Official scripts for Comodo Client - Security use a file named update.7z hosted on their servers to deliver binary updates to Windows systems.
The file is a generic name for a compressed archive used by various software applications and systems to deliver updates, patches, or configuration files. Because it is a common name, its purpose and contents depend entirely on the software that created it. Overview of "Update.7z" Update.7z
Some software like the PCSX2 emulator uses update.7z as a staging file during its auto-update process. Users have reported bugs where this file remains in the application directory even after the update is complete. Official scripts for Comodo Client - Security use
Use a tool like 7-Zip to view the contents without extracting them. Look for suspicious files like unexpected .dll or .exe files that don't match the software's known components. Technical Summary File Extension .7z (7-Zip Archive) Common Origin Automated software update scripts or installers Typical Contents Overview of "Update
Variable (Legitimate if from trusted software; high risk if found in unexpected directories) Update 7z binary and License.txt #39 - GitHub
Legitimate update binaries inside the archive are often digitally signed by the software vendor.
Given that attackers use this generic name to hide malicious payloads, always scan the file with an antivirus or upload it to a service like VirusTotal before attempting to open it.