alert http [$HOME_NET,$HTTP_SERVERS] any -> any any (msg:"ET EXPLOIT Mirai Infection Attempt via OS Command Injection Outbound (CVE-2021-32305)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/search.php?search=|22|"; startswith; fast_pattern; pcre:"/^(?:[\x3b\x24\x26\x60\x7c]|\x25(?:25)?(?:3[bB]|2[46]|60|7[cC])|\x5c[rn])/R"; reference:url,unit42.paloaltonetworks.com/cve-2021-32305-websvn/; reference:cve,2021-32305; classtype:attempted-admin; sid:2033856; rev:4; metadata:affected_product HTTP_Server, attack_target Networking_Equipment, tls_state plaintext, created_at 2021_08_31, cve CVE_2021_32305, deployment Perimeter, malware_family Mirai, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2026_08_28, mitre_tactic_id TA0008, mitre_tactic_name Lateral_Movement, mitre_technique_id T1210, mitre_technique_name Exploitation_Of_Remote_Services; target:dest_ip;)