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Suricata Coverage for common Log4Shell Probes (CVE-2021-44228)
# Possible successful interactsh probe
alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"FOX-SRT - Webattack - Possible successful InteractSh probe observed"; flow:established, to_client; content:"200"; http_stat_code; content:"<html><head></head><body>"; http_server_body; fast_pattern; pcre:"/[a-z0-9]{30,36}<\/body><\/html>/QR"; threshold:type limit, track by_dst, count 1, seconds 3600; classtype:misc-attack; reference:url, github.com/projectdiscovery/interactsh; metadata:created_at 2021-12-05; metadata:ids suricata; priority:2; sid:21003712; rev:1;)
alert dns $HOME_NET any -> any 53 (msg:"FOX-SRT - Suspicious - DNS query for interactsh.com server observed"; flow:stateless; dns_query; content:".interactsh.com"; fast_pattern; pcre:"/[a-z0-9]{30,36}\.interactsh\.com/"; threshold:type limit, track by_src, count 1, seconds 3600; reference:url, github.com/projectdiscovery/interactsh; classtype:bad-unknown; metadata:created_at 2021-12-05; metadata:ids suricata; priority:2; sid:21003713; rev:1;)
# Detecting DNS queries for dnslog[.]cn
alert dns any any -> any 53 (msg:"FOX-SRT - Suspicious - dnslog.cn DNS Query Observed"; flow:stateless; dns_query; content:"dnslog.cn"; fast_pattern:only; threshold:type limit, track by_src, count 1, seconds 3600; classtype:bad-unknown; metadata:created_at 2021-12-10; metadata:ids suricata; priority:2; sid:21003729; rev:1;)
# Connections to requestbin.net
alert dns $HOME_NET any -> any 53 (msg:"FOX-SRT - Suspicious - requestbin.net DNS Query Observed"; flow:stateless; dns_query; content:"requestbin.net"; fast_pattern:only; threshold:type limit, track by_src, count 1, seconds 3600; classtype:bad-unknown; metadata:created_at 2021-11-23; metadata:ids suricata; sid:21003685; rev:1;)
alert tls $HOME_NET any -> $EXTERNAL_NET 443 (msg:"FOX-SRT - Suspicious - requestbin.net in SNI Observed"; flow:established, to_server; tls_sni; content:"requestbin.net"; fast_pattern:only; threshold:type limit, track by_src, count 1, seconds 3600; classtype:bad-unknown; metadata:created_at 2021-11-23; metadata:ids suricata; sid:21003686; rev:1;)
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