Packers can compress Trojan horses to different levels, meaning that a single Trojan horse might be released in several versions. For example, Trojan horses are often masked by the use of packers (programs that compress the Trojan horse into a version that still runs but no longer resembles the original). Indeed, programs are readily available that have been built for this purpose. Unfortunately, a key disadvantage of purely reactive systems is that they can't detect and clean new malware until they've added a new signature for that malware, thus creating a window of opportunity for hackers during which internal mail systems and end users are vulnerable.Īlso, malware can easily be modified to prevent a match with the vendor's signature. Additionally, signature-based matching tends to be exceptionally accurate, which results in low false-positive and false-negative rates. One advantage is that signature- and rule-based scanning for malware tends to be fast compared to other virus-detection methods (e.g., predictive/heuristic). This process has both advantages and disadvantages. After the download, the antivirus product on the client can detect the new malware. The vendor adds the new signature or rule to its database for release to customers through either a push-initiated or a pull-initiated download. The vendor analyzes the malware and creates a signature or rule that will match the malware in email messages.

After the malware is released, the antivirus vendor accepts a sample of the malware (e.g., from a customer, from a vendor-run honeypot). Reactive solutions generally can't detect a particular piece of malware until after it's released (although some solutions do try to detect patterns that would alert them to malware to reduce this disadvantage as much as possible). WithĪ reactive solution, malware is detected through a multistage process that depends Malware detection is still very much in the domain of reactive solutions. To stop viruses, Trojan horses, and spyware rely on either reactive or predictive

Generally, server-level and network-level solutions Most organizations, with products that can detect and remove spyware being introduced To make matters worse, spyware is still a relatively new concern for Lag behind when it comes to solutions that properly protect users against theseĪttacks. Unfortunately, most IT departments continue to Viruses attack both servers andĮnd-user systems constantly. Too many, a devastating impact on business. Viruses, Trojan horse programs, and spyware have all had a large, and, for

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