alert http1 $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE MSIL/Agent.PYO Retrieving Update"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/data_updater.dat"; fast_pattern; endswith; http.header_names; content:!"|0d 0a|User-Agent|0d 0a|"; content:!"|0d 0a|Accept"; content:!"|0d 0a|Referer|0d 0a|"; content:"|0d 0a|Host|0d 0a 0d 0a|"; startswith; reference:url,welivesecurity.com/2015/01/29/msilagent-pyo-have-botnet-will-travel/; classtype:trojan-activity; sid:2020333; rev:6; metadata:created_at 2015_01_30, malware_family MSIL_Agent_PYO, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_07;)