Rule History

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Cobalt Strike Malleable C2 Beacon (Custom)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/image-directory/dz.png"; fast_pattern; bsize:23; http.user_agent; content:"Mozilla/5.0|20 28|Linux|3b 20|Android 6.0|3b 20|HTC One X10 Build/MRA58K|3b 20|wv|29 20|AppleWebKit/537.36|20 28|KHTML, like Gecko|29 20|Version/4.0"; http.header_names; content:!"Referer"; reference:url,isc.sans.edu/diary/rss/28884; reference:url,www.malware-traffic-analysis.net/2022/07/26/index.html; classtype:command-and-control; sid:2037844; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_07_28, deployment SSLDecrypt, performance_impact Low, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_07_28, reviewed_at 2024_09_17;)