alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Potential Dridex.Maldoc Minimal Executable Request"; flow:established,to_server; urilen:<40; http.method; content:"GET"; http.uri; content:".exe"; fast_pattern; pcre:"/\/[a-z0-9]+\/[a-z0-9]+\.exe$/i"; http.header; content:!"MstarUpdate"; http.user_agent; content:!"Mozilla/"; http.host; content:!".bitdefender.com"; content:!".homestead.com"; http.header_names; content:"|0d 0a|User-Agent|0d 0a|Host|0d 0a 0d 0a|"; depth:22; endswith; reference:md5,28208e19a528bfa95e5662e2d6f2e911; reference:url,blogs.cisco.com/security/dridex-attacks-target-corporate-accounting; classtype:trojan-activity; sid:2020826; rev:11; metadata:created_at 2015_04_01, performance_impact Moderate, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_08;)