Versions (3)
Version DetailsCurrent
Rev: 1 • Aug 4, 2021, 12:00 PMET MALWARE Observed Cobalt Strike CnC Domain (onlineworkercz .com in TLS SNI)
alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed Cobalt Strike CnC Domain (onlineworkercz .com in TLS SNI)"; flow:established,to_server; tls.sni; content:"onlineworkercz.com"; bsize:18; fast_pattern; reference:url,thedfirreport.com/2021/08/01/bazarcall-to-conti-ransomware-via-trickbot-and-cobalt-strike/; classtype:domain-c2; sid:2033668; rev:1; metadata:attack_target Client_Endpoint, created_at 2021_08_04, deployment Perimeter, malware_family Cobalt_Strike, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_08_04, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)
Aug 4, 2021, 12:00 PM
Aug 4, 2021, 12:00 PM
Sep 21, 2024, 3:00 AM
Sep 9, 2025, 9:34 PM
rules/emerging-malware.rules