alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Kimsuky Maldoc Activity (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/uy.txt"; endswith; fast_pattern; http.header_names; content:"|0d 0a|Host|0d 0a|Connection|0d 0a 0d 0a|"; bsize:22; reference:url,twitter.com/ShadowChasing1/status/1402239834819743746; reference:md5,dfbe17d9dfa3f3bb715e1d8348bd1f50; classtype:trojan-activity; sid:2033116; rev:1; metadata:attack_target Client_Endpoint, created_at 2021_06_08, deployment Perimeter, malware_family Kimsuky, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_06_08;)