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.

Detailed description

Software that works with osa file extension

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OSA file - W32/Sober-AD data

What is osa file? How to open osa files?

File type specification:

Dangerous and malicious file type icon Dangerous and malicious file type

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.

Updated: March 29, 2018

The default software associated to osa file type:

Avast Antivirus icon

AVAST Software a.s. logoAvast Antivirus  Microsoft Windows software

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.

Help how to open:

You cannot access these files manually.

How to convert:

Cannot be converted to anything else.

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).

  • Others osa file

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 small icon Avast Antivirus
Other suggested software:
BitDefender small icon BitDefender
AVG Antivirus small icon AVG Antivirus
Norton Antivirus small icon Norton Antivirus

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