The name you mentioned is very similar to Wacatac (or Watacat ), a common family of trojans that Windows Defender often flags. These trojans are known for: Stealing passwords and banking info. Setting up Remote Access (RATs) to control your PC.
While there isn't a single famous "Watsica.rar" paper, researchers frequently use archives like this to deliver "Wacatac" trojans by exploiting known WinRAR vulnerabilities. Watsica.rar
Using advanced "obfuscation" to hide from antivirus software. The name you mentioned is very similar to