In most campaigns using this specific naming format, the final payload is , a powerful Information Stealer. Its primary goals include:
: A small, encrypted payload (often a "GuLoader" variant) executes in memory.
The .rar extension is used to bypass basic email security filters that might block direct executable files ( .exe ). Inside the archive, there is typically an executable or a script file (like .vbs or .js ) that uses to hide its true intent from antivirus software. 2. The Execution Chain 09 DECEMBER 25000PCS @OTTOMANCLOUD.rar
: If you have this file, delete it immediately without extracting the contents.
: Creating registry keys under HKCU\Software\Microsoft\Windows\CurrentVersion\Run to ensure the malware starts every time the computer reboots. Recommendations In most campaigns using this specific naming format,
: If the file was executed, perform a full offline scan using an updated EDR (Endpoint Detection and Response) or antivirus solution.
: It injects the final malicious code into a legitimate Windows process (like RegAsm.exe or cvtres.exe ) to hide its activity from the Task Manager. 3. Payload Functionality: Agent Tesla Inside the archive, there is typically an executable
: Check the original email address. These often come from hijacked legitimate accounts or look-alike domains.