The name че (Russian for "what") suggests a casual, perhaps hurried upload. It could be anything:
Before opening, upload the zip to VirusTotal. It will run the file through dozens of antivirus engines to see if anything jumps out. че.rar_pass_123.zip
Should we adjust the tone to be or perhaps more creepy-pasta/horror style? The name че (Russian for "what") suggests a
Open the file inside a Virtual Machine (VM) or a sandbox environment. If it is malicious, it stays trapped in the "fake" computer. a forgotten private key
A rare game mod, a forgotten private key, or a meme folder from 2012.