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Trojans are malicious files that don’t have any type of included distribution technique (unlike viruses or worms). Although some trojans are disguised as benevolent files that are distributed via spam and social networking routes, others are installed without your knowledge by script-based security exploits or other PC threats. Although trojans don’t distribute themselves, trojans are often used to distribute other types of harmful software; in fact, two popular subcategories of trojans (the trojan downloader and trojan dropper) are designed expressly for such attacks. Our malware researchers encourage you to scan your entire PC if you think you’ve been victimized by a trojan, since the presence of a single trojan can also mean the presence of many other types of malicious software. Although already a common type of PC threat, trojans are only expected to become more prolific than before due to the increasing popularity of botnet-based trojan attacks. These attacks use infected PCs en masse to crash arbitrary websites and typically also grant criminals a high level of access to the computer via a backdoor. Many trojans launch themselves automatically and may conduct their attacks without requiring any form of prompting on the victim’s part. Common Symptoms of Trojan Attacks Symptoms of a trojan infection may be very