alert tcp $HOME_NET any -> $EXTERNAL_NET 1024: (msg:"ET MALWARE W32/Kegotip CnC Beacon"; flow:established,to_server; content:"QXNka"; depth:5; reference:url,www.soleranetworks.com/blogs/cryptolocker-kegotip-medfos-malware-triple-threat/; reference:url,www.microsoft.com/security/portal/threat/encyclopedia/Entry.aspx?Name=PWS%3AWin32%2FKegotip.C; classtype:command-and-control; sid:2017627; rev:3; metadata:attack_target Client_Endpoint, created_at 2013_10_22, deployment Perimeter, signature_severity Major, tag c2, updated_at 2019_07_26, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)