alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Win32/Gulcrypt.B Downloading components"; flow:established,from_server; flowbits:isset,ET.Gulcrypt; file_data; content:"MZ"; within:2; byte_jump:4,58,relative,little; content:"PE|00 00|"; distance:-64; within:4; reference:md5,6c41449d6c3efd4c9f98374a0d132ff6; classtype:trojan-activity; sid:2020421; rev:2; metadata:created_at 2015_02_13, malware_family Win32_Gulcrypt_B, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)