Trojan-Downloader.HTML.Agent.sl

Web browser users who visit dangerous sites or sites that host dangerous advertising may find themselves infected by Trojan-Downloader.HTML.Agent.sl, a backdoor Trojan. Trojan-Downloader.HTML.Agent.sl infections have garnered a reputation for attacking computer security, hijacking web browsers and dropping other malware onto the machine. The Trojan-Downloader.HTML.Agent.sl infection may also infect memory processes to make detection and removal more difficult, so react with appropriate caution even if a single scan seems to indicate that your PC is in the clear.

Through Your Browser and onto Your Hard Drive

Trojan-Downloader.HTML.Agent.sl was noticed as a recent Trojan threat in February of 2011. This new threat is, actually, was categorized as one of the most dangerous threats of the month! The blame for this lies on Trojan-Downloader.HTML.Agent.sl's unpleasantly innovative use of CSS and iFrame-based infection methods. These techniques can avoid detection by many different anti-malware products, and even fully updated programs not fail to catch Trojan-Downloader.HTML.Agent.sl during the opening salvo.

Like many other Trojans, Trojan-Downloader.HTML.Agent.sl will attempt to run imperceptibly but automatically through adding entries to your Windows Registry. Whenever the PC starts in a normal boot mode, Trojan-Downloader.HTML.Agent.sl will start as well, even if you can't see the process in memory.

Besides running itself, Trojan-Downloader.HTML.Agent.sl will infect other running processes in memory. This can make it difficult to detect and even harder to delete; a proven anti-malware program that has been verified to delete Trojan-Downloader.HTML.Agent.sl is your best chance of ridding yourself of the Trojan.

Trojan-Downloader.HTML.Agent.sl's Encroachment on Your Computer

Trojan-Downloader.HTML.Agent.sl will attack any PC it infects from multiple directions, all of them serious:

• Trojan-Downloader.HTML.Agent.sl will operate as a backdoor Trojan and lower your firewall, block security applications and generally alter security-related settings to allow attackers free access. The primary purpose of such attacks is to let remote attackers steal financial, identity and account-related information from your computer, or to use your computer for illegal activities such as further malware propagation or DDoS attacks.
• Trojan-Downloader.HTML.Agent.sl will drop malware onto your machine. Less advanced malware can be seen active as memory processes in your Task Manager, but some will be as efficiently hidden as Trojan-Downloader.HTML.Agent.sl itself. Malware can take the form of keyloggers that record your keystrokes, rogue security applications that fake the appearance of a helpful security product or other malicious software.
• Finally, Trojan-Downloader.HTML.Agent.sl is also a confirmed browser hijacker. Trojan-Downloader.HTML.Agent.sl may prevent you from accessing safety and security-based websites and can redirect your browser to hostile websites. Malicious sites may drop other dangerous programs without your permission and should never be trusted with private information like your credit card number.

Given this Trojan's ability to infect innocent memory processes, deleting Trojan-Downloader.HTML.Agent.sl is likely to fail if done manually. Advanced and reliable brands of anti-malware tools should be used to scrub Trojan-Downloader.HTML.Agent.sl off your system, with attentiveness to being sure no other related infections miss notice.