DoS, DDoS Tool (generic description).
A DoS tool is a Denial of Service attack trojan.
Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.
A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:
Check for the latest database updates
First check if your F-Secure security program is using the latest updates, then try scanning the file again.
Submit a sample
After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.
Note: If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.
Exclude a file from further scanning
If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.
Note: You need administrative rights to change the settings.
A DoS attack is the type of attack when a massive amount of requests is sent to a specific target from one or several hosts. When a target reaches its capacity of handling such requests, it becomes incapable of answering all the requests it gets. So if a DoS attack is done by a trojan, that continuously sends massive amount of requests to a target (web, IRC server or a selected IP address), a target is kept busy processing only the requests sent by a trojan and requests coming from other sources are not processed at all or are processed with delays.
DoS attacks become quite popular nowdays as they are in many cases quite effective. For example in 2002 there was a DoS attack on a few IRC servers and many users were unable to connect to these servers. Also in 2002 there was an attack on a few big websites and that disrupted normal communications to those sites and caused losses to the companies who owned them.
Some worms perform a so-called 'political' DoS attack. For example Yaha worm tries to DoS the Pakistanian government website. Some trojans and worms try to DoS Microsoft's website.