alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET EXPLOIT [ConnectWise CRU] Java ECDSA (Psychic) Signed JWT Bypass (CVE-2022-21449)"; flow:established,to_server; http.request_header; header_lowercase; content:"authorization|3a 20|Bearer|20|"; startswith; pcre:"/(?:yJ0eXAiOiJKV1Qi|InR5cCI6IkpXVCJ)/R"; content:"JhbGciOiJFUzI1Ni"; distance:0; fast_pattern; content:"MAYCAQACAQA"; endswith; tag:session,5,packets; reference:cve,CVE-2022-21449; reference:cve,2022-21449; classtype:web-application-activity; sid:2036392; rev:6; metadata:affected_product Java, attack_target Server, created_at 2022_04_27, cve CVE_2022_21449, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_30, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1566, mitre_technique_name Phishing;)