alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE DonotGroup Maldoc Activity (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; pcre:"/^\/[A-Za-z0-9]{16}\/[A-Za-z0-9]{48}\.png$/"; content:"/"; startswith; content:"/"; distance:16; within:1; content:".png"; distance:48; within:4; endswith; fast_pattern; http.header_names; content:"|0d 0a|Accept|0d 0a|Accept-Encoding|0d 0a|User-Agent|0d 0a|Host|0d 0a|Connection|0d 0a 0d 0a|"; bsize:59; reference:md5,a8bf540809c461e6718fdea5145dabe4; reference:url,twitter.com/StopMalvertisin/status/1659156583715311617; classtype:trojan-activity; sid:2045778; rev:1; metadata:attack_target Client_Endpoint, created_at 2023_05_19, deployment Perimeter, performance_impact Significant, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_05_19; target:src_ip;)