It may attempt to shut down task managers or antivirus software to hide its presence.
The file is a compressed RAR archive. While the format itself is safe for data storage, "haha.rar" typically contains a malicious executable file (.exe). Once a user extracts and runs the file, the payload activates. Historically, this specific threat has been flagged by security tools like 360 Total Security as a generic malware variant. How the Infection Works
Because you trust the sender, you download and open the RAR.
Some variants are designed to log keystrokes or steal browser cookies. How to Stay Safe
The golden rule of digital hygiene is to never open unexpected attachments, even from friends. If you have already downloaded a suspicious RAR file, do not extract it. Instead, experts from the Purism community and other security forums recommend uploading the file to a multi-engine scanner like VirusTotal to check for hidden threats before touching it.