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:
- Ransomware is growing at an alarming rate, warns GCHQ chief
April 23, 2021
The scale and severity of ransomware is growing at an alarming rate as cyber criminals look to exploit poor cybersecurity to maximise profit, the director of GCHQ has warned. Organisations and their employees have been forced to adapt to different ways of working over the last year, with many now even more reliant on remote services ...
- New cryptomining malware builds an army of Windows, Linux bots
April 23, 2021
A recently discovered cryptomining botnet is actively scanning for vulnerable Windows and Linux enterprise servers and infecting them with Monero (XMRig) miner and self-spreader malware payloads. First spotted by Alibaba Cloud (Aliyun) security researchers in February (who dubbed it Sysrv-hello) and active since December 2020, the botnet has also landed on the radars of researchers at ...
- Ransomware gang offers traders inside scoop on attack victims so they can short sell their stocks
April 23, 2021
Brazen ransomware groups are continuing to seek out new avenues to rake in profits and ratchet up pressure on victims. In one of the latest such developments, the DarkSide ransomware group is openly coaxing stock traders to reach out and receive the inside scoop on the gang’s latest corporate victims, so they can short sell ...
- Telegram Platform Abused in ‘ToxicEye’ Malware Campaigns
April 22, 2021
Hackers are leveraging the popular Telegram messaging app by embedding its code inside a remote access trojan (RAT) dubbed ToxicEye, new research has found. A victim’s computer infected with the ToxicEye malware is controlled via a hacker-operated Telegram messaging account. The ToxicEye malware can take over file systems, install ransomware and leak data from victim’s PCs, ...
- Mount Locker Ransomware Aggressively Changes Up Tactics
April 22, 2021
The Mount Locker ransomware has shaken things up in recent campaigns with more sophisticated scripting and anti-prevention features, according to researchers. And, the change in tactics appears to coincide with a rebranding for the malware into “AstroLocker.” According to researchers, Mount Locker has been a swiftly moving threat. Having just hit the ransomware-as-a-service scene in the ...
- SolarWinds hack analysis reveals 56% boost in command server footprint
April 22, 2021
A new analysis of the SolarWinds breach suggests that the attacker infrastructure behind the campaign is far larger than first believed. The catastrophic SolarWinds security incident involved the compromise of the vendor’s network and later the deployment of malicious SolarWinds Orion updates to clients that contained a backdoor called Sunburst. Sunspot, designed to monitor the SolarWinds build ...