alert tcp any any -> any any (msg:"ET MALWARE US-CERT TA14-353A Lightweight Backdoor 3"; flow:established; content:"|4c 4c|"; depth:2; offset:16; content:"|75 14 2a 2a|"; distance:4; within:4; reference:url,www.us-cert.gov/ncas/alerts/TA14-353A; classtype:trojan-activity; sid:2020009; rev:1; metadata:created_at 2014_12_23, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)