alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE W32/TrojanSpy.MSIL Fetch Time CnC Beacon"; flow:established,to_server; http.uri; content:"/features/fetch/time/"; http.header_names; content:!"User-Agent|0d 0a|"; content:!"Content-"; content:!"Accept-"; reference:url,www.microsoft.com/security/portal/threat/encyclopedia/entry.aspx?Name=TrojanSpy%3AMSIL%2FCrime.B; classtype:command-and-control; sid:2016533; rev:3; metadata:attack_target Client_Endpoint, created_at 2013_03_05, deployment Perimeter, signature_severity Major, tag c2, updated_at 2020_04_23, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)