Malware
Enviserv
According to Microsoft, Enviserv is a malicious program that is unable to spread of its own accord.
Enviserv is a Windows malware family.
Background
Microsoft describes Enviserv as malware that cannot propagate on its own. Once on a victim machine, it can carry out a variety of operations chosen by the attacker.
Source: Malpedia (Fraunhofer FKIE).