Rule History

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Vidar Variant/Mars CnC Activity (GET)"; flow:established,to_server; http.request_line; content:"GET /request HTTP/1.1"; bsize:21; fast_pattern; http.host; pcre:"/^(?:[0-9]{1,3}\.){3}[0-9]{1,3}$/"; http.header_names; content:"|0d 0a|Host|0d 0a|Cache-Control|0d 0a|Cookie|0d 0a 0d 0a|"; bsize:33; http.header; content:"|0d 0a|Cache-Control|3a 20|no-cache|0d 0a|"; http.cookie; content:"PHPSESSID="; startswith; pcre:"/^PHPSESSID=[a-z0-9]{26}$/C"; reference:md5,880924e5583978c615dd03ff89648093; reference:url,twitter.com/X__Junior/status/1528046444963323904; classtype:trojan-activity; sid:2036667; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_05_23, deployment Perimeter, malware_family Win32_Vidar, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_05_24, reviewed_at 2025_10_24;)