By Joey Chen, Chetan Raghuprasad and Alex Karkins. 

Cisco Talos discovered a new ongoing campaign since at least February 2024, operated by a threat actor distributing three famous infostealer malware, including Cryptbot, LummaC2 and Rhadamanthys.Talos also discovered a new PowerShell command-line argument embedded in the LNK file to bypass anti-virus products and download the final payload into the victims’ host.This campaign uses the Content Delivery Network (CDN) cache domain as a download server, hosting the malicious HTA file and payload. Talos assesses with moderate confidence that the threat actor CoralRaider operates the campaign. We observed several overlaps in tactics, techniques, and procedures (TTPs) of CoralRaider’s Rotbot campaign, including the initial attack vector of the Windows Shortcut file, intermediate PowerShell decryptor and payload download scripts, the FoDHelper technique used to bypass User Access Controls (UAC) of the victim machine.  

Victimology and actor infrastructure

The campaign affects victims across multiple countries, including the U.S., Nigeria, Pakistan, Ecuador, Germany, Egypt, the U.K., Poland, the Philippines, Norway, Japan, Syria and Turkey, based on our telemetry data and OSINT information. Our telemetry also disclosed that some affected users were from Japan’s computer service call center organizations and civil defense service organizations in Syria. The affected users were downloading files masquerading as movie files through the browser, indicating the possibility of a widespread attack on users across various business verticals and geographies.

We observe that this threat actor is using a Content Delivery Network (CDN) cache to store the malicious files on their network edge host in this campaign, avoiding request delay. The actor is using the CDN cache as a download server to deceive network defenders. 

CDN edge URLs 

suspected coralraider continues expand victimology using three information stealers