alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Possible MEME#4CHAN Exfil Activity"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/"; bsize:1; http.content_type; content:"application/x-www-form-urlencoded"; bsize:33; http.content_len; content:"5235"; bsize:4; fast_pattern; http.header_names; content:!"Referer|0d 0a|"; reference:url,securonix.com/blog/securonix-threat-labs-security-meme4chan-advisory/; reference:md5,df7148650d18ee87e9abe3abaa51e650; classtype:trojan-activity; sid:2046156; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_06_07, deployment Perimeter, malware_family Xworm, confidence Medium, signature_severity Major, tag MEME_4CHAN, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_06_07;)