alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Possible Gamaredon HEAD Request for .dot file on ddns.net"; http.method; content:"HEAD"; http.uri; content:".dot"; endswith; http.user_agent; content:"Microsoft Office"; fast_pattern; http.host; content:".ddns.net"; endswith; reference:md5,dbf4f92852cdae17aa3f2b1234f0140e; reference:md5,b221647d110bd2be2c6e9c5d727ca8db; classtype:command-and-control; sid:2028967; rev:4; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_11_13, deployment Perimeter, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_10_26;)