Versions (4)
Version DetailsCurrent
Rev: 2 • Mar 27, 2019, 12:00 PMET MALWARE ELF/Mirai Variant UA Outbound (lessie)
alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE ELF/Mirai Variant UA Outbound (lessie)"; flow:established,to_server; http.user_agent; content:"lessie"; nocase; depth:6; pcre:"/^lessie(?:\/[0-9]\.0)?$/i"; classtype:trojan-activity; sid:2027129; rev:2; metadata:affected_product Linux, attack_target IoT, created_at 2019_03_27, deployment Perimeter, malware_family Mirai, performance_impact Low, confidence High, signature_severity Major, updated_at 2020_08_28;)
Mar 27, 2019, 12:00 PM
Aug 28, 2020, 12:00 PM
Sep 21, 2024, 3:00 AM
May 30, 2025, 12:04 AM
rules/emerging-malware.rules