alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE ZeroLocker EXE Download"; flow:established,from_server; flowbits:isset,ET.http.binary; file_data; content:"|5c 50 72 6f 6a 65 63 74 73 5c 5a 65 72 6f 4c 6f 63 6b 65 72 5c|"; reference:url,securelist.com/blog/incidents/66135/zerolocker-wont-come-to-your-rescue/; reference:url,webroot.com/blog/2014/08/14/zero-locker/; reference:url,symantec.com/security_response/writeup.jsp?docid=2014-081521-4509-9; classtype:trojan-activity; sid:2018963; rev:2; metadata:created_at 2014_08_19, confidence High, signature_severity Major, updated_at 2019_07_26;)