Trojan.Agent/Gen-Siggen is a horrible Trojan with rootkit ability. It silently enters a system and settles down in the memory. In the meanwhile, it installs its subkeys into the registry and also configures the MBR due to which it executes direclty as the system boots up. Its addition of values into the Windows registry gives it ability to run as a valid process, but at the same time it hampers other applications to run as well.
Spam email attachments, visiting links and ads on adult sites are a couple of major sources that helps Trojan.Agent/Gen-Siggen to enter the system silently. Besides this, another malware in the system can also bring this harmful Trojan right into the system. After entering, Trojan.Agent/Gen-Siggen it hijacks the browser and blocks websites from opening up. It also disables firewalls or anti-virus security applications. But most of the time it remains undetected because of the rootkit ability. It is a very horrendous PC Trojan and one should not ignore its presence at all.
