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SID: 2064143 • Source: et/open

Versions (2)

Version DetailsCurrent

Rev: 1Aug 25, 2025, 12:00 PM

ET MALWARE KoiStealer Payload Reqeust

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE KoiStealer Payload Reqeust"; flow:established,to_server; http.method; content:"GET"; http.uri; pcre:"/\x2ephp\x3fver=\d{1,4}\x26type\x3d\d$/"; http.user_agent; content:"WindowsPowerShell"; fast_pattern; classtype:trojan-activity; sid:2064143; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state plaintext, created_at 2025_08_25, deployment Perimeter, malware_family KoiStealer, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_08_25, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1105, mitre_technique_name Ingress_Tool_Transfer; target:src_ip;)

Aug 25, 2025, 12:00 PM

Aug 25, 2025, 12:00 PM

Aug 25, 2025, 9:35 PM

Aug 26, 2025, 9:34 PM

rules/emerging-malware.rules