Sober worm spreads via email messages. A person needs to run a malicious file attached to a message in order to get infected. As curiosity is in our nature, a lot of people tends to open email messages from strangers and also view attachments.
Once Sober is inside a computer, it scans various documents for email addresses and makes a list. Later it sends random messages to email addresses from the list with copy of itself attached. That’s why you need to think twice before opening a suspicious email from stranger.
If you’re already infected with this worm follow sober removal.

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