alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32.Agent.cah Checkin Request"; flow:established,to_server; content:"?v="; nocase; http_uri; content:"&mid="; nocase; http_uri; content:"&r1="; nocase; http_uri; content:"&tm=201"; nocase; http_uri; content:"&av="; nocase; http_uri; content:"&os=Windows"; nocase; http_uri; content:"&uid="; nocase; http_uri; content:"cht="; http_uri; classtype:command-and-control; sid:2007644; rev:7; metadata:created_at 2010_07_30, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)