""ET EXPLOIT Apache log4j RCE Attempt - lower/upper TCP Bypass M1 (CVE-2021-44228)""
SID: 2034659
Revision: 2
Class Type: attempted-admin
Metadata: attack_target Server, created_at 2021_12_11, 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: tcp
Source Network: any
Source Port: any
Destination Network: [$HOME_NET,$HTTP_SERVERS]
Destination Port: any
Flow: established,to_server
Contents:
- Value: "%7bjndi%3a"
Within:
PCRE: "/^(l|r|d|(\x24|%24)(\x7b|%7b)(lower|upper)(\x3a|%3a)(l|r|d)(\x7d|%7d))(d|n|m|(\x24|%24)(\x7b|%24)(lower|upper)(\x3a|%3a)(d|n|m)(\x7d|%7d))(a|i|s|(\x24|%24)(\x7b|%7b)(lower|upper)(\x3a|%3a)(a|i|s)(\x7d|%7d))(p|(\x24|%24)(\x7b|%7b)(lower|upper)(\x3a|%3a)p(\x7d|%7d))/Ri"
Special Options:
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nocase
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fast_pattern