Rule History

alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Send-Safe Bulk Mailer SSL Cert - Observed in Spam Campaigns"; flow:established,to_client; tls.cert_subject; content:"C=Unknown, ST=Unknown, L=Unknown, O=Send-Safe, OU=Unknown, CN=Send-Safe"; bsize:71; fast_pattern; reference:md5,837c7af7f376722a0315cb0a7cb12399; classtype:trojan-activity; sid:2022194; rev:3; metadata:attack_target Client_Endpoint, created_at 2015_11_30, deployment Perimeter, confidence High, signature_severity Major, tag SSL_Malicious_Cert, updated_at 2022_03_23;)