Versions (2)
Version DetailsCurrent
Rev: 1 • Aug 25, 2025, 12:00 PMET 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