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Rev: 1 • Dec 13, 2021, 12:00 PMET EXPLOIT Possible Apache log4j RCE Attempt - 2021/12/13 Obfuscation Observed (tcp) (CVE-2021-44228)
alert tcp any any -> [$HOME_NET,$HTTP_SERVERS] any (msg:"ET EXPLOIT Possible Apache log4j RCE Attempt - 2021/12/13 Obfuscation Observed (tcp) (CVE-2021-44228)"; flow:established,to_server; content:"|24 7b|"; pcre:"/^(j|\x24\x7b(lower|upper)\x3aj\x7d|\x24\x7b\x3a\x3a\-j\x7d)(n|\x24\x7b(lower|upper)\x3an\x7d|\x24\x7b\x3a\x3a\-n\x7d)/Ri"; content:"|3a|"; distance:0; content:"|24 7b|env|3a|"; distance:0; reference:cve,2021-44228; classtype:attempted-admin; sid:2034676; rev:1; metadata:attack_target Server, created_at 2021_12_13, cve CVE_2021_44228, deployment Perimeter, deployment Internal, confidence Medium, signature_severity Major, tag Exploit, tag CISA_KEV, updated_at 2023_06_05, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;)
Dec 13, 2021, 12:00 PM
Jun 5, 2023, 12:00 PM
Sep 21, 2024, 3:00 AM
May 30, 2025, 12:04 AM
rules/emerging-exploit.rules