alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO Possible .jpg download by VBA macro (SET) M1"; flow:established,to_server; flowbits:set,ET.vba-jpg-dl; flowbits:noalert; http.method; content:"GET"; http.uri; content:".jpg"; pcre:"/\.jpg(?:\?\d+)?$/"; http.header; content:"Accept|3a 20|*/*|0d 0a|Accept-Encoding|3a 20|gzip, deflate|0d 0a|User-Agent|3a 20|Mozilla/4.0 (compatible|3b 20|MSIE 7.0|3b 20|Windows NT"; depth:102; fast_pattern; http.header_names; content:!"Referer|0d 0a|"; content:!"Accept-Language|0d 0a|"; classtype:not-suspicious; sid:2022220; rev:4; metadata:created_at 2015_12_05, confidence Low, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_04_20;)