alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Gulcrypt.B Downloading components - set"; flow:established,to_server; urilen:8; flowbits:set,ET.Gulcrypt; flowbits:noalert; http.method; content:"GET"; http.uri; content:"/manager"; fast_pattern; http.header_names; content:!"Referer|0d 0a|"; reference:md5,6c41449d6c3efd4c9f98374a0d132ff6; classtype:trojan-activity; sid:2020420; rev:4; metadata:created_at 2015_02_13, malware_family Win32_Gulcrypt_B, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_09_29;)