alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Possible Raspberry Robin Activity (GET) M3"; flow:established,to_server; urilen:43; http.method; content:"GET"; http.uri; content:"/apps/Samples/thumb/sample"; startswith; fast_pattern; pcre:"/^(?:\d{2})\x2ejpg\x3f(?:\d{10})$/R"; http.referer; content:"/cgi-bin/"; endswith; http.accept; content:"image/png"; startswith; http.user_agent; content:"Mozilla|2f|5|2e|0|20 28|Windows|20|NT|20|6|2e|1|3b 20|Trident|2f|7|2e|0|3b 20|rv|3a|11|2e|0|29 20|like|20|Gecko"; bsize:61; reference:md5,d89c574b4afdaadfd345177dd8f5c177; classtype:trojan-activity; sid:2047013; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_08_01, deployment Perimeter, malware_family RaspberryRobin, confidence Low, signature_severity Critical, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_08_01;)