alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET USER_AGENTS Suspicious User-Agent (ItIsMe)"; flow:established,to_server; http.user_agent; content:"ItIsMe"; startswith; fast_pattern; reference:url,resources.cylera.com/new-evidence-linking-kwampirs-malware-to-shamoon-apts; classtype:trojan-activity; sid:2035445; rev:4; metadata:attack_target Client_Endpoint, created_at 2022_03_14, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_13;)