alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Screenshotter Backdoor CnC Activity (GET)"; flow:established,to_server; urilen:15; http.method; content:"GET"; http.uri; content:"-ds2"; endswith; fast_pattern; pcre:"/^\/[0-9]{10}-ds2$/"; http.user_agent; bsize:10; content:"AutoHotkey"; http.header; header_lowercase; content:"cache-control|3a 20|no-cache"; http.header_names; to_lowercase; content:!"|0d 0a|referer|0d 0a|"; reference:url,twitter.com/Unit42_Intel/status/1608567622856998912; classtype:trojan-activity; sid:2043240; rev:4; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_01_09, deployment Perimeter, deployment SSLDecrypt, malware_family Win32_Screenshotter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_30, reviewed_at 2025_10_24;)