alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Asylum Ambuscade Related CnC Activity (GET) M1"; flow:established,to_server; urilen:15; http.method; content:"GET"; http.uri; pcre:"/^\/(?:[0-9]{10})\x2dds2$/"; content:"-ds2"; endswith; fast_pattern; http.user_agent; content:"AutoHotkey"; bsize:10; http.host; pcre:"/^(?:[0-9]{1,3}\.){3}[0-9]{1,3}$/"; http.header; content:"Cache-Control: no-cache|0d 0a|"; http.header_names; content:"|0d 0a|User-Agent|0d 0a|Host|0d 0a|Cache-Control|0d 0a 0d 0a|"; bsize:37; 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:2046243; 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 Medium, signature_severity Critical, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_06_13;)