""ET EXPLOIT Possible Apache log4j RCE Attempt - 2021/12/13 Obfuscation Observed (tcp) (CVE-2021-44228)""
SID: 2034676
Revision: 1
Class Type: attempted-admin
Metadata: attack_target Server, created_at 2021_12_13, cve CVE_2021_44228, deployment Perimeter, deployment Internal, signature_severity Major, tag Exploit, 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
Reference:
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cve
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2021-44228
Protocol: tcp
Source Network: any
Source Port: any
Destination Network: [$HOME_NET,$HTTP_SERVERS]
Destination Port: any
Flow: established,to_server
Contents:
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Value: "|24 7b|"
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Value: "|3a|"
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Value: "|24 7b|env|3a|"
Within:
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"
Special Options: