Rule History

SID: 2065647 • Source: et/open

Versions (2)

Version DetailsCurrent

Rev: 1 • Nov 4, 2025, 12:00 PM

Message:

ET MALWARE Observed Malicious Domain (significant-adopted-bearing-own .trycloudflare .com in TLS SNI)

Rule:

alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed Malicious Domain (significant-adopted-bearing-own .trycloudflare .com in TLS SNI)"; flow:established,to_server; tls.sni; bsize:49; content:"significant-adopted-bearing-own.trycloudflare.com"; fast_pattern; reference:md5,b24d144f391593cc76cc7cf14449c943; classtype:trojan-activity; sid:2065647; rev:1; metadata:attack_target Client_Endpoint, created_at 2025_11_04, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_11_04;)

Created:

Nov 4, 2025, 12:00 PM

Updated:

Nov 4, 2025, 12:00 PM

DB Created:

Nov 4, 2025, 10:34 PM

DB Updated:

Nov 5, 2025, 10:34 PM

Filename:

rules/emerging-malware.rules