alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE DonotGroup Maldoc Activity (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; pcre:"/^\/[A-Za-z0-9]{16}\/[A-Za-z0-9]{16}\.php$/"; content:"/"; startswith; content:"/"; distance:16; within:1; content:".php"; distance:16; within:4; endswith; http.user_agent; content:"|3b 20|ms-office|3b 20|"; http.header_names; content:"|0d 0a|Accept|0d 0a|User-Agent|0d 0a|Accept-Encoding|0d 0a|Host|0d 0a|Connection|0d 0a 0d 0a|"; bsize:59; fast_pattern; reference:md5,5c45a038846aea315595b97b0a619f1a; reference:url,twitter.com/ShadowChasing1/status/1463498326481932289; reference:md5,67abe8b04f62eb55b6b880668fb8a634; classtype:trojan-activity; sid:2034545; rev:2; metadata:attack_target Client_Endpoint, created_at 2021_11_24, deployment Perimeter, malware_family DonotGroup, performance_impact Moderate, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_06_27;)