alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Likely Evil Macro EXE DL mar 28 2016"; flow:established,to_server; http.method; content:"HEAD"; http.uri; content:".exe"; http.user_agent; content:"Microsoft BITS/7.5"; fast_pattern; bsize:18; http.header_names; content:!"Referer|0d 0a|"; http.host; pcre:"/(?:xyz|pw)$/"; reference:md5,d599a63fac0640c21272099f39020fac; classtype:trojan-activity; sid:2022686; rev:5; metadata:created_at 2016_03_30, confidence Medium, signature_severity Major, updated_at 2020_06_30;)