ET EXPLOIT Apache log4j RCE Attempt - 2021/12/13 Obfuscation Observed (tcp) (Outbound) (CVE-2021-44228)

SID: 2034836Rev: 25 views
History
Sourceet/open
CreatedDecember 18, 2021
UpdatedDecember 18, 2021
Classificationattempted-admin
alert tcp $HOME_NET any -> any any (msg:"ET EXPLOIT Apache log4j RCE Attempt - 2021/12/13 Obfuscation Observed (tcp) (Outbound) (CVE-2021-44228)"; flow:established,to_server; content:"%7b"; nocase; fast_pattern; pcre:"/^(j|(\x24|%24)(\x7b|%7b)(lower|upper)(\x3a|%3a)j(\x7d|%7d)|(\x24|%24)(\x7b|%7b)(\x3a|%3a){1,2}\-j(\x7d|%7d))(n|(\x24|%24)(\x7b|%7b)(lower|upper)(\x3a|%3a)n(\x7d|%7d)|(\x24|%24)(\x7b|%7b)(\x3a|%3a){1,2}\-n(\x7d|%7d))/Ri"; content:"|3a|"; distance:0; pcre:"/^(l|r|d|(\x24|%24)(\x7b|%7b)(lower|upper)(\x3a|%3a)(l|r|d)(\x7d|%7d)|(\x24|%24)(\x7b|%7b)(\x3a|%3a){1,2}\-(l|r|d)(\x7d|%7d))(d|n|m|(\x24|%24)(\x7b|%7b)(lower|upper)\x3a(d|n|m)(\x7d|%7d)|(\x24|%24)(\x7b|%7b)(\x3a|%3a){1,2}\-(d|n|m)(\x7d|%7d))(a|i|s|(\x24|%24)(\x7b|%7b)(lower|upper)(\x3a|%3a)(a|i|s)(\x7d|%7d)|(\x24|%24)(\x7b|%7b)(\x3a|%3a){1,2}\-(a|i|s)(\x7d|%7d))(p|(\x24|%24)(\x7b|%7b)(lower|upper)(\x3a|%3a)p(\x7d|%7d))/Ri"; reference:cve,2021-44228; classtype:attempted-admin; sid:2034836; rev:2; metadata:attack_target Server, created_at 2021_12_18, cve CVE_2021_44228, deployment Perimeter, deployment Internal, confidence High, signature_severity Major, tag Exploit, tag CISA_KEV, updated_at 2021_12_18, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;)

References

cve2021-44228

Metadata

attack targetServer
created at2021_12_18
deploymentInternal
confidenceHigh
signature severityMajor
tagCISA_KEV
updated at2021_12_18
mitre tactic idTA0001
mitre tactic nameInitial_Access
mitre technique idT1190
mitre technique nameExploit_Public_Facing_Application

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