ET EXPLOIT Apache log4j RCE Attempt - 2021/12/12 Obfuscation Observed (tcp) (CVE-2021-44228) - Suricata Rule 2034702 (et/open)

ET EXPLOIT Apache log4j RCE Attempt - 2021/12/12 Obfuscation Observed (tcp) (CVE-2021-44228)

SID: 2034702Rev: 10 viewsHistory

Sourceet/open

CreatedDecember 14, 2021

UpdatedDecember 14, 2021

Classificationattempted-admin

alert tcp any any -> [$HOME_NET,$HTTP_SERVERS] any (msg:"ET EXPLOIT Apache log4j RCE Attempt - 2021/12/12 Obfuscation Observed (tcp) (CVE-2021-44228)"; flow:established,to_server; content:"|24 7b|"; fast_pattern; 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; pcre:"/^(l|r|d|\x24\x7b(lower|upper)\x3a(l|r|d)\x7d|\x24\x7b\x3a\x3a\-(l|r|d)\x7d)(d|n|m|\x24\x7b(lower|upper)\x3a(d|n|m)\x7d|\x24\x7b\x3a\x3a\-(d|n|m)\x7d)(a|i|s|\x24\x7b(lower|upper)\x3a(a|i|s)\x7d|\x24\x7b\x3a\x3a\-(a|i|s)\x7d)(p|\x24\x7b(lower|upper)\x3a(p)\x7d)/Ri"; content:"|3a 2f 2f|"; distance:0; reference:cve,2021-44228; classtype:attempted-admin; sid:2034702; rev:1; metadata:attack_target Server, created_at 2021_12_14, cve CVE_2021_44228, deployment Perimeter, deployment Internal, confidence High, signature_severity Major, tag Exploit, tag CISA_KEV, updated_at 2021_12_14, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;)

References

cve	2021-44228

Metadata

attack targetServer

created at2021_12_14

cveCVE-2021-44228

deploymentInternal

confidenceHigh

signature severityMajor

tagCISA_KEV

updated at2021_12_14

mitre tactic idTA0001

mitre tactic nameInitial_Access

mitre technique idT1190

mitre technique nameExploit_Public_Facing_Application

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