Versions (2)
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Rev: 1 • Sep 18, 2025, 12:00 PMET MALWARE FrigidBackdoor Exfil Zip
alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE FrigidBackdoor Exfil Zip"; flow:established,to_server; http.method; content:"POST"; http.uri; bsize:17; content:"/api/data/receive"; http.user_agent; content:"curl/"; startswith; http.header; content:"X-Bid: f48fbe39836779cadbf148b5952919fd"; fast_pattern; http.request_body; content:".zip"; reference:url,moonlock.com/macc-stealer-macsync-backdoor; classtype:trojan-activity; sid:2064777; rev:1; metadata:affected_product Mac_OSX, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2025_09_18, deployment Perimeter, confidence High, signature_severity Major, tag Backdoor, tag c2, tag Description_Generated_By_Proofpoint_Nexus, tag FrigidBackdoor, updated_at 2025_09_18, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)
Sep 18, 2025, 12:00 PM
Sep 18, 2025, 12:00 PM
Sep 18, 2025, 8:36 PM
Sep 19, 2025, 10:35 PM
rules/emerging-malware.rules