April 2, 2003: Graybird is a Trojan horse that hides its presence on the compromised computer and downloads files from remote Web sites. There are many variations of this virus such as Backdoor.Graybird.P (the most recently discovered variation). It affected Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows Server 2003, Windows XP, […]

Malicious code is unwanted files or programs that can cause harm to a computer or compromise data stored on a computer. Various classifications of malicious code include viruses, worms, and Trojan horses.

In our year-end roundup of the worst malware threats of 2017, we compared malware to actual biological viruses, in that both are ever-evolving phenomena. For example, you know how it’s recommended for certain demographics to get a flu shot every year?  The rationale is simple: The flu virus itself is never identical from year to year, meaning that […]

October 12, 2004: Bifrost is a backdoor trojan horse family of more than 10 variants which can infect Windows 95 through Windows 10 (although on modern Windows systems, after Windows XP, its functionality is limited). Bifrost uses the typical server, server builder, and client backdoor program configuration to allow a remote attacker, who uses the […]

A type of malware that disguises itself as a normal file to trick a user into downloading it in order to gain unauthorized access to a computer.

Several thousand floppy disks containing the AIDS Trojan, the first known ransomware, are mailed to subscribers of PC Business World magazine and a WHO AIDS conference mailing list. This DOS Trojan lies dormant for 90 boot cycles, then encrypts all filenames on the system, displaying a notice asking for $189 to be sent to a […]