alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE LankerBoy HTTP CnC Beacon"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".txt"; endswith; http.header; content:"User-Agent|3a 20|us|0d 0a|"; fast_pattern; http.header_names; content:!"|0d 0a|Accept"; content:!"|0d 0a|Referer|0d 0a|"; content:"|0d 0a|User-Agent|0d 0a|Host|0d 0a|"; startswith; reference:md5,db2c617a6e53a24fa887e6ecf60a076d; classtype:command-and-control; sid:2020902; rev:5; metadata:attack_target Client_Endpoint, created_at 2015_04_14, deployment Perimeter, signature_severity Major, tag c2, updated_at 2024_03_10, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)