MALWARE FAMILY

Yasso

Internal ID: win.yasso

aliases

Last seen:Mar 17, 2026

Intelligence Profile

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 interactive shell, and running arbitrary commands. It is authored by a Mandarin-speaking pentester nicknamed Sairson.

Threat Analysis

Yasso is a malware family tracked by threat intelligence researchers and catalogued in the Malpedia dataset. It represents a distinct malicious software lineage with identifiable code characteristics, behaviors, and victimology.

External References

→https://nattothoughts.substack.com/p/reconnaissance-scanning-tools-used

→https://www.paloaltonetworks.com/blog/security-operations/through-the-cortex-xdr-lens-uncovering-a-new-activity-group-targeting-governments-in-the-middle-east-and-africa/

Quick Facts

TypeMalware Family

Aliases1

Also Known As

win.yasso

Research Links

MITRE ATT&CK VirusTotal Google (news) Twitter/X search

Data sourced from Malpedia, Ransomware.live, RansomLook, and CTIWATCH OSINT collection. Actor attribution is based on available intelligence and may be incomplete.

← All Threat Actors·Geopolitics Map·Search Yasso