Files with osa file extension are mostly generated by malicious W32/Sober-AD mass-mailing worm. Take great care when working with these files and run anti-virus software.
Software that open osa file
OSA file extension - W32/Sober-AD data
What is osa file? How to open osa files?
File type specification:
The osa file extension is reported to be used by W32/Sober-AD mass-mailing worm for the Windows platform. Most likely used for one of the files generated the the worm.
Should be purged from system using some security software.
The default software associated to open osa file:
Company or developer:
AVAST Software a.s.
Avast antivirus is one of the most used antivirus programs with over 220 mil. users. The Essential version is available for free and can be upgraded to All-inclusive or Top-notch editions.
The program is available mainly for Windows, but there is also version for Mac, Linux and main mobile OS platforms for Android phones and Apple iPhones/iPads.
List of recommended software applications associated to the .osa file extension
Recommended software programs are sorted by OS platform (Windows, macOS, Linux, iOS, Android etc.)
and possible program actions that can be done with the file: like open osa file, edit osa file, convert osa file, view osa file, play osa file etc. (if exist software for corresponding action in File-Extensions.org's database).
Unspecified and all other actions for computer programs working with osa file - W32/Sober-AD data
Click on the software link for more information about Avast Antivirus. Avast Antivirus uses osa file type for its internal purposes and/or also by different way than common edit or open file actions (eg. to install/execute/support an application itself, to store application or user data, configure program etc.).
Microsoft Windows:
Main software associated with osa file by default: Avast Antivirus
Other suggested software: AVG Antivirus
Norton Antivirus
BitDefender