alert tcp any any -> any any (msg:"ET MALWARE njrat ver 0.7d Malware CnC Callback (Capture)"; flow:established; content:!"GET|20|"; content:"|FF D8 FF E0 00 10 4A 46 49 46|"; content:"|00|CAP|7c 27 7c 27 7c|"; nocase; fast_pattern; pcre:"/^\d{1,6}\x00cap\x7c/i"; reference:md5,bbc68c34bb2dac3ae382ecf785bdb441; classtype:command-and-control; sid:2019214; rev:2; metadata:created_at 2014_09_23, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)