""ET EXPLOIT Apache log4j RCE Attempt - lower/upper UDP Bypass M1 (Outbound) (CVE-2021-44228)""
SID: 2034782
Revision: 2
Class Type: attempted-admin
Metadata: attack_target Server, created_at 2021_12_17, cve CVE_2021_44228, deployment Perimeter, deployment Internal, signature_severity Major, tag Exploit, updated_at 2021_12_17, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application
Reference:
-
cve
-
2021-44228
Protocol: udp
Source Network: $HOME_NET
Source Port: any
Destination Network: any
Destination Port: any
Flow:
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|%7b)(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:
-
nocase
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fast_pattern