ET MALWARE Grizzly Loader Custom HTTP Header Observed (X-Panel-Callback)
Sourceet/open
Fileemerging-malware.rules
CreatedSeptember 1, 2026
UpdatedSeptember 1, 2026
Classificationtrojan-activity
alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Grizzly Loader Custom HTTP Header Observed (X-Panel-Callback)"; classtype:trojan-activity; sid:2071883; rev:1; metadata:affected_product Windows_Client, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2026_09_01, deployment Perimeter, deployment SSLDecrypt, malware_family GrizzlyLoader, confidence Medium, signature_severity Major, tag c2, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2026_09_01, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)
Detection details are hidden.
Metadata
affected productWindows_Client
attack targetClient_Endpoint
tls stateTLSDecrypt
created at2026_09_01
deploymentSSLDecrypt
malware familyGrizzlyLoader
confidenceMedium
signature severityMajor
tagDescription_Generated_By_Proofpoint_Nexus
updated at2026_09_01
mitre tactic idTA0011
mitre tactic nameCommand_And_Control
mitre technique idT1071
mitre technique nameApplication_Layer_Protocol
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