By far the best way is to run a scan of your system with a suitable tool.
Antivirus software will detect and often remove most trojans horses as well as viruses but for more stubborn problems a dedicated anti-trojan package may be needed. We recommend Swat-IT from Lockdown Corp. which will detect and remove almost all known trojan horses. As with virus scanners, it needs to be kept updated as new trojans are being released all the time.
Other telltale signs include :
- Unexplained activity (windows opening or closing on their own, mouse moving on it's own, cd-rom opening or closing etc.)
- Unusual message boxes or strange error messages.
- Outlook or outlook express taking a long time to close or seeming to hang when you preview a specific message (can indicate an email worm).
- Corrupt files.
- Unknown programs in the task list (NT, Win2k)
- Alerts from your firewall about OUTBOUND communication from an unusual source
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