Splunk Search for Detecting Log4J jndi Vulnerabilities (CVE-2021-44228) (Log4Shell) Copy
[ | tstats count where index=* AND punct IN ("*${*","*$%*") earliest=-7d latest=now by index, sourcetype | fields - count | format ] AND (((punct=*$* AND punct=*:*) OR (punct=*%*)) AND ("*${*" OR "*%24{*" OR "$%7B*" OR "*%24%7B*"") AND ("//" OR "%2F%2F" OR "/%2F" OR "%2F/") ) | eval decoded_raw = urldecode(_raw) | regex decoded_raw="\$\S*?{\S*?j[A-Za-z:\-\$[]]*?n[A-Za-z:\-\$[]]*?d[A-Za-z:\-\$[]]*?i[^\s\/]*//.*"
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Splunk Search for List of linux users who escalated privileges Copy
sourcetype=linux_secure "su: " OR "sudo: " | eval Date=strftime(_time, "%Y/%m/%d") | rex "\w{3}\s\d{2}\s\d{2}:\d{2}:\d{2}\s(?<hostname>\S+)" | regex _raw="\suser\sroot\sby" | rex "\suser\sroot\sby\s(?<user>\w+)" | stats count by user, host
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