alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Bitter RAT HTTP CnC Beacon"; flow:established,to_server; threshold:type both, count 1, seconds 120, track by_src; http.method; content:"GET"; http.uri; content:".php?cId="; fast_pattern; content:"&hos"; distance:0; content:"Name="; distance:0; content:"Info="; distance:0; http.header_names; content:!"User-Agent|0d 0a|"; content:!"Accept"; reference:url,blogs.forcepoint.com/security-labs/bitter-targeted-attack-against-pakistan; reference:md5,2b07e054a1abb2941e5e70fba652a211; classtype:command-and-control; sid:2023400; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2016_10_24, deployment Perimeter, malware_family Bitter_implant, signature_severity Major, tag c2, updated_at 2020_09_02, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)