""ET EXPLOIT Apache log4j RCE Attempt - lower/upper UDP Bypass M2 (CVE-2021-44228)""
SID: 2034701
Revision: 1
Class Type: attempted-admin
Metadata: attack_target Server, created_at 2021_12_14, cve CVE_2021_44228, deployment Perimeter, deployment Internal, signature_severity Major, tag Exploit, 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
Reference:
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cve
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2021-44228
Protocol: udp
Source Network: any
Source Port: any
Destination Network: [$HOME_NET,$HTTP_SERVERS]
Destination Port: any
Flow:
Contents:
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Value: "|24 7b|jndi|3a|"
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Value: "|3a 2f 2f|"
Within:
PCRE: "/^(l|r|d|\x24\x7b(lower|upper)\x3a(l|r|d)\x7d)(d|n|m|\x24\x7b(lower|upper)\x3a(d|n|m)\x7d)(a|i|s|\x24\x7b(lower|upper)\x3a(a|i|s)\x7d)(p|\x24\x7b(lower|upper)\x3a(p)\x7d)/Ri"
Special Options:
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nocase
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fast_pattern