Rule History

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Screenshotter Backdoor CnC Activity (GET)"; flow:to_server,established; urilen:15; http.method; content:"GET"; http.uri; content:"-ds2"; endswith; fast_pattern; pcre:"/^\/[0-9]{10}-ds2$/"; http.user_agent; content:"AutoHotkey"; bsize:10; http.header; content:"Cache|2d|Control|3a 20|no|2d|cache"; http.header_names; content:!"Referer"; reference:url,twitter.com/Unit42_Intel/status/1608567622856998912; classtype:trojan-activity; sid:2043240; rev:1; 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 2023_01_09, reviewed_at 2025_10_24;)