alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET TROJAN Observed Malicious SSL Cert (ServHelper? CnC?)"; flow:from_server,established; tls_cert_subject; content:"CN=dsnnguyrygfu.xyz"; nocase; fast_pattern; isdataat:!1,relative; tls_cert_issuer; content:"C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3"; classtype:trojan-activity; sid:2029605; rev:1; metadata:attack_target Client_and_Server, created_at 2020_03_10, deployment Perimeter, former_category MALWARE, malware_family ServHelper?, performance_impact Low, signature_severity Major, tag SSL_Malicious_Cert, updated_at 2020_11_05, mitre_tactic_id TA0042, mitre_tactic_name Resource_Development, mitre_technique_id T1587, mitre_technique_name Develop_Capabilities;)

Added 2022-01-14 18:55:59 UTC

alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET TROJAN Observed Malicious SSL Cert (ServHelper? CnC?)"; flow:from_server,established; tls_cert_subject; content:"CN=dsnnguyrygfu.xyz"; nocase; fast_pattern; isdataat:!1,relative; tls_cert_issuer; content:"C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3"; classtype:trojan-activity; sid:2029605; rev:1; metadata:created_at 2020_03_10, former_category MALWARE, malware_family ServHelper?, tag SSL_Malicious_Cert, updated_at 2020_11_05;)

Added 2020-11-05 18:35:59 UTC

alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET TROJAN Observed Malicious SSL Cert (ServHelper? CnC?)"; flow:from_server,established; tls_cert_subject; content:"CN=dsnnguyrygfu.xyz"; nocase; fast_pattern; isdataat:!1,relative; tls_cert_issuer; content:"C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3"; classtype:trojan-activity; sid:2029605; rev:1; metadata:created_at 2020_03_10, former_category MALWARE, malware_family ServHelper?, tag SSL_Malicious_Cert, updated_at 2020_03_10;)

Added 2020-08-05 19:17:42 UTC

alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET TROJAN Observed Malicious SSL Cert (ServHelper? CnC?)"; flow:from_server,established; tls_cert_subject; content:"CN=dsnnguyrygfu.xyz"; nocase; fast_pattern; isdataat:!1,relative; tls_cert_issuer; content:"C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3"; metadata: former_category MALWARE; classtype:trojan-activity; sid:2029605; rev:1; metadata:tag SSL_Malicious_Cert, created_at 2020_03_10, malware_family ServHelper?, updated_at 2020_03_10;)

Added 2020-03-10 20:58:57 UTC

alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET TROJAN Observed Malicious SSL Cert (ServHelper? CnC?)"; flow:from_server,established; tls_cert_subject; content:"CN=dsnnguyrygfu.xyz"; nocase; fast_pattern; isdataat:!1,relative; tls_cert_issuer; content:"C=US, O=Let's Encrypt, CN=Let's Encrypt Authority X3"; metadata: former_category MALWARE; classtype:trojan-activity; sid:2029605; rev:1; metadata:tag SSL_Malicious_Cert, created_at 2020_03_10, malware_family ServHelper?, updated_at 2020_03_10;)

Added 2020-03-10 20:33:50 UTC