For detailed technical breakdowns of this type of threat, you can find reports from cybersecurity firms like ESET Research or Securelist by Kaspersky , which frequently document the evolution of the Grandoreiro banking trojan.

: The file name is designed to look like a personal gift or greeting to encourage downloads.

This specific file has been historically associated with , a prolific Brazilian banking trojan. This malware typically targets users in Spanish and Portuguese-speaking countries, using social engineering themes like "Happy Birthday" or fake invoices to trick users into downloading and executing the malicious payload. Key Characteristics of the Malware Campaign:

: Once the user extracts and runs the contents (usually an executable disguised with a generic icon), it installs a backdoor that can capture keystrokes, take screenshots, and manipulate bank website forms to steal credentials.

: Often distributed via phishing emails containing links to download the .zip file from compromised websites or legitimate cloud storage services.

: It primarily targets financial information by monitoring web browser activity for banking sessions.