alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Asylum Ambuscade Related CnC Activity (GET) M2"; flow:established,to_server; urilen:5; http.method; content:"GET"; http.uri; content:"|2f 3f|www"; http.user_agent; content:"Mozilla|2f|5|2e|0|20 28|Windows|3b 20|U|3b 20|Windows|20|NT|20|10|2e|0|29 20|http|2f|2|2e|8|2e|11|20|Tcl|2f|8|2e|6|2e|7"; bsize:63; fast_pattern; http.host; pcre:"/^(?:[0-9]{1,3}\.){3}[0-9]{1,3}$/"; http.connection; content:"close"; http.accept; content:"|2a 2f 2a|"; http.accept_enc; content:"gzip|2c|deflate|2c|compress"; reference:url,welivesecurity.com/2023/06/08/asylum-ambuscade-crimeware-or-cyberespionage/; reference:url,proofpoint.com/us/blog/threat-insight/asylum-ambuscade-state-actor-uses-compromised-private-ukrainian-military-emails; classtype:trojan-activity; sid:2046244; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_06_13, deployment Perimeter, confidence High, signature_severity Critical, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_06_13;)