ET MALWARE Observed Cobalt Strike CnC Domain (onlineworkercz .com in TLS SNI)
Sourceet/open
CreatedAugust 4, 2021
UpdatedAugust 4, 2021
Classificationdomain-c2
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;)
References
Metadata
attack targetClient_Endpoint
created at2021_08_04
deploymentPerimeter
malware familyCobalt_Strike
confidenceHigh
signature severityMajor
tagDescription_Generated_By_Proofpoint_Nexus
updated at2021_08_04
mitre tactic idTA0011
mitre tactic nameCommand_And_Control
mitre technique idT1071
mitre technique nameApplication_Layer_Protocol
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