Malware
Yasso
According to Palo Alto Networks, Yasso is an open source multi-platform intranet-assisted penetration toolset that brings together a number of features such as scanning, brute forcing, remote interact
Yasso is a Windows malware family.
Background
Palo Alto Networks characterizes Yasso as an open-source, cross-platform intranet penetration toolkit that bundles capabilities including scanning, brute forcing, an interactive remote shell, and execution of arbitrary commands. Its author is a Mandarin-speaking pentester who goes by the handle Sairson.
Source: Malpedia (Fraunhofer FKIE).