alert ftp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE TA453 Related Activity (FTP)"; flow:established,to_server; content:"VICTIM-PC__"; fast_pattern; content:"/screen/"; content:".jpg"; reference:url,research.checkpoint.com/2022/apt35-exploits-log4j-vulnerability-to-distribute-new-modular-powershell-toolkit/; classtype:trojan-activity; sid:2034890; rev:1; metadata:attack_target Client_Endpoint, created_at 2022_01_11, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_01_11;)