a malicious update to the user, performing a machine-in-the-middle ...
- South African Weather Service systems restored amid increasing cyber attacks
February 24, 2025
The SAWS Information and Communication Technology (ICT) systems went down on January 26 following a security breach by criminals. Aspects of critical services including aviation and marine were all interrupted. The SAWS email system and website, which is the hub of critical weather information, were also affected. The attack was the second in the space of ...