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:
- New Epsilon Red ransomware hunts unpatched Microsoft Exchange servers
May 29, 2021
A new ransomware threat calling itself Red Epsilon has been seen leveraging Microsoft Exchange server vulnerabilities to encrypt machines across the network. Epsilon Red ransomware attacks rely on more than a dozen scripts before reaching the encryption stage and also use a commercial remote desktop utility. Read more… Source: Bleeping Computer
- DarkSide on Linux: Virtual Machines Targeted
May 28, 2021
As we discussed in our previous blog, the DarkSide ransomware is targeting organizations in manufacturing, finance, and critical infrastructures in regions such as the United States, France, Belgium, and Canada. The DarkSide ransomware targets both Windows and Linux platforms. We also noticed that the Linux variant, in particular, targets ESXI servers. In this blog, we focus ...
- Russian gang behind SolarWinds hack returns with phishing attack disguised as mail from US aid agency
May 28, 2021
Nobelium, the Russia-aligned gang identified as the perpetrators of the supply chain attack on SolarWinds’ Orion software, has struck again, Microsoft vice president Tom Burt in a blogpost Thursday. Burt’s post says the attacks saw Nobelium gain access to accounts on the email marketing service “Constant Contact” operated by The United States Agency for International Development ...
- Re-Checking Your Pulse: Updates on Chinese APT Actors Compromising Pulse Secure VPN Devices
May 27, 2021
Mandiant published detailed results of our investigations into compromised Pulse Secure devices by suspected Chinese espionage operators. This blog post is intended to provide an update on our findings, give additional recommendations to network defenders, and discuss potential implications for U.S.-China strategic relations. Mandiant continues to gather evidence and respond to intrusions involving compromises of Pulse ...
- Threats From a Compromised 4G/5G Campus Network
May 27, 2021
Over the past two decades, industrial sectors and everyday users have reaped the benefits of advancements in telecom technologies. At present, the catalyst and basis for future changes is 5G. A sign of this continuing development and influence for some industries is their investment in non-public networks (NPN), also commonly referred to as campus networks. The ...
- PDF Feature ‘Certified’ Widely Vulnerable to Attack
May 26, 2021
Certified portable document format (PDF) files are used to securely sign agreements between two parties while keeping the contents’ integrity protected, but a new report found the security protections on most certified PDF applications were inadequate and left organizations exposed to a number of attacks. Researchers from Ruhr University Bochum explained certified PDFs use two specific ...