alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO Possible .jpg download by VBA macro (SET) M2"; flow:established,to_server; flowbits:set,ET.vba-jpg-dl; flowbits:noalert; http.method; content:"GET"; http.uri; content:".jpg"; http.header; content:"Accept|3a 20|*/*|0d 0a|Accept-Language|3a 20|en-us|0d 0a|Range|3a 20|"; content:"MSIE 7.0|3b 20|Windows NT"; fast_pattern; http.header_names; content:!"Referer|0d 0a|"; classtype:not-suspicious; sid:2022262; rev:6; metadata:created_at 2015_12_15, performance_impact Significant, confidence Low, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_28;)