alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Possible Malicious Macro EXE DL AlphaNumL"; flow:established,to_server; urilen:10<>40; http.uri; content:".exe"; fast_pattern; offset:5; pcre:"/\/(?=[0-9]*?[a-z]*?[a-z0-9)(?=[a-z0-9]*[0-9][a-z]*[0-9][a-z0-9]*\.exe)(?!setup\d+\.exe)[a-z0-9]{5,15}\.exe/"; http.header; strip_pseudo_headers; header_lowercase; content:"accept|3a 20 2a 2f 2a 0d 0a|"; startswith; http.host; content:!".bloomberg.com"; content:!"leg1.state.va.us"; content:!"7-zip.org"; content:!"virginia.gov"; http.user_agent; content:"Mozilla/4.0 (compatible|3b 20|MSIE 7.0|3b 20|Windows NT"; startswith; http.accept_enc; bsize:13; content:"gzip, deflate"; http.header_names; to_lowercase; content:!"|0d 0a|referer|0d 0a|"; classtype:trojan-activity; sid:2022566; rev:11; metadata:created_at 2016_02_26, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_05_04;)