Rule History

SID: 2026876 • Source: et/open

Versions (3)

Version DetailsCurrent

Rev: 5 • Feb 4, 2019, 12:00 PM

Message:

ET MALWARE Cayosin Botnet User-Agent Observed M1

Rule:

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Cayosin Botnet User-Agent Observed M1"; flow:established,to_server; http.user_agent; content:"Cayosin/2.0"; depth:11; fast_pattern; endswith; classtype:trojan-activity; sid:2026876; rev:5; metadata:affected_product Linux, attack_target Server, created_at 2019_02_04, deployment Perimeter, malware_family Mirai, malware_family Cayosin, performance_impact Low, confidence High, signature_severity Major, updated_at 2020_09_16;)

Created:

Feb 4, 2019, 12:00 PM

Updated:

Sep 16, 2020, 12:00 PM

DB Created:

Sep 21, 2024, 3:00 AM

DB Updated:

May 30, 2025, 12:04 AM

Filename:

rules/emerging-malware.rules